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SCaN Acronyms
March 14, 2011

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Acronym Description
4GL Fourth Generation Language
4SW Fourth Support Wing
Acronym Description
A/D Analog/Digital
A/G Air to Ground
AA Associate Administrator
AAA Assistant Associate Administrator
AACB Aeronautics and Astronautics Coordinating Board
AAMU Alabama A&M University
AAW Actice Aeroelastic Wing
ABBE Adaptive Base Band Equalizer
ABS Advanced Business Systems
AC Accomplishment Criteria
AC Atmospheric Corrector
ACA Associate Contractor Agreement
ACC Access Control Center
ACCA Automatic Cloud Cover Assessment
ACE Advanced Composition Explorer
ACE Array Combining Experiment
ACISS Advisory Committee on the International Space Station
ACO Administrative Contracting Officer  
ACRIM Active Cavity Radiometer Irradiance Monitor
ACRIMSAT Active Cavity Radiometer Irradiance Monitor Satellite
ACRS Automated Conflict Resolution System
ACS Advanced Communications Services
ACS Attitude Control  Subsystem
ACTL Automated Compatibility Test Lab
ACTS Advanced Communication Technology Satellite
ACWP Actual Cost of Work Performed
ADD Architecture Definition Document
ADEOS Advanced Earth Observation Satellite
ADP Architecture Decision Point
ADP Automated Data Processing
ADPE Automated Data Processing Equipment
ADS Action Document Summary
ADS Advisory and Directive System
AE Ascent/Entry
AEHF Advanced Extremely High Frequency
AEMC Advanced Environmental Monitoring and Control
AEP Agency Execution Plan
AEROnet Aeronautics Network
AERT net Aeronautics Network
AES Advanced Exploration Systems
AEVA Advanced Extra Vehicular Activitiy
AF Air Force
AF Award Fee
AFB Air Force Base
AFFTC Air Force Flight Test Center
AFL Astrobiology Field Lab
AFNW Available for new work
AFPS Automated Forms Processing System
AFRC Armstrong Flight Research Center
AFS Andrew File System
AFSCF Air Force Satellite Control Facility
AFSCN Air Force Satellite Control Network
AFSPC Air Force Space Programs Command
AFSS Autonomous Flight Safety System
AGILE Astro-rivelatore Gamma a Immagini Leggero
AGL Above Ground Level
AGNS Automated Ground Network System
AGO Santiago, Chile Tracking Station
AGS Autonomus Ground Station
AGU American Geophysical Union
AI Action Item
AI Artificial Intelligence
AIAA American Institute of Aeronautics and Astronautics
AIM Aeronomy of Ice in the Mesosphere 
AIS Automated Information Security
AISS Automated Information System Security
AIT Analysis and Integration Team
AK Alaska
ALI Advance Land Imager
ALOS Advanced Land Observing Satellite 
ALS Advanced Life Support
Alt-LASER Altimeter-Laser
Alt-RADAR Altimeter Radar
ALTV Approach & Landing Test Vehicle
AM Amplitude Modulation
AM Ante Meridiem
AM&O Agency Management and Operations
AMAO Advanced Mission Analysis Office
AMC Access Management Center
AMMI Asset Management /Maintenance Improvement 
AMMOS Advanced Multi-Mission Operations System
AMOS Automated Mission Operations System
AMPM Agency Mission Planning Model
AMPM Agency Planning Manifeset
AMPTS Automated Mission and Payload Tracking System
AMS Administrative Messaging System
AMS Antenna Management System
AMS Automated Messaging System
AMSR Advanced Microwave Scanning Radiometer
AMSR-E Advanced Microwave Scanning Radiometer for EOS
AMSU Advanced Microwave Sounding Unit
ANCC Alternate Network Control Center
ANI Automatic Number Identification
ANL Argonne National Laboratory
ANSI American National Standards Institute
ANT IFL Antenna Interfacilit Link
AO Announcement of Opportunity
AOA Abort Once Around
AOCS Attitude and Orbital Control System
AOCSM Alternate Organization Computer Security Manager
AOPNS Activity and Outage Posting Notification System
AOR Atlantic Ocean Region
AOS Acquisition of Signal
AOS Advanced Orbiting System
AP Application Processor
APA Allowance for Program Adjustments
APA Antenna Pointing Assembly
APD Avalanche Photo Diode 
APEX Advanced Photovoltaic and Electronic Experiment
APG Annual Performance Goal
API Application Program Interface
APID Application Process Identifier
APL Applied Physics Lab
APL Average Picture Level
APM Attached Pressurized Module
APMC Agency Program Management Council
APMM Agency Planning Mission Model
APOCC Automated Project Operations Control Center
APP Annual Performance Planning
AQUA Earth Observing System Afternoon
AR Anomaly Report
AR Avionics Ring
ARC Ames Research Center
ARD Atmospheric Reentry Demonstrator
ARIA Advanced Range Instrumentation Aircraft
ARIANE (French launch vehicle)
ARISS Amateur Radio on International Space Station
ARM Atmoshperic Radiation Measurement
ARMD Aeronautics Research Mission Directorate
ARRA American Recovery and Reinvestment Act
ASA Austrian Space Agency
ASAR Advanced Synthetic Aperture Radar 
ASCA Advanced Spacecraft for Cosmology Astrophsics
ASCII American Standard Code for Information Interchange
ASF Alaska Satellite Facility
ASI Agenzia Spaziale Italiana (Italian Space Agency)
ASIC Application Specific Integrated Circuit
ASL Above Sea Level
ASM Attached Sync Marker
ASMS Antenna Simulator and Modeling System
ASO Administrator Staff Office
ASO Astronomical Search for Origins
ASO Australian Space Office
ASP Acquisition Strategy Planning
ASP Attached Shuttle Payload
ASPC Attached Shuttle Payload Center
ASQC American Society for Quality Control
ASRC Arctic Slope Regional Corporation
ASRS Automated Support Requirements System
ASSET AMAO Studues Support Evaluation Tool
AST Aerospace Technology
ASTER Advanced Spaceborne Thermal Emission and Reflection Radiometer
ASTEX Atlantic Stratocumulus Transition Experiment  
ASTRO Astrophysics Space Observatory
AT Aeronautics Technology
AT&T American Telephone & Telegraph
ATCP Absolute Command Processor
ATDnet Advanced Technology Demonstration Network
ATE Automatic Test Equipment
ATF Australian Tracking Facility
ATM Asynchronous Transfer Mode
ATP Acceptance Test Plan
ATP Authority to Proceed
ATR Auto Track Reciever
ATS Applications Technology Satellite
ATS Automated Tracking Station
ATSC AlliedSignal Technical Services Corporation
ATV Automated Transfer Vehicle
ATXS ATM Transmission System
AU Astronomical Unit
Autodin Automated Data Network
AVHRR Advanced Very High Resolution Radiometer  
AVSTC Apple Valley Science and Technology Center
AWCS Agency Wide Coding Structure
AWG Acquisition Working Group
AWOTS Automated Wallops Orbital Tracking Station
AXAF Advanced X-ray Astrophysics Facility
AXAF-I Advanced X-ray Astrophysics Facility-Imager
Acronym Description
B&P Bid and Proposal
b/s Bits per Second
BAFM Business Administration and Financial Management
BAFO Best and Final Offer
BAFR Business Analysis and Financial Reporting
BARS Baseline Accounting Reporting System
BAS Basic Accounting System
BBA Baseband Assembly
BBN Broadband Network
BBS Bulletin Board System
BCC Backup Control Center
BCDS Broadband Communications Distribution System
BCR Baseline Change Request
BCWP Budgeted Cost of Work Performed
BCWS Budget Cost of Work Scheduled
BDA Bermuda (call sign for Bermuda Ground Network Tracking Station)
BDS Baseline Data System
BEO Beyond Earth Orbit
BER Bit Error Rate
BERTS Bit Error Rate Test Set
BFA Business Forecasting and Analysis
BFS Backup Flight Software
BIP Budget Input Process
BIS Bureau of Industry and Security
BISyB Business Information System Building Blocks
Bldg Building
BLDR Boulder
BMDO Ballistic Missile Defense Organization
BMG Beam Wave Guide
BMO Business Management Office
BNL Brookhaven National Laboratory
BNSC British National Space Centre
BOC Base Operations Contract
BOD Board of Directors
BOE Basis of Estimate
BOF Birds of a Feather
BOL Beginning of Life
BOSS Business Operations Support Subsystem
BPA Baseband Processing Assembly
BPGT Blossom Point Ground Terminal
BPO Bioastronautics Program Office
BPR Baseline Performance Review
BPR Biological and Physical Research
BPRS Blossom Point Remote Station
bps Bits Per Second
BPSK Binary Phase Shift Key (keyed or keying)
BR Bioastronautics Research
BRC Block Recording Computer
BRI Basic Rate Interface
BRIC Budget and Resource Management Information Center
BRML Block Recording Mission Log
BRS Block Recording System
BRT Business and Restricted Technology
BRTS Bilateral Ranging Transponder System
BRTSA Bilateral Ranging Transponder System Enhancement
BRU Block Recording Unit
BSR Biological Sciences Research
BSR Bit Slippage Rate
BSRN Baseline Surface Radiation Network
BSU Bowie State University
BVR Block V Receiver
BW Bandwidth
BWG Beam Wave Guide
Acronym Description
C&N Communications and Navigation
C&T Communications and Tracking
C&TCS Communications and Tracking Checkout System
C&W Caution and Warning
C/N Carrier-to-Noise Ratio
C/No Carrier Power-to-Noise Spectral Density Ratio
C/NOFS Communications/Navigation Outage Forecasting System
C3I Command, Control, Communications and Information
C4 Command, Control, Communication Computers
CA California
CA Computer Associates
CAAS Contract Administration and Audit Services
CAD Center Assistant to the Director
CAD Computer-Aided Design
CAD Computer-Aided Dispatch
CAD Computer-Aided Drawing
CAIB Columbia Accident Investigation Board
Cal Tech California Institute of Technology
CALIPSO Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observation
CaLV Cargo Launch Vehicle
CAM Centrifuge Accommodation Module
CAM Computer-Aided Manufacturing
CAM Control Account Managers
CAN Call sign for Canberra, Australia Ground Network Tracking Station
CANDOS Communications and Navigation Demonstration on Shuttle
CAP Competitive Access Provider
CAP Control Account Plan
CAP Corrective Action Plan
CAPS Comet/Asteroid Protection System
CAR Cloud Absorption Radiometer
CAR Corrective Action Request
CARD Constellation Architecture Requirements Document
CARDS Computer-Aided Recording and Display System
CART Cloud and Radiation Testbed  
CAS Calibrated Ancillary System
CAS Cost Accounting Standards
CAS Coverage Analysis System
CASP Cross Agency Support Programs
CASSINI Cooperative Mission to Saturn
CAST Chinese Academy of Space Technology
CAT Corrective Action Team
CATM&E Catalog Maintenance & Enhancement
CATSAT Cooperative Astrophysics And Technology Satellite
CB Control Board
CBA Collective Bargaining Agreements
CBJ Congressional Budget Justification
CBTA Computer Based Training Area
CC Cluster Controller
CC Common Carrier
CC Configuration Control
CC Convolutional Coding
CCAFS Cape Canaveral Air Force Station
CCAS Cape Canaveral Air Station
CCAS Contractor Cost Accrual System
CCB Configuration Control Board
CCC Concurrent Computer Corporation
CCC Control Center Complex
CCCM Center Customer Commitment Manager
CCDS Customer Cost Distribution System
CCDTS Common Carrier Domestic Satellite Transponder Service
CCF Consolidated Communications Facility
CCGSE Carrier/Customer Ground Support Equipment
CCITT Consultative Committee for International Telephone and Telegraph
CCL Closed-circuit loop
CCM Customer Commitment Manager
CCO Contract Change Order  
CCO Customer Commitment Office
CCOM Control Center Operations Manager
CCS Communications and Control Segment
CCS Communications and Control System
CCS Complex Control Sets
CCS Configuration and Control Segment
CCSA Common Control Switching Arrangement
CCSDS Consultative Committee for Space Data Systems
CCSR Communications and Control Segment Replacement
CCT Central Communications Terminal
CCTC Closed-Circuit Television
CCTV Closed-Circuit Television
CD Central Data
CD Compact Disk
CD&SC Central Distribution and Switching Center
CD&SC Communications Distribution and Switching Centers
CDA Command  and Data Acquisition
CDAF Central Data Acquisition Facility
CDC Control Data Corporation
CDCN Control and Display Computer Network
CDDT Countdown Demonstration Test
CDE Consolidated Development Environment
CDF Communications Data Formatter
CDHF Central Data Handling Facility
CDL Controlled Documents List
CDMA Code Division Multiple Access
CDR Central Data Recording
CDR Conceptual Design Review
CDR Critical Design Review
CDS Control Data Systems
CDSCC Canberra Deep Space Communications Complex
CE Chief Engineer
CE Current Expendable
CE&R Concept Evaluation and Refinement
CEA Center Export Administrator
CENBUD Central Budget System
CEOS Committee on Earth Observation Satellites
CEPEX Central Equatorial Pacific Experiment
CERES Clouds and the Earth's Radiant Energy System  
CESG CCSDS Engineering Steering Group
CEV Crew Exploration Vehicle
CEVP Countermeasure Evaluation and Validation Project
CF Central Facility
CFC Chlorofluorocarbons
CFD Central Flight Dynamics (Subsystem)
CFD Computational Fluid Dynamics
CFDP CCSDS File Delivery Protocol
CFIT Controlled Flight Into Terrain
CFLOS Cloud-free-line-of-sight
CFO Chief Financial Officer
CFR Code of Federal Regulations
CGBA Commercial Generic Bioprocessing Apparatus
CGI Common Gateway Interface
CGRO Compton Gamma Ray Observatory
CGS Columbus Ground System
CHAMP Comet Halley Active Monitoring Program
CHEM Chemistry
CHIPS Cosmic Hot Interstellar Spectrometer
CHIPSat Cosmic Hot Interstellar Plasma Spectrometer
CHIRPS Computer Hardware Inventory and Repair Processing System
CHS Crew Health and Safety
CI Composite (Performance) Index
CI Configuration Item
CIC Capital Investment Council
CIC CSOC Integration Center
CICA Competition in Contracting Act
CIEF Carrier Independent Exchange Facility
CIF Central Instrumentation Facility
CIM Customer Interface Management
CIMS Calibration Information Management System
CIO Chief Information Officer
CIP Change Information Page
CIP International Communications and Information Policy
CIS Center Information System
CITE Cargo Integrated Test Equipment
CITEL Inter-American Telecommunications Commission
CL Confidence Level
CL Contractor Leased
CLASS Communications Link Analysis and Simulation System
CLCL Checkout and Launch Control System
CLCN Commercial Lunar Communication and Navigation
CLCS Checkout and Launch Control System
CLCS Consolidated Launch Control System
CLF Central Logistics Facility
CLF Consolidated Logistics Facility
CLIPS C Language Integrated Production System
CLMP Coding Modulation Link Protocol
CLTU Command Link Transmission Unit
CLV Crew Launch Vehicle
CM Command Module
CM Configuration Management
CM Crew Module
CM Current Month
CM&O Center Management & Operations
CM&S Communications Maintenance and Storage
CMA China Meteorological Administration
CMA Command Modulator Assembly
CMC Center Management Council
CMC Complex Monitor and Control
CMD Command
CMF Command Management Facility 
CMF Complex Maintenance Facility 
CMF Consolidated Maintenance Facility
CMLP Coding, Modulation, and Link Protocol
CMO Configuration Management Office
CMP Configuration Management Plan
CMS CDAF Matrix Switch 
CMS Command Management System
CMS Command Matrix Switch 
CMSM Center Mission Services Manager
CNES Centre National d'Etudes Spatiales (National Space Study Center -France)
CNMOS Consolidated Network and Mission Operations Support
CNSI Classified National Security Information
CO Contracting Officer
COADS Comprehensive Ocean and Atmosphere Data Set
COARE Coupled Ocean-Atmosphere Response Experiment  
COBE Cosmic Background Explorer
COD Center Operations Directorate
Code M Office of Space Flight
Code R Office of Aerospace Technology
Code S Office of Space Science
Code U Office of Biological and Physical Research
Code Y Office of Earth Science
COF Columbus Orbital Facility
CoF Construction of Facilities
COFR Certificate of Flight Readiness
COGS Cost Estimating Module for Mission Operations and Ground Data Systems
COLA Collision Avoidance
COM Ccommon Run Time Environment
COMETS (U.S. name for Kaheliashi mission)
COMM Communications
COMSEC Communications Security
CoNNeCT Communications, Navigation, and Networking re-Configurable Testbed
ConOps Concept of Operations
CONS Connection Oriented Network Service
CONTOUR Comet Nucleus Tour
COOP Continuity of Operations Plan
COR Computer Operations Room
COR Contracting Officer's Representative (formerly COTR)
CORBA Common Object Request Broker Architecture
CORF Committee on Radio Frequency
CORIS Code O Requirements Information System
CoSI Commercial Satellite Communications Innovation
COSPAS Space System for the Search of Vessels in Distress (Cosmicheskaya Sistyema Poiska Avariynich Sudov - Russian)
COSTR Collaborative Solar-Terrestrial Research
COTR Contracting Officer's Technical Representative
COTS Commercial Off-the-Shelf
COTS Commercial Orbital Transportation System
CPA Command Processor Assembly
CPE Change Package Engineer
CPE Customer-provided equipment
CPEOC Community Partners Emergency Operations Center
CPF Calibration Parameter File
CPI Cost Performance Index
CPIF Cost Plus Incentive Fee
CPP Capacity Projection Plan
CPR Cardio Pulmonary Resuscitation
CPU Central Processing Unit
CR Change Request
CR Compliance Review
CRADA Cooperative Research and Development Agreements
CRAM Communications Routing and Metering
CRC Communications Research Centre (Canada)
CRC Cyclic Redundancy Check
CRC Cyclical Redundancy Code
CRCM Combined Radiometric Correction Model
CRF Communications Resource Facility
CRL Communications Research Laboratory (Japan)
CRL Countermeasure Readiness Level
CRM Continuous Risk Management
CRT Cathode-Ray Tube
CS Constellation Systems
CS Critical System
CS Customer Service
CSA Canadian Space Agency
CSC Computer Sciences Corporation
CSCI Computer Software Configuration Item
CSCS Central Security Control System
CSD Commercial Spaceflight Development
CSDL Combined Systems Development Lab
CSEA Commercial Spectrum Enhancement Act
CSF Central Service Facilities
CSI Cost Savings Initiative
CSIR Council for Scientific and Industrial Research (South Africa)
CSIRO Commonwealth Scientific and Industrial Research Organisation (Australia)
CSIRT Computer Security Incident Response Team
CSLA Contract Service Level Agreement
CSLE Civil Service Labor and Expenses
CSM Customer Satisfaction Metrics
CSMAC Communication System Monitor and Control
CSO Chief S&MA Officer
CSO Communication Service Office
CSOC Consolidated Space Operations Contract  
CSP Cost Savings Profile
CSR Customer Service Representative
CSRM Coordination Status Review Meeting
CSS Communications Services Section
CSS Control and Status System
CSS Cross Support Services
CSTC Consolidated Space Test Center
CSTL Communications, Standards and Testing Lab
CSTS Cross Support Transfer Service
CSU Channel Service Unit
CT Compatibility Testing
CT Crawler Transporter
CTA Centro Tecnico Aeroespacial (Brazil)
CTCU Central Telemetry and Command Unit
CTFS Common Time and Frequency System
CTL Compatibility Test Laboratory
CTM Center Technology Manager
CTM Control, Test and Monitor
CTN Commercial Technology Network 
CTN Communications and Tracking Network
CTOCC Consolidated TDRSS Operations Control Center
CTQ Critical to Quality
CTS Center Telecommunications System
CTS Compatibility Test Set
CTT Compatibility Test Trailer
CTV Compatibility Test Van
CTV Crew Transfer Vehicle
CU Configuration Unit
CU Control Unit
CV Cost Variance
CVTS Compressed Video Teleconferencing Service
CW Carrier Wave
CWBS Contract Work Breakdown Structure
CWI Common Work Instruction
Cx Constellation
CxCB Constellation Control Board
CxDVS Constellation Dissimilar Voice Switch
CxP Constellation Program
CxPO Constellation Program Office
CY Calendar Year
Acronym Description
D-to-O Development-to-Operations
D\A Digital to Analog
DA Data Administrator
DA Decision Authority
DAA Deputy Associate Administrator
DAAC Distributed Active Archive Center
DADS Data Archive and Distribution System
DAEP DSN Aperture Enhancement Project
DAF Data Analysis Facility
DAF Data Archive Facility
DARN Dual Auroral Radar Network
DARPA Defense Advanced Research Projects Agency
DAS Demand Access Service
DAS Demand Access System
DASD Direct Access Storage Device
DASS Distress Alerting Satellite System
Datacom Data Communications
DATE INIT. Date Initiated  
dB decibel
dBHz Decibels relative to 1Hz
dBi decibels referenced to an isotropic radiator
dBK Decibels referenced to one Kelvin
dBm Decibels referenced to one milliwatt
DBMS Data Base Management System
dBW Decibels referenced to one watt
dBWi Decibels referenced to one watt isotropically radiated power
DC Differential Corrections
DC District of Columbia
DCAA Defense Contract Auditing Agency
DCC Document Control Custodian
DCE Distributed Computing Environment
DCF Data Capture Facility
DCMA Defense Contract Management Agency
DCN Document Change Notice
DCN Document Control Number
DCNSS Data Center Network and Security Service
DCR Document Change Request
DCS Digital cross-connect system
DDC Direct Digital Control
DDCS Data Distribution and Command System
DDCS Document and Data Control System
DDDS Data Distribution Data Services
DDF Data Distribution Facility
DDOR Delta Differential One Way Ranging tones
DDST Decision Database Support Tools
DDT&E Design, Development, Test, and Evaluation
DEC Digital Equipment Corporation
DECnet Digital Equipment Corporation Network
DEG degree
DEL Data Evaluation Laboratory
Delta-DOR Delta-Differential One-way Range
Demod Demodulator
DEMOS Distributed Earth Model Orbital System
DEN DTN Experimental Network
DES Data Encryption Standard
DES Data Enhancement System
DES Distributed Evaluation System
DESCANO Deep Space Communications and Navigation Systems
DESDynl Deformation, Ecosystem Structure, and Dynamics of Ice
DFCB Data Format Control Book
DFCD Data Format Control Document
DFE Direct from Earth
DFI Developmental Flight Information
DFS Distributed File System
DG Data Group
DGPS Differential-Global-Positioning-System
DGT DSCC Galileo Telemetry Subsystem
DHS Department of Homeland Security
DI Data Item
DIF Data Interface Facility
DIN Deep Impact Networking
DINET Deep Impact Network Experiment Testbed
DIS Data Interface Subsystem 
DIS Data Interface System
DISCOVERY Class of Planetary Exploration Missions
DIT Development Integration Testing
DIXI Deep Impact Extended Investigation
DL Discipline Lead
DLF DSN Logistics Facility
DLR Designs Loads Report
DLR Deutschen Zentrum fur Luft- und Raumfahrt (Aerospace Research Center and Space Agency - Germany)
DM Data Management
DMAIC Define Measure Analyze Improve Control
DMC DSCC Monitor and Control
DMD DSCC Media Data
DMO data Management Office
DMR Detailed Mission Requirements
DMSP Defense Meteorological Satellite Program
DNS Director of Network Services
DNS Domain Name Servers
DO Delivery Order
DOC Data Operations Center
DOC Data Operations Control
DOC Department of Commerce
DOCS Data Operations Control System
DOD Department of Defense
DODISS Department of Defense Index of Specifications and Standards
DOE Department of Energy
DOL Day of Launch
DOLILU Day-of-Launch Initialization-Load Updates
DOMSAT Domestic Satellite
DOS Daily Operations Summary
DOS Department of State
DOS Disk Operating System
DOT Deep Space Optical Communications Terminal
DOT Department of Transportation
DP Destination Point
DP Digital Processing
DPAF Dual Payload Attach Fitting
DPAS Defense Priorities and Allocation System
DPM Deputy Program Manager
DPMC Directorate Program Management Council
DPMR Deputy Project Manager for Resources
DPO Deep Space Network Program Office
DPS Data Processing System
DR Deputy of Resources
DR Discrepancy Report
DRC Data Reduction Center
DRD Data Requirements Document
DRF Data Requirements Form
DRL Data Requirements List
DRM Design Reference Mission
DRS Discrepancy Reporting System
DRT Disaster Recovery Terminal
DRTS Data Relay and Tracking Satellite 
DRVID Differenced Range Versus Integrated Doppler
DRW Drawing
DS Deep Space
DS-T Deep Space Terminal
DSA Demodulator Synchronizer Assembly
DSAC Deep Space Atomic Clock
DSC Desktop Support Contractor
DSCC Deep Space Communications Complex
DSE Deep Space Element
DSH Deep Space Habitat
DSM Data Services Manager
DSMC Data Services Management Center
DSMC Data Services Management Complex
DSMS Deep Space Mission Systems
DSN Deep Space Network
DSN-GCS Deep Space Network - Ground Communications System
DSO Director, Space Operations
DSOT Data Systems Operations Team
DSOT Deep Space Operations Team
DSP Digital Signal Processor (Processing)
DSP Director of Systems Planning
DSP DSS Spectral Processor
DSPE Deep Space Planetary Explorer
DSR Deep Space Robotics
DSRI Danish National Space Center
DSS Data Storage System 
DSS Deep Space Station
DSS Deep Space Station
DSS Destination Surface Systems
DSTD Data Systems Technology Division
DSTL Data Systems Technology Laboratory
DSU Digital Service Unit
DSWG Data Standards Working Group
DT & T Development Test and Training
DTD Data Transfer Device
DTE Data Terminal Equipment
DTE Direct to Earth
DTF Design & Test Facility
DTF Development Test Facility
DTF DSN Testing Facility
DTK DSSC Tracking
DTM Deputy Technology Manager
DTM DSCC Telemetry
DTMF Dual Tone Multifrequency
DTN Delay Tolerant Networks
DTN Disruption Tolerant Networking
DTS Digital Test Set
DTS Distributed Teleconferencing System
DTS DSS Telemtry Simulator (JPL)
DU Dobson Unit
DUCAC Develop, Use and Commercialize Aerospace Capabilities
DV Dissimilar Voice
DVIS Digital Voice Information System
DVIS Digital Voice Intercommunications System
DXI Data Exchange Interface
Acronym Description
E-M L2 Earth–Moon LaGrange Orbit 2
E-mail Electronic Mail
E-S Earth-to-Space
E-S L1 Earth – Sun LaGrange 1
E-S L2 Earth – Sun LaGrange 2
EAC Estimate at Completion
EAEO Equal Access End Office
EAFB Edwards Air Force Base
EAP Educator Astronaut Program
EAR Export Administration Act
EARD Exploration Architecture Requirements Document
EAW Engineering Analysis Workstation
Eb/No Energy per Bit-To-Noise Power Spectral Density Ratio
EBGS Earth Based Ground Systems
EBnet EOS Backbone Network
EBnet EOSDIS Backbone Network
EBRE Earth-Based Relay Element
EC Emergency Communications
ECANS Exploration Communications and Navigation Systems 
ECC Emergency Control Center
ECC Encore Computer Corporation
ECF Engineering Computer Facility
ECM Engineering Change Management
ECN Engineering Change Notice
ECOMM Early Communications
ECP Engineering Change Proposal
ECS EOF Core System
ECS EOSDIS Core System
EDAC Error Detection and Correction
EDC EROS Data Center
EDL Entry Descent and Landing
EDOC EOS Data Operations Center
EDOS EOS Data Operations System
EDP Electronic Data Processing
EDS Earth Departure Stage
EDS Earth Departure Station
EDS Edit and Decommutation System
EDT Eastern Daylight Time
EDU Engineering Development Unit
EEB Bureau of Economic, Energy and Business Affairs
EECl Effective Equivalent Chlorine
EEFOV Extended Elliptical Field of View
EELV Evolved Expendable Launch Vehicle
EESS Earth Exploration Satellite Service
EET End-to-End Test
EF Extended Facility
EFF Efficiency
EFOV Extended Field of View
EGT EOSDIS Ground Terminal
EHS Enhanced HOSC System
EIA Electronic Industries Association
EIRP Effective Isotropic Radiated Power
EIS Enterprise Information System
ELC Express Logistics Carrier 
ELF Extremely Low Frequency
ELT Emergency Locator Transmitter
ELV Expendable Launch Vehicle
EM Electromagnetic
Email Electronic Mail
EMC Electromagnetic  Conductance
EMC Electromagnetic Compatibility
EMC Element Multiplexer/Correlators
EMCC Emergency Mission Control Center
EMCS Energy Managment Control System
EMCS Enhanced Mission Communication System
EMI Electromagnetic Interference
EMO Engineering Management Office
EMS Emergency Medical Services
EMT Emergency Medical Technology
ENCAP Encapsulation
ENG Electronic News Gathering Service
ENOC Emergency Network Operations Center
Envisat (European environmental satellite)
EO Earth Observer (OES New Millenium Missions)
EO Earth Orbiter
EO Engineering Office
EO-1 Earth Orbiter - 1
EOC Emergency Operations Center
EOCC Emergency Operations Control Center
EOF Experimenter's Operations Facility
EOM End of Mission
EOMS Earth Orbiting Multimission Services
EOPO Equal Opportunities Program Office
EOR Earth Orbit Rendezvous
EOS Earth Observation Satellite
EOS Earth Observing System
EOS-AM-1 Earth Observing System (Morning)
EOS-CHEM Earth Observing System (Chemistry)
EOSDIS Earth Observation Satellite Data Information System
EOSDIS Earth Observing System Data Information System
EOSP Earth Observing Scanning Polarimeter  
EOSP Electronic Only Support Plan
EOWG EOS Operations Working Group
EP Education Programs
EP Equivalent Person
EPA Environmental Protection Agency
EPCRA Emergency Planning and Community Right-to-know Act
EPGN EOS Polar Ground Network
EPGS Earth Observation System Polar Ground System
EPGS EOS Polar Ground Station
EPGSS Earth Observing System Polar Ground Station Service
EPIRB Emergency Position-Indicating Radio Beacon
EPOC Emergency Project Operations Center
EPOCH Extrasolar Planet Observations and Characterization
EPR Engineering Peer Review
EPS Electrical Power Subsystem
EPS Emergency Planning Subcommittee (under the IRAC)
Equip Equipment
ER Eastern Range
ER Equipment Room
ERAST Environmental Research Aircraft & Sensor Technology
ERB Engineering Review Board
ERBE Earth Radiation Budget Experiment
ERBS Earth Radiation Budget Satellite
ERCB Engineering Review Change Board
EROS Earth Resource Observation System
ERP Engineering Review Panel
ERPS EOS Real-Time Processing System
ERR Engineering Review Report
ERS European Space Agency Remote Satellite
ERT Emergency Response Team
ES&A Engineering Studies and Analyses
ESA Earth Science Applications
ESA European Space Agency
ESAS Exploration Systems Architecture Study
ESC Electronic Systems Command
ESC Executive Safety Committee
ESCG Engineering and Science Contract Group
ESDIS Earth Science Data Information System
ESE Earth Science Enterprise
ESG Executive Steering Group
ESM Earth Systematic Mission
ESMC Eastern Space & Missile Center
ESMD Earth Science Mission Directorate
ESMD Exploration Systems Mission Directorate
ESMS Earth Science Multi-Mission Services
ESnet Department of Energy Science Network
ESRT Exploration Systems Research and Technology
ESS Earth System Science
ESS Engineering Support Systems
ESSP Earth System Science Pathfinder
EST Eastern Standard Time
EST. NTE Value Estimated Not To Exceed Value  
ESTIF Extended Software Test and Integration Facility
ESTL Electronic Systems Test Laboratory
ESTRACK ESA Tracking Network
ETC Estimate-to-Complete
ETDP Exploration Technology Development Program
ETDS Enhanced Telemetry Display System
ETE End-to-End
ETGT Extended TDRSS Ground Terminal
ETR Eastern Test Range
ETS Engineering Technology Satellite
ETS Engineering Test Satellite
ETS EOSDIS Test System
EU Expected Utility
EUMETSAT European Organization for the Exploitation of Meteorological Satellites
EUROPA Orbiter To Jupiter
EUTELSAT European Telecommunications Satellite
EUTELSATO  European Telecommunications Satellite Organization
EUVE Extreme Ultraviolet Explorer
EV Earned Value
EVA Extravehicular Activity
EVM Earned Value Management
EVMS Earned Value Management System
EWBS Expanded Work Breakdown Structure
Acronym Description
F&PR Facilities and Planning Requirements
F/R Frequency-Off Carrier to Symbol Rate Ratio
FAA Federal Aviation Administration
FAC Full Aperture Calibrator
FAD Formulation Authorization Document
FAOTS Fairbanks Area Orbital Tracking Station
FAQ Frequently Asked Questions
FAR Federal Acquisition Regulation
FAS Frequency Assignment Subcommittee (under the IRAC)
FAST Fast Auroral Snapshot Explorer
FAX Facsimile
FCC Federal Communications Commission
FCR Facility Change Request
FCR Flight Control Room 
FCR Future Communications Requests
FD Flight Dynamics
FDCF Flight Design Computational Facility
FDD Flight Dynamics Division
FDDI Fiber Distributed Data Interface
FDF Flight Data File
FDF Flight Dynamics Facility
FDMA Frequency Division Multiple Access
FDO Fee Determination Official
FDOA Flight Dynamics Operations Area
FDOC Flight Dynamics Operations Control
FDPC Flight Dynamics Product Center
FDSDIC Flight Dynamics Systems Development and Integration Center
FEC Forward Error Correction
FEIT Flight Element Integrated Test
FEMA Federal Emergency Management Agency
FEP Front-End Processor
FEPC Front-End Processor Consolidation
FF Fast Forward
FFRDC Federally Funded Research and Development Center
FGB Zarya Control Module, Functional Cargo Block (Russian)
FGM Fleet and Ground Management
FIOA Freedom of Information Act
FIP Federal Information Processing
FIPS Federal Information Processing Standard
FIRMR Federal Information Resources Management Regulations
FL Florida
FLL Flight Loads Laboratory
FLSA Fair Labor Standards Act
FLT Flight
FM Frequency Modulation
FM Functional Managers
FMD Facilities Maintenance Division
FMLG Frequency Management Liaison Group (HQ)
FMM Financial Management Manual
FMP Future Mission Planning
FMR Financial Management Requirements
FMS Financial Management System
FOM Figure of Merit
FORTRAN Formula Translation
FOS Flight Operations Segment
FOS Flight Operations System
FOT Flight Operations Team
FPGA Field Programmable Gate Array
FPMR Federal Property Management Regulation
FPO Fleet Post Office
FPQ Fixed Pedestal Q-Type Radar
FPR Federal Procurement Regulation
FPS Flight Planning System
FQR Formal Qualification Review
FR Flash Report
FR Frame Relay
FRR Flight Readiness Review
FRS Failure Reporting System
FS First Stage
FSA Factory Service Agreement
FSA/SOW Flight Project Support Office Support Agreement/Statement of Work  
FSB Fundamental Space Biology
FSD Full-Scale Development
FSF Factory Support Facilities
FSM Flight Segment Manager
FSO Facility Security Officer
FSP Flight Project Support Office Support Program
FTE Full Time Equivalent
FTF Forward Transfer Frame
FTP File Transfer Protocol
FTS Federal Telecommunications System
FTS Federal Telephone System
FTS Frequency and Timing Subsystem 
FTS 2000 Federal Telecommunications System 2000
FTS* Flight Termination System
FTTA Federal Technology Transfer Act
FTXS FDDI Transmission System
FU Flight Unit
FUSE Far Ultraviolet Spectroscopic Explorer
FUSE Far Ultraviolet Spectroscopy Explorer
FWD Forward Link
FY Fiscal Year  
Acronym Description
G&A General and Administrative
G/T Gain to Noise Temperature Ratio
G/T Gain versus Temperature
GAGAN GPS Aided Geo Augmented Navigation
GAMES Gravity And Magnetic Earth Explorer
GAO  Government Accountability Office
GAO General Accounting Office
GAO Government Accountability Office
GARF GSFC Antenna Range Facility
GAVRT Goldstone Apple Valley Radio Telescope
Gb Gigabyte
GBMS Glenn Research Center Business Management System
Gbps Gigabits per second
GBRS Generic Block Recording System
GC Ground Controller
GCE Ground Control Equipment
GCF Ground Communications Facility
GCM Ground Control Message
GCMR Ground Configuration Message Request
GCMR Ground Control Message Reconfiguration
GCMR Ground Control Message Request
GCP Goddard Corporate Park
GCS Ground Communication System
GD General Dynamics
GDGPS Global Differential Global Positioning System
GDIS Guam Data Interface System
GDMS Goddard Directives Management System
GDOP Geodetic Dilution of Precision
GDS Call sign for Goldstone, California Ground Network Tracking Station
GDS Ground Data System
GDSCC Goldstone Deep Space Communications Complex
GDSS Global Decision Support System
GEM Galileo Extended Europa Mission
GENESIS Mission To Analyze Elemental Particles From Sun
GENSAA Generic Spacecraft Analyst Assistant
GEO Geostationary Orbiters
GEO Geosynchronous Earth Orbit
GEOTAIL Geomagnetic Tail Laboratory
GEWEX Global Energy and Water Cycle Experiment
GFAC Goldstone Frequency and Airspace Coordination
GFE Government Furnished Equipment
GFP Government Furnished Property
GFY Government Fiscal Year
GGBL GRS Generic Block Log
GGS GSFC GRO Simulator
GHB Goddard HandBook
Ghz Gigahertz
GIDEP Government Industry Data Exchange Program
GIF Graphics Interchange Format
GIFTS Geostationary Imaging Fourier Transform Spectrometer
GIG Global Information Grid
GIWG GPS International Working Group
GL Government Leased
GL Government Led
GLAST  Gama Ray Large Area Space Telescope 
GLD Goldstone Logistics Depot
GLONASS GLObal NAvigation Satellite System (Russia)
GMAT General Mission Design Tool
GMI Goddard Management Instruction
GMO Ground and Mission Ops
GMOD GPS Modular
GMSEC Goddard Mission Services Evolution Concept
GMSK Gaussian Minimum Shift Keying
GMT Greenwich Mean Time
GN Ground Networks
GN&C Guidance Navigation & Control
GNCAT Ground Network Corrective Action Team
GNSS Global Navigation Satellite System
GNUG Ground Network Users’ Guide
GO Government Owned
GOES Geostationary Operational Environmental Satellite
GOES-L Geostationary Operational Environmental Satellite-L
GOES-R Geostationary Operational Environmental Satellite-R Series
GOIN Global Observation Information Network
GOR General Operations Room
GOSIP Government Open Systems Interconnection Profile
GP-B Gravity Probe-B
GPA Government Property Administration
GPE Government Provided Equipment
GPIP General Purpose Input
GPM Global Precipitation Measurement
GPR Goddard Procedural Requirements
GPRA Government Performance and Results Act
GPS Global Positioning System
GPSD Global Positioning System Directorate
GPSMT Global Positioning System Metric Tracking
GRACE Gravity Recovery and Climate Experiment
GRAIL Gravity Recovery and Interior Laboratory
GRC Glenn Research Center  
GRGT Guam Remote Ground Terminal
GRIM Global Realtime Interactive Map
GRIPS GN Resource Implementation Plan
GRO Gamma Ray Observatory
GRS Generic Recording System
GRTS GRO Remote Terminal System
GS Goldstone
GS Ground Support
GS Ground System
GSA General Services Administration
GSBCA General Services Adminstration Board of Contract Appeals
GSBCA General Services Board of Contract Appeals
GSDE Ground Systems Development Environment
GSFC Goddard Space Flight Center  
GSI Government Source Inspection
GSIF Ground Station Interface Facility
GSIF Ground System Interface Facility
GSM Ground Segment Manager
GSOC German Space Operations Center
GSOP Ground System Operations Project
GSR Geosynchronous Satellite Report
GSS Generalized Support Software (or System)
GSSR Goldstone Solar System Radar
GSTDN Ground Satellite Tracking Data Network
GSTDN Ground Spaceflight Tracking and Data Network
GT Ground Terminal
GTA Guam Telephone Authority
GTAS Generic Trending and Analysis System
GTDM Generic Time Division Multiplexed
GTDS Goddard Trajectory Determination System
GTE General Telephone
GTE GlobalTropospheric Experiment
GTSIM Generic Telemetry Simulator
GWAC Government Wide Acquisition Contract
Acronym Description
H/W Hardware
HAA High Altitude Abort
HALCA (mu space engineering satellite)
HALOE Halogen Occultation Experiment  
HAT HSF Architecture Team
HATS Headquarters Action Tracking System
HBCU Historically Black Colleges and Universities
HBTM Hybrid Bispectral Threshold Method
HDR High Data Rate
HDRS High Data Rate System
HDSL High-Level Data Link Control
HDTV High Definition Television
HE Human Exploration
HEDS Human Exploration and Development of Space
HEF High Efficiency
HEMT High Electron Mobility Transistor
HEO High Earth Orbit
HEO High Earth Orbiters
HEO Highly Elliptical Orbiters
HEOMD Human Exploration and Operations Mission Directorate
HESSI High Energy Solar Spectroscopic Imager
HESSI High Energy Squib Simulator Instrument
HETE High Energy Transient Experiment
HF High Frequency
HGA High Gain Antenna
HH Hitchhiker
HI Hawaii
HIJ TDRSS H, I & J Satellites
HiNet High-Speed Network
HMD Hardware Maintenance Depot
HMF Hypergolic Maintenance Facility
HNSC Hellenic National Space Committee (Greece)
HOSC Huntsville Operations Support Center
HP Hewlett-Packard
HPA High Power Amplifier
HPBW Half-Power Beamwidth
HPOA High Power Optical Amplifier
HQ Headquarters
hr Hour
HRBS High Rate Black Switch (STGT)
HRDL High Rate Data Link
HRPP High-Rate Point-to-Point
HRSPT, HSPT High Rate System Performance Test
HS/NSC Human Spaceflight Network Support committee
HSB Hyperbolic Support Building
HSF Human Space Flight
HSFMS Human Space Flight Multi-Mission Services
HSMF Headquarters Spectrum Management Forum
HSPP Homeland Security Presidential Directive
HSPT High Rate System Performance Test
HSR High Sample Rate
HSR Houston Support Room
HSRT Human Systems Research and Technology
HSSI High Speed Serial Interface
HST Hubble Space Telescope
HSTI Honeywell Technical Services Inc.
HSTOCC HST Operations Control Center
HTML Hyper-Text Markup Language
HTSI Honeywell Technical Services Incorporated
HTTPS HyperText Transmission Protocol, Secure
HTV H-2 Transfer Vehicle
HTXS Next-Generation of H-2 Transfer Vehicle
HVAC Heating, Ventilation and Air Conditioning
HViDS HOSC Video Distribution System
HW Hardware
hZ Hertz
Acronym Description
I&T Integration and Testing
I/F Interface
I/T Information Technology
IAA Institutional Analysis & Alignment
IAC International Astronautical Congress
IAD Ion Assisted Deposition
IAN Institutional Area Network
IAOE Internal Areas of Emphasis
IAR Independent Annual Review
IAS Image Assessment System
IATR Initial Architecture Technology Review
IBAS Interactive Basic Accounting System
IBM International Business Machines
IBPD Integrated Budget and Performance Document
IBR Integrated Baseline Review
IC Institutional Committee
ICAO International Civil Aviation Organization
ICC Instrument Control Center
ICC Integrated Computer Complex 
ICC Intercenter Computer Complex
ICCA ISS to CEV Communications Adapter
ICCN Intercenter Council for Computer Networking
ICCWG Intercenter Communications Working Group
ICD Interface Control Document
ICE International Cometary Explorer
ICESat Ice, Cloud, and Land Elevation Satellite
ICESAT International Cometary Explorer Satellite
ICFAS Interactive Consolidated Fiscal Accounting System
ICG International Committee on Global Navigation Satellite Systems (United Nations)
ICMP Information and Configuration Management
ICS Inter-Orbit Communication System
ICSSC International Communications Satellite Systems Conference
ID Identification
IDE Integrated Development Environment
IDECS International Dark Energy Cosmology Survey
IDIQ Indefinite Delivery Indefinite Quantity
IDNX Integrated Digital Network Exchange
IDS Intrusion Detection System
IE Internet Explorer
IEC Interstate Electronics Corporation
IEEE Institute of Electrical and Electronics Engineers
IEGB Interagency GPS Executive Board
IEMP Integrated Enterprise Management Program
IETF Internet Engineering Task Force
IF Intermediate Frequency
IFDS Integrated Frequency Deconfliction System
IFL Inter-Facility Link
IFMP Integrated Financial Management Program
IFMS Interagency Fleet Management System
IFO Intensive Field Observation
IFOR Interagency Forum Operational Requirements
IFOV Instantaneous Field of View
IG Inspector General
IGARSS International Geoscience and Remote Sensing Symposium  
IGDG Internet-based Differential GPS System
IGS International GNSS Service
IGS International Ground Stations
IGSE Instrument Ground Support Equipment
IIA Institutional Infrastructure Analyses
IKI Institute of Space Research (Russia)
ILC Integrated Load Checkout
ILN International Lunar Network
ILOC Integrated Launch Operations Complex
ILR International Lunar Relay 
ILS Integrated Logistics Support
IM Intermodulation
IMAGE Imager For Magnetopause-To-Aurora Global Exploration
IMC Interagency Management Council
IMCS Integrated Management Control System
IMD Integrated Management Division of OCFO
IMDC Integrated Mission Design Center
IMI Inner Magnetosphere Imager
IMIC Integrated Managment Information Center
IMIS Interim Management Information System
IMO International Maritime Organization
IMOC Integrated Mission Operations Center
IMOC Integrated Mission Operations Complex
IMP Integrated Management Plan 
IMP Interplanetary Monitoring Platform 
IMS Information Management System
IMS Integrated Master Schedule
IMU Inertial Measurement Unit
IN Integrated Network
IN DI&S Integrated Network Development, Integration, and Sustainment
INCOSE International Council on Systems Engineering
IND Interplanetary Network Directorate
INL Integrated Network Lab
INM Integrated Network Management
INPE Instituto Nacional de Pesquisas Espaciais (National Institute for Space Research - Brazil)
INS Inertial Navigation System
INS Information Network System
INS Integrated Network Services
INSA Instituto National de Servicios Aeroespaciales
INTA Instituto National de Tecnica Aeroespaciales
INTEGRAL International Gamma Ray Astrophysics Laboratory
IOA Integrated Operations Architecture
IOAG Interagency Operations Advisory Group
IOC Initial Operational Capability
IOC Initial Operational Concept
ION Institute of Navigation
IONet Internet Protocol Operational Network
IONet IP Operational Network
IOP Ignition Over Pressure
IOP Intensive Observing Period
IOP Interoperability Plenary
IP International Partner
IP Internet Protocol
IPAD IPS Prototyping and Demonstration
IPAO Independent Program Assessment Office
IPC&E Interdependent Program Cost and Evaluation
IPCS Interprocess Communications System
IPD Information Processing Division
IPF Image Processing Facility
IPMS Integrated Procurement Management System
IPN Interplanetary Network
IPNOC Internet Protocol Network Operations Center
IPO Institutional Program Office
IPOC ISS Payload Operations Center
IPP Innovative Partnership Program
IPP Installation-Provided Property
IPS Integrated Planning System
IPS Internet Protocol Suite 
IPT Integrated Product Team
IPTX IP Transition
IPX Novell Internet Packet Exchange
IR Infrared
IR&D Independent Research and Development
IRAC Interdepartment Radio Advisory Committee
IRD Interface Requirements Document
IRG ITR Response working Group 
IRIG Inter-Range Instrumentation Group
IRM Information Resources Management
IRMS Information Resources Management Service
iROC Integrated RF/Optical Communications
IRRP Institutional Realignment and Recovery Project
IRS Indian Remote Sensing Satellite
IRSP Instrumentation Radar Support Program
IRT Independent Review Team
IRTF Internet Research Task Force 
IS Implementing Strategy
ISA Institutional Support Agreement
ISAC Information Systems Analysis and Integration Systems Contract
ISAS Institute of Space and Aeronautical Science
ISCCP International Satellite Cloud Climatology Project
ISD Information Services Division
ISDC International Space Development Conference
ISDN Integrated Switched Digital Network
ISE Integrated Service Execution
ISECG International Space Exploration Coordination Group
ISM Industrial, Scientific, and Medical
ISO Information Systems Office
ISO Infrared Space Observatory
ISO International Organization for Standardization
ISO International Standards Organization
ISP Inertial Sun-Point
ISP Internet Service Provider
ISRO Indian Space Research Organization
ISS International Space Station
ISS NETRIX Integrated Switching System
ISSO Information Systems and Services Office
ISSP International Space Station Program
ISSRC International Space Station Research Capabilities
IST Instrument Support Toolkit 
IST Integrated Support Team 
ISTP Integrated Short-Term Plan
ISTP Integrated Space Transportation Plan
ISTP International Solar Terrestrial Physics
IT Information Technology
ITA Internal Task Agreement
ITAC International Telecommunication Advisory Committee  
ITAR International Traffic In Arms Regulations
ITCOP Interagency Tracking and Communications Operations Panel
ITS Information Technology Security
ITS Integration & Test System 
ITS Intelligent Terminal System 
ITSM Information Technology Security Manager
ITTP Innovative Technology Transfer
ITU Input Terminal Unit
ITU International Telecommunication Union
ITU-R International Telecommunication Union - Radiocommunications Sector
IUS Inertial Upper Stage
IUS Interim Upper Stage
IV & V Independent Verfication and Validation
IVT Integrated Verification Testing
IWC Internal Wireless Communications
IWG Informal Working Group
Acronym Description
JASON French TOPEX/Poseiden Follow-On
Java (trademark for COTS software)
JAXA Japan Aerospace Exploration Agency
JDEM Joint Dark Energy Mission
JDQ Job Description/Qualification
JEM Japanese Experimental Module
JERS Japanese Earth Resources Sensing Satellite
JHU Johns Hopkins University
JICB Joint Integration Control Board
JIMO Jupiter Icy Moons Orbiter
JIN JSC Information Network
JIP Joint Implementation Plan
JMR Jason-1 Mission Radiometer
JOCS Job Order Cost System
JPA Job Performance Assistance
JPD JSC Policy Directive
JPEG Joint Photographic Experts Group
JPL Jet Propulsion Laboratory
JRA Johnson Real Property Administrator
JSAC Joint Strategic Assessment Committee
JSC Johnson Space Center
JTB Joint Technical Baseline
JTD Job-to-Date
JTG Joint Task Group
JTR Joint Tactical Radio
JTRS Joint Tactical Radio System
JWST James Webb Space Telescope
Acronym Description
Ka Ka frequency band
KARI Korea Aerospace Research Institute
KASI Korean Aerospace Science Institute
KATS Kennedy Administrative Telephone Services
Kbps Kilobytes Per Second
KCA KSC Cooperative Agreement
KCRT Keyboard/Cathode Ray Tube
KDD Knowledge Discovery and Data
KDP Key Decision Point
KFKI Research Institute for Particle & Nuclear Physics (Hungary)
KFRL Kennedy Forward Return Link
kHz kilohertz
KIC Knowledge Information Center (OCFO)
KICS KSC Integrated Communications Services
KLOC Thousand Lines of Code
km kilometers
KNOC Kronsberg Network Operations Center
KOMPSAT Korea Multi-Purpose Satellite
KSA K-Band Single Access
KSAF Ku Band Single Access Forward
KSAR Ku Band Single Access Return
KSAT Kongsberg Satellite Services
KSC Kennedy Space Center  
KSCNF Kennedy Space Center News Facility
KSCTV KSC Public Affairs Television
KSLOC Thousand Source Lines of Code
ksps kilo-symbols per second
Kt Knot
KTS Kennedy Tracking Station
Ku Ku frequency band
KuSA Ku-Band Single Access
kW Kilowatt
Acronym Description
L&EO Launch and Early Orbit
L-7 Landsat-7
L1 LaGrange Point 1
L2 LaGrange Point 2
LACB Landing Aids Control Building
LADEE Lunar Atmosphere and Dust Environment Explorer
LAM Laser Altimetry Mission
LAM Liquid Apogee Motor
LAN Local Area Network
Landsat Land Remote Sensing Satellite
Landsat-7 Land Remote Sensing Satellite
Landsat-7 Landsat Remote Sensing Satellite
LANL Los Alamos National Laboratory 
LaRC Langley Research Center
LAS Launch Abort System
LAT Lunar Architecture Team
LATA Local Access Transport Area
LBTM Layer Bispectral Threshold Method  
LBV Low Bandwidth Video
LC#SA Low Cost Electronically Steerable Array
LCC Launch Commit Criteria
LCC Launch Control Center
LCC Launch Control Complex
LCC Life Cycle Cost
LCDM Landsat Data Continuity Mission
LCNS Lunar Communication and Navigation Systems
LCR Launch Control Room
LCRD Laser Communications Relay Demonstration
LCT Lunar Communications Terminal
LDAR Lightning Detection and Ranging
LDBP Long Duration Balloon Project or Program
LDM Limited Distance Modems
LDPC Low Density Parity Check 
LDR Low Data Rate
LEC Local Exchange Carrier
LEISA Linear Etalon Imaging Spectral Array
LEMSCO Lockheed Engineering and Management Services Company
LEO Low Earth Orbit
LEO Data Svc Low Earth Orbit Data Services
LEO-T Low-Earth Orbiting Terminal
LEOP Launch and Early Orbit Phase
LEOP Launch Early Orbit Phase
LeRC Lewis Research Center
LEWIS New Millenium Tech Sat
LGA Low Gain Antenna
LGS Landsat-7 Ground Station
LH Launch Head
LHCP Left Hand Circular Polarization
LIMS Logistics Inventory Management System
LIRA Lunar Interferometric Radio Array 
LIS Logistics Information System
LISA Laser Inferometer Space Antenna
LLCD Lunar Laser Communcation Demonstration
LLGT Lunar Lasercom Ground Terminal
LLNL Lawrence Livermore National Laboratory  
LLO Low Lunar Orbit
LLOC Lunar Lasercom Operations Center
LLOT Lunar Laser Optical Terminal
LLST Lunar Lasercom Space Terminal
LLV Lockheed Launch Vehicle
LM Lockheed Martin  
LM Lunar Module
LMC Link Monitor and Control
LMCO Lockheed Martin Corporation
LMI Local Management Interface
LMLV Lockheed Martin Launch Vehicle
LMO Low Moon Orbiter
LMP Link Monitor Processor
LMS Life and Microgravity Science
LMSCG Lunar-Martian Spectrum Coordination Group
LMSMG Lunar-Martian Spectrum Management Group
LMSO Lockheed Martin Space Operations
LMSOC Lockheed Martin Space Operations Contract
LNA Low  Noise Amplifier
LO Lunar Orbiter
LOA Letter of Agreement
LOC Lines of Code
LOC Loss of Crew
LOE Level-of-Effort
LOF Local Oscillator Frequency
LOGOS Lights Out Ground Operations System
LOI Lunar Orbit Insertion
LOM Loss of Mission
LOP Local Operating Procedures
LOR Line Outage Recorder
LOR Lunar Orbit Relay
LOS Line of Sight
LOS Loss of Signal
LP Lunar Prospector
LPGS Level-1 Product Generation System
LPS Landsat-7 Processing System
LPS Launch Processing System
LPT Low-Power Transceiver
LR Lunar Relay
LR Lunar Rendezvous
LRC Langley Research Center
LRD Launch Readiness Date
LRO Lunar Reconnaissance Orbiter
LRR Launch Readiness Review
LRS Lunar Relay Satellite
LRU Line Replaceable Unit
LSAM Lunar Surface Access Module
LSD Launch Support Directive
LSD Logistics Support Depot
LSDS Life Sciences Data System
LSFEP Life Sciences Flight Experiments Program
LSR Launch Support Room
LSS Lean Six Sigma
LUTE Lunar Ultraviolet Telescope Experiment
LV Launch Vehicle
LVDC Launch Vehicle Data Center
LWCA Lost Workday Cases Away
LWS Living with a Star
LZP Level Zero Processing
LZPF Level Zero Processing Facility
LZPS Level Zero Processing System
Acronym Description
M&O Maintenance and Operations
M&O Mission Operations
M-PSK M-ary Phase Shift Keying
m/s Meters Per Second
m2mi Machine-to-Machine Intelligence Corporation
MA Multiple Access
MACS Mission and Computing Support
MAD Call sign for Madrid, Spain Ground Network Tracking Station
MAF Michoud Assembly Center
MAF Multiple Access Forward
MAGR Miniturized Airbourne GPS Receiver
MAO Management Assessment Office
MAP Microwave Anisotropy Probe
MAPS Measurement of Air Pollution from Satellites
MAR Mission Analysis Room
MAR Mission Assurance Requirement
MAR Multiple Access Return
MaRS Metrics and Reporting Study
MARSIS Mars Advanced Radar for Subsurface and Ionospheric Sounding
MAVEN Mars Atmosphere and Volatile EvolutioN
MAX Office of Management and Budget's computer system for budgeting submissions
Mb Megabit
MB Megabyte
Mb/s Megabits per Second
MBF Mission Build Facility
Mbps Megabytes per second
Mbps Million bits per second
MBR Microwave Background Radiation
MCC Mission Control Center
MCC-M Mission Control Center - Moscow
MCD Maximum-likelihood Convolutional Decoder
MCG Mojave Coordinating Group
MCO Mars Climate Orbiter
MCR Mission Concept Review
MD Maryland
MD Mission Directorate
MDA Metric Data Assembly
MDAA Mission Directorate Associate Administrator
MDC McDonnell Douglas Corporation
MDC Mission Director's Center
MDL Microgravity Development Laboratory
MdM Metadata Manager
MDM Multiplexer/Demultiplexer
MDR Medium Data Rate
MDSC Mission Data Storage Consolidation
MDSCC Madrid Deep Space Communications Complex
MDSU Mission and Data Services Upgrades
ME Memory Effect
ME Mission Engineering
MECO Main Engine Cut-Off
MEI Mission Essential Infrastructure
MEIT Multi-Element Integration Test
MEJI Mars Exploration Joint Initiative
MEL Mission Engineering Link
MEO Medium Earth Orbit
MEP Management Education Program
MEP Mars Exploration Program
MER Mars Exploration Rover
MER Maximum Error Rate
MER Mission Evaluation Room 
MER1 Mars Exploration Rover 1
MER2 Mars Exploration Rover 2
MESSENGER MErcury Surface, Space ENvironment, GEochemistry, and Ranging 
MESUR Mars Environmental Survey
METEOSAT Meteorological Satellite
METOP  Meterological Operational Satellite
MEX Mars Express
MF Multifrequency
MFR Multifunction Receiver
MGA Medium Gain Antenna
MGS Mars Global Surveyor 
MGS Master Ground Station
MGS McMurdo Ground Station 
MGSO Multi-mission Ground Systems Office
mHz megahertz
MI Magnetospheric Imaging
MIA Master Interagency Agreement
MIDEX Medium Class Explorer
MIDEX Middle-Sized Explorer
MIL Call sign for Merrit Island Ground Network Tracking Station
MIL Military
MIL-STD Military Standard
MILA Merritt Island Launch Annex
MILA Merritt Island Launch Area
MILA/BDA Merritt Island/Bermuda
Min Minimum
Min Minute
Minisat Miniature Satellite
MINISAT Spanish Satellite
MIPR Military Interdepartmental Purchase Request
MIS Management Information System
MIS RDMS Mission Information System Relational Database Management System
MISR Multi-angle Imaging Spectroradiometer  
MISSE Materials International Space Station Experiment
MIT Massachusetts Institute of Technology
MIT/LL MIT/Lincoln Laboratory 
MLB Master Link Book
MLC Master List Custodian
MLCD Mars Lasercom Demonstrator
mm Millimeter
MMIS Mission Management Information Service
MMO Mission Management Office
MMS Magnetospheric Multiscale Satellite
MMS Matra Marconi Space, France
MMS Multimission Modular Spacecraft
MMSEV Multi-Mission Space Exploration Vehicle
MMT Mission Management Team
MN Mars Network
MO Mission Operations
MO&DSD Mission Operations & Data Systems Directorate
MOA Memorandum of Agreement
MOARS M&O Anomaly Reports
MOC Ministry of Communications (Israel)
MOC Mission Operations Center 
MOC Mission Operations Complex
MOC Mission Operations Computer 
MOCC Mission Operations Control Center
MOCS Mission Operations and Communications System
MOD Mission Operations Directorate
MODIS Moderate Resolution Imaging Spectroradiometer
MODNET MO&DSD Operational/Development Network
MODNWT MO&DSD  Operations/Development Network
MODSIN Mission Operations and Data Systems Information Network
MOE Measures of Effectiveness
MOIMS Mission Operational and Information Management Services
MOIR Mission Operations Integration Room
MOL Mission Operations Laboratory
MOL Mission Operations Link
MOMS Mission Operations/Mission Services
MON Monitor
MOO Nascom Memorandum of Operation
MOP Mission Operations Project
MOPITT Measurement of Pollution in the Troposphere
MOPSS Mission Operations Planning and Scheduling System
MOR Mission Operations Room
MOS Mission Operations Summary
MOSA Mission Operations Support Area
MOSDD Mission Operations and System Development Division
MOSO Multi-mission Operations Support Office
MOSP Mission Operations Support Plan
MOU Memorandum of Understanding
MOVE Mission Operations Voice Enhancement
MPA Metric Pointing Assembly
MPA Metric Processor Assembly 
MPBS Megabytes Per Second
MPCV Multipurpose Crew Vehicle
MPF Mars Pathfinder
MPIM Multi-Program Integrated Milestones
MPPF Multi-Payload Processing Facility
MPR Mission Planning Room
MPS Mulit Program Support
MPSR Multi-Purpose Support Room
MPT Mission Planning Terminal
MPX Mapped Program Executive
MR Mars Relay
MRCS Mission Requirements Control System
MRF Maintenance & Repair Facility
MRO Mars Reconnaissance Orbiter
MRR Mission Readiness Review
MRR Mission Requirements Request
MRT Mission Readiness Test
MRTT Mission Readiness Test Team
MS Management System
MS Mars Surveyor
MS Mission System
MS&C Mission Support & Communication
MSAM Mars Surface Access Module
MSBLS Microwave Scanning Beam Landing System
MSC Mission Support Contract
MSC Mission Systems Contract
MSCF Mission Services Customer Forum
MSD Mission Services Delivery
MSFC Marshall Space Flight Center  
MSFN Manned Space Flight Network
MSL Mars Science Laboratory
MSL Mission Support LAN
MSLS Multiservice Launch Systems (Minuteman II)
MSM Mission and Science Measurement Technology
MSM Mission Services Manager
MSO Mars Science Orbiter
MSO Mission Support Office
MSOC Mission Support Operations Contract
MSOCC Multisatellite Operations Control Center
MSP Mission Support Program
MSPN Mission Support Payload Network
Msps Mega symbols per second
MSR Mission Support Request
MSR Mission Support Room
MSR Monthly Status Reviews
MSRD Mission Requirements Document
MSS Mass Storage System
MSTO Mars Science and Telecommunications Orbiter
MTA Metric Tracking Assembly
MTBF Mean Time Between Failures
MTO Mars Telecom Orbiter
MTPE Mission to Planet Earth
MTRS McMurdo TDRSS Relay System
MTRS McMurdo Tracking Relay System
MTTR Mean Time to Repair
MTV Mars Transfer Vehicle
MUSES Mu Space Engineering Satellite
MUSS Multi-User Systems & Support
MVS Multiple Virtual System
Acronym Description
N/A Not Applicable
NAC NASA Advisory Committee
NAC National Agency Check
NAC Network and Communications
NACAIT Network And Communication Analysis & Integration Team
NACC NASA Automated Data Processing Consolidated Center
NAFCOM NASA Air Force Cost Model
NAI National Aerospace Initiative
NALF Naval Auxiliary Landing Field
NARA National Archives and Records Administration
NAS Numerical Aerodynamic Simulation
NASA National Aeronautics and Space Administration
NASCOM NASA Communications Network
NASCOP NASA Communications Operating Procedures
NASDA National Space Development Agency of Japan
NASIRC NASA Automated Systems Incident Response Capability
Nav Navigation
NBS National Bureau of Standards
NCAR National Center for Atmospheric Research
NCASEMM NASA Computer Aided System Engineering Management Model
NCC Network Control Center
NCCDS Network Control Center Data System
NCCOSC Network  Control Center Operational Support Complex
NCDC National Climatic Data Center
NCI NASA Collaborative Infrastructure
NCMA National Contract Management Association
NCO National Coordination Office
NCP Network Control Project
NCPS Network Command Processor System
NCS National Communications System
NCTAMS Naval Computer and Telecommunications Area Master Station
NCTAMS Navy Computer and Telecommunications Air Master Station
NDC Network Development Center
NDVI Normalized Difference Vegetation Index 
NE Near Earth
NEAR Near Earth Asteroid Rendezvous
NEC Nippon Electronic Corporation
NEE Near Earth Element
NEMS NASA Equipment Management System
NEN Near-Earth Network (formerly the Ground Network-GN)
NENS Near Earth Networks Services
NENUG Near Earth Network User's Guide
NEO Near Earth Object
NEPA National Environmental Policy Act
NERDS NASA Electronic Radio Database System
NERN Near Earth Relay Network
NESP NASA Engineering Standards Panel
NETEX Network Executive
NETSIM Network Simulator
NeTT Network Test Tool
NEX NASA Excepted Service
NEXRAD Next Generation Radar
NF Noise Figure
NFS NASA FAR Supplement
NGATS Next Generation Air Transportation System
NGI Next Generation Internet
NGIN Next Generation Integrated Network
NGLT Next Generation Launch Technology
NGO Non-Governmental Organization
NGST Next Generation Space Telescope
NHB NASA Handbook
NIC Network Integration Center
NID NASA Interim Directive
NIE Networks Integration and Engineering
NIF NASCOM Interface Facility
NIH National Institutes of Health
NII National Information Infrastructure
NIM Networks Integration Manager
NIMO Networks Integration Management Office
NIMS Network Information Management System
NIOP NASCOM Input/Output Port
NIR Near Infrared
NIS Network Information System
NIS NOCC Information Server 
NISN NASA Information System Network
NISN NASA Integrated Services Network
NISS NASA Institutional Support Systems
NISSU NASA Information Systems Services Utility
NIST National Institute of Standards and Technology
NLDN National Lightning Detection Network
NLT Not Less Than
NM New Mexico
NM New Millennium
NM Next Month
NM$ NAFCOM Millions of Dollars
NMC National Center for Atmospheric Research
NMC Network Management Center (MSFC)
NMC Network Monitor and Control (JPL)
NMDS Network Management Data Service
NME Non-Maintainable Equipment
NMI NASA Management Instruction
NMI Nautical Mile
NMO NASA Management Office
NMOS Network and Mission Operations Support
NMS Network Management System
NMSC Network Monitoring, Scheduling and Control
NOA New Obligational Authority
NOAA National Oceanographic and Atmospheric Administration
NOC Networks Operations Center
NOC New Operations Center
NOCC Network Operations Control Center
NOCS Nascom Overseas Communication System
NOCT Network Operations Control Team
NODC National Ocean Data Center 
NODIS NASA Online Directives Information System Procedures and Guidelines
NODNET NASCOM Operational Data Network
NOI's Notice of Inquiry(s)
NOIT Network Operations Integrations Team
NOLAN NASCOM Operational Local Area Network
NON Network of Networks
NOP Network Operating Plan
NOP Network Operations Plan
NOPE Network Operations Project Engineer
NORAD North American Air Defense Command
NOSP Network Operations Support Plan
NPAF Network Planning and Analysis Facility
NPAS Network Planning and Analysis System
NPAT NISN Performance Assessment Team
NPD NASA Policy Directive
NPD NASA Procedural Directive
NPG NASA Procedures and Guidelines
NPLD North Polar Layered Deposit
NPM Normal Pointing Mode
NPOESS National Polar-Orbiting Operational Environmental Satellite System
NPP Net Primary Productivity 
NPP Network Planning and Preparation
NPP NPOESS Preparatory Project
NPPS NASA Personnel and Payroll System
NPR NASA Procedural Requirement
NPR National Performance Review
NPSS NASA Packet Switching System
NRA NASA Research Announcement
NRD Network Requirements Document
NRE Non Recurring Engineering
NREL National Renewable Energy Laboratory  
NREN NASA Research and Education Network
NRO National Reconnaissance Office
NRT Near Real-Time
NRZ Non-Return to Zero
NS Netscape Navigator
NS Network Services
NSAP Network Service Assurance Plan
NSAP1 Network Services Assurance Plan1
NSAP2 Network Services Assurance Plan2
NSBRI National Space Biomedical Research Institute
NSC Network Systems Corporation
NSC Norwegian Space Center
NSCC NASCOM Security Control Center
NSCP National Space Communications Program
NSD Network Services Division
NSD NISN Services Document
NSDP NASCOM System Development Plan
NSE New Service Element
NSEP National Security Emergency Preparedness
NSF National Science Foundation
NSF Network Support Facilities
NSG Network Support Group
NSI NASA Science Internet
NSI Nuclear Systems Initiative
NSMA NASA Spectrum Management Authority
NSP NASA Support Plan
NSP Network Support Plan
NSPO National Space Program Office (Taiwan)
NSPSEWG Network Services Projects Systems Engineering Working Group
NSR NISN Service Request
NSS Network Support Subsystem
NSSA National Security Space Architect
NSSC NASA Shared Services Center
NSSDC National Space Science Data Center
NSTAC National Security Telecommunications Advisory Committee
NSTC National Science and Technology Council
NSTS NASA Space Transportation System
NTC NASA Teleconferencing Center
NTE Not to Exceed
NTIA National Telecommunications and Information Administration
NTP Netrix Trunk Protocol
NTR Network Service Assurance Plan (NSAP) Technology Refresh
NTSP NASA Technical Standards Program
NTTF Networks Technical Training Facility
NTU Network Technology Upgrade
NVP NOCC Very Long Baseline Interferometry (VLBI) Processor
NVTS Nascom Video Transponder Service
NWAG NASA Wireless Advisory Group
NWAG NASA WRC Advisory Group
NWS National Weather Service
Acronym Description
O&C Operations and Checkout
O&M Operations and Maintenance
OAFB Onizuka Air Force Base
OAS Operations and Support
OAST Office of Aeronautics & Space Technology
OAT Office of Aerospace Technology
OBC On-Board Computer
OBE Onboard Equivalent
OBPR Office of Biological and Physical Research
OBS Organizational Breakdown Structure
OC Operations Center
OC Optical Carrier
OC Optical Character
OC-N Optical Carrier-N
OCACT Ohio Consortium for Advanced Communications Technology
OCD Operating Control Directive
OCE Office of the Chief Engineer
OCFO Office of the Chief Financial Officer
OCIO Office of Chief Information Officer
OCN Order Control Number
OCO Orbiting Carbon Observatory
OCONUS Outside the Continental United States
OCR Operational Control Room
OCR Operations Control Room
OCSM Organization Computer Security Manager
OCT Office of the Chief Technologist
OCT Optical Communications Technologies
OCTL Optical Communication Telescope Labratory
OD Operations Directive
OD Orbit Determination
ODAC Orion Design Analysis Cycle
ODC Other Direct Costs
ODIN Outsourcing Desktop Initiative for NASA
ODM Operational Data Message
ODM Orbit Data Message
ODRC Operational Data Reduction Complex
ODY Odyssey
OE Operational Engineer
OEM Orbit Ephemeris Message
OES Office of Earth Science
OFPP Office of Federal Procurement Policy
OGC Office of the General Counsel
OIG Office of Inspector General
OIG Orbital Information Group
OIIR Office of International Interagency Relations
OIS Operational Intercommunications System
OIS-D Operational Intercommunications System Digital
OIS-Q Operational Intercommunications System Quintron
OLA Office of Legislative Affairs
OLA Operating Level Agreement
OLIA Office of Legislative and Intergovernmental Affairs
OLSG Optical Link Study Group
OLVBI Orbiting Very Long Baseline Interferometry
OMB Office of Management and Budget
OMC Operations Management Council
OMCS Operations Monitor and Control System
OMG Object Management Group 
OMI Ozone Monitoring Instrument
ONC Other NASA Cost
OP Operational
OP Orbit Prediction
OP Outer Planet
OP Output Processor
OPD Operations Procedures Directive
OPF Orbiter Processing Facility
OPII Office of Program and Institutional Integration
OPP Operational Point-to-Point
OPR Office of Primary Responsibility  
OPRT Operations Performance Review Team
OPS Operations
OR Operations Requirements
ORAM Operations Resource Allocation Management
ORBCOMM OSC Commercial Communications Satellite
ORNL Oak Ridge National Laboratory
ORO Operational Readiness Order
ORR Operational Readiness Review
ORS Online Reservation System
ORSTED ORSTED Scientific Microsatellite
ORT Operational Readiness Test
OS Operating System
OS-2 Operating System 2
OSB Operational Support Building
OSC Office of Space Communications
OSC Operations Support Center
OSC Orbital Sciences Corporation
OSD Operations Support Directive
OSDBU Office of Small and Disadvantaged Business Utilization
OSE Orbital Support Equipment
OSF Office of Space Flight
OSHA Occupational Safety & Health Agency
OSI Open Systems Interconnection
OSMA Office of Safety and Mission Assurance
OSMS Operational Support Message System
OSO Office of Space Operations
OSO Operations Services Office
OSP Orbital Space Plane
OSS Office of Space Science
OSSC Operations Support Services Contract
OST Operations Support Team
OSTM  Ocean Surface Topography from Space Missions
OSTP Office of Science & Technology Policy
OTV Operational Television
OVEIWG Orion Vehicle Engineering Integration Working Group
Acronym Description
P-REC Received Power
P/AWS Paging and Area Warning System
P/L Payload
P/SDR Program System Design Review
P/SRR Program System Requirements Review
P2P Point-To-Point
P2P Program to Program
PA&E Program Analysis And Evaluation
PAA Phased Array Antenna
PAA Program Alignment & Analysis
PABX Private Automated Branch Exchange
PAC Partial Solar Calibrator
PACOR Packet Processor
PACOR-A Packet Processor Automation
PAD Packet Assembler/Disassembler
PAD Project Authorization Document
PAIG Program and Institutional Guidance
PAMWG Performance Assessment Metrics Working Group
PAO Public Affairs Office
PAPAC Provide Aerospace Products and Capabilities
PAR Performance Accountability Report
PAR Performance and Accountability Report
PARS Playback Anomaly Recovery System
PART Program Assessment Rating Tool
PARTNeR Proyecto Academico con el Radiotelescopio de NASA en Robledo (Spanish equivalent of GAVRT)
PASS Primary Avionics Software System
PAV Progress Assistance Visit
PB President's Budget
PBMA Process Based Mission Assurance
PBX Post Base Exchange
PC Personal Computer
PCA Program Commitment Agreement  
PCASS Program Compliance Assurance and Status System
PCB Polychlorinated Biphenyl
PCB Printed Circuit Board
PCB Program Control Board
PCC Permanent Consultative Committee
PCC Processing Control Center
PCCA Principal Center for Communications Architecture
PCCB Program Change Control Board
PCD Process Control Document  
PCD Project Commitment Document
PCE Project Communications Engineers
PCFC Proposed Change from Control
PCFS Personal Computer Field System
PCM Program Control Manager
PCM Pulse Code Modulation
PCN Page Change Notice
PCN Procurement Control Number
PCS Personal Communication Service
PD Position Description
PD Program Directive
PDAC Procedures Development and Control
PDB Project Data Base
PDC Payload Development Capability
PDD Presidental Decision Directive
PDF Portable Date File format
PDF Programmable Data Formatter
PDG Payload Data Generator
PDL Ponce de Leon
PDL Procedure Distribution List
PDM Program Decision Memorandum
PDMS Product Data Management System
PDN Public Data Network
PDR Preliminary Design Review
PDSS Payload Data Services System
PDT Procurement Development Team
PDU Power Distribution Unit
PE Program Executive
PEB Performance Evaluation Board
PEC Performance Evaluation Committee
PEPE Plasma Experiment for Planetary Exploration
PF Processing Facility
PFD Power Flux Density
PFF Pluto Fast Flyby
PFOTS Poker Flats Research Range Orbital Tracking Station
PFP Program Financial Plan
PFRR Poker Flats Research Range
PFS Poker Flat Station
PG Procedural Guideline
PGOC Payload Ground Operations Contract
PGS Product Generation System
PHSF Payload Hazardous Servicing Facility
PHW Program Hours Worked
PI Principal Investigator
PI Program Integration
PI Program Introduction
PI/TL Principal Investigator/Team Leader
PIM Program Integration Manager
PIMC Program/Institutional Management Council 
PIMS Payload Information Management System
PIN Personal Identification Number
PIN Product Identification Number
PIO Program Integration Office
PIO Public Information Office
PIP Premium Internet Protocol
PIP Process Improvement Project
PIR Program Implementation Review
PjM Project Manager
PL Postlanding
PLC Postlanding Communications
PLC Programmable Logic Control
PLOP Physical Layer Operations Procedure
PM Phase Modulation
PM Post Meridiem
PM Program Management
PM Program Manager
PMA President's Management Agenda
PMB Performance Measurement Baseline
PMB Program Management Budget
PMC Program Management Council
PMEL Precision Measuring Equipment Laboratory
PMIC Payload Mission Integration Contract
PML Phoenix Mars Lander
PMM Program Management Metrics
PMP Point-to-Multipoint
PMP Program Management Plan
PMR Program Management Review
PMS Performance Measurement System
PMSR Project Management Status Report
PMT Program Management Tool 
PN Pseudo-Random Noise
PNP Preliminary Network Plan
PNT Positioning, Navigation, and Timing 
PO Purchase Order
POC Payload Ops Center
POC Point of Contact
POCC Payload Operations Control Center (JPL)
POCC Project Operations  Control Center (GSFC, JSC, MSFC)
POCS Photo Optical Control System
POIC Payload Office Integration Center
POIC Payload Operations Integration Center
POIF Payload Operations Integration Function
POIS PSCNI Online Information Service
Polar Polar Auroral Plasma Physics Spacecraft
POLAR Polar Plasma Laboratory
POMB Plant Operations Maintenance Branch
POP Period of Performance  
POP Program Operating Plan
POR Program Operating Room
Portcomm Portable Communications
PP Planning Package
PP Program Plan
PPA Pollution Prevention Act
PPBE Planning, Programming, Budgeting, and Execution
PPE Personal Preference Electronics
PPF Payload Processing Facilities
PPM Program Performance Metrics
PPP Point-to-Point Proximity
PPR Program Planning Review
PPS Packet Processing System
PPS Payload Planning System (MSFC)
PPS Precise Positioning System
PR Project Requirements
PRA Probabilistic Risk Analysis
PRA Project Reporting Attribute
PRACA Problem Reporting and Corrective Action
PRB Peer Review Board
PRCB Program Requirements Control Board
PRD Program Requirements Document
PRD Resources Planning Division (OCFO)
PRG Program and Resources Guidance
PRG Program Requirement Guidelines
PRG Program Requirements Guidance
PRGM Program  
PRI Primary Rate Interface
PRI&BRI Primary and Basic Rate Interface
PrISMS Program Information Systems Mission Services
PRMD Private Management Domain
PRS PORTS Refurbishment System
PSC Policy and Strategic Communications
PSC Program Support Communications
PSCN Program Support Communications Network
PSCRD Program Support Communications Requirements Document
PSE Program Systems Engineering
PSE Programmable Serializer Equipment
PSHS Public Safety and Homeland Security Bureau
PSLA Project Service Level Agreement
PSM Power Slice Module
PSM Procurement Strategy Meeting
PSP Program Support Plan
PSR Physical Sciences Research
PSR Program Status Review
PSS Packet Switching System (MSFC)
PSS Platform System Services
PSS Portable Spacecraft Simulator (GSFC)
PSTN Public Switched Telephone Network
PTA Portable TDRSS Antenna
PTC Pacific Telecommunication Council
PTC Payload Training Capability
PTP Programmable Telemetry Processor
PTT Postal Telegraph and Telephone
PUC Power Utilities Commission
PUMP Project Utilization Management Position
PVAMU Prairie View A&M University
PVC Permanent Virtual Circuits
Acronym Description
Q&A Question and Answer
Q-R Quick-Reaction
Q3 Quanitizing Processor 3
Q3R Quanitizing Processor 3- replacement
QA Quality Assurance
QM Quality Manual
QMS Quality Management System
QOS Quality of Service
QPI Quality Performance Index
QPMR Quarterly Program Management Review
QPSK Quadrature Phase Shift Key
QRA Quantitative Risk Assessment
QUIKSCAT Quick Scatterometer
QZSS Quasi-Zenith Satellite System
Acronym Description
R&AD Research and Advanced Development
R&D Research and Development
R&R Requirements and Response
R/SPAR Receiver/Software Programmable Advanced Receiver
RAB Registration Accreditation Board
RAC Remote Access Computer
RADARSAT Radar Satellite
RAF Return All Frames
RAID Redundant Array of Independent Disks
RAID Reports and Information Distribution
RAIF Research Aircraft Integration Facility
RAM Random Access Memory
RAM Responsibility Assignment Matrix
RASCL Remote Aircraft Satellite Communications Link
RASM Remote Access Scheduling Mailbox
RBAM Risk-Based Acquisition Management
RBOC Regional Bell Operating Company
RC Records Custodian
RCCA Root Cause Corrective Action
RCCFMG Radiocommunications Coordinating Council Frequency Management Group
RCF Return Channel Frame
RCI Remote Control Interface
RCM Reliability Centered Maintenance
RCRA Resource Conservation and Recovery Act
RCS  Radiocommunication Conference Subcommittee
RCS RadioCommunications Sector
RDD Return Data Delay
RDTE Research, Development, Testing and Evaluation
RE Ranging Equipment
RE Recurring Engineering
RECP Request for Engineering Change Proposal
REM Remote Extension Moscow (JSC)
REMAP Research Maximization and Prioritization Task Force
RENAISSANCE Reusable Network Architecture for Interoperable Space Science, Analysis, Navigation and Control Environments
Req'ts Requirements
RER Radar  Extimated Rain
RER Receive Echo Request
RER Receiver-Exciter Ranging
RERS Receiver/Exciter Ranging System
RF Radio Frequency
RFA Request for Action
RFC Radio Frequency Compatibility
RFI Radio Frequency Interference
RFISS Radio Frequency Interference Surveillance System
RFP Request for Proposal
RFQ Request for Quotation
RFS Radio Frequency Surveillance (JPL)
RFS Request for Service
RFSA Russian Federal Space Agency
RFSOC Radio Frequency Simulations Operations Center
RFTS Radio Frequency and Telemetry Station
RGRT Remote GRO Relay Terminal
RGS Requirements Generation System
RHCP Right Hand Circular Polarization
RHESSI Reuven Ramaty High Energy Solar Spectroscopic Imager
RI Research Institution
RID Review Item Discrepancy
RID Review Item Disposition
RIDM Risk-Informed Decision Making
RIDS Review Item Discrepancy System
RIE Rapid Improvement Events
RIF Reduction in Force
RISC Reduced Instruction Set Computer
RISM Range Information Systems Management
RLEP Robotic Lunar Exploration Program
RLV Reusable Launch Vehicle
RLZP Re-engineered Level Zero Processor
RM Requirement Manager
RM Review Manager
RM Risk Management
RMA Reliability/Maintainability/Availability
RMAO Resources Management and Analysis Office
RMB Risk Management Board
RMD Risk Management Database
RMDC Radiometric Data Conditioning
RMDT Radio Metric Data Team
RMO Risk Management Officer
RMOC Remote Mission Operations Center
RMP Risk Management Plan
RMWG Risk Management Working Group
ROC Remote Operations Center
ROCC Range Operations Control Center
ROCSAT Republic Of China Satellite
ROI Return on Investment 
ROM Read-Only Memory
ROM Rough Order Magnitude
ROS Research and Operations Support
ROSAT Roentgen Satellite
Rosetta (comet rendezvous mission)
RPFS Research Partnerships and Flight Support
RPOD Rendezvous, Proximity Operations, and Docking
RPS Record and Playback Subsystem
RPS Retrieval Processing System
RS Relay Satellite
Rs Symbol Rate
RSA Russian Space Agency
RTC Real Time Combiner
RTL Risk Tracking Log
RTLS Return to Launch Site
RTN Return Link
RTO Return to Operations
RTODS Real-Time Orbital Determination System
RTOP Research Technology Objectives and Plans
RTS Real Time System
RUPS Recorder/Utility Processor System
RUST Remote User Scheduling Terminal
RXTE Rossi X-Ray Timing Explorer
Acronym Description
S&MA Safety and Mission Assurance
S-E Space-to-Earth
S-S Space-to-Space
S/A Supplemental Agreement
S/C Spacecraft
S/W Software
SA Service Agreement
SA Single Access
SA Spacecraft Adapter
SA Supplemental Agreement
SA System Administrator
SA&R System Architecture and Requirements
SAA Space Act Agreement
SAAM Space Act Agreement Maker
SAC Satellite de Aplicaciones Cientificas
SAC Senate Appropriations Committee
SAC-B/HETE Scientific Applications Satellite/High Energy Transient
SAC-C Satellite de Aplicaciones Cientificas
SAEF Spacecraft Assembly and Encapsalation Facility
SAGE Stratospheric Aerosol & Gas Experiment
SAIC Science Applications International Corporation
SAID Strategic Analysis & Integration Division
SAIL Shuttle Avionics Integration Lab
SAM Stratospheric Aerosol Measurement
SAMPEX Solar Anomalous and Magnetospheric Particle Explorer
SAMS Servicing and Maintenance System
SANA Space Assigned Numbers Authority
SAR Schedule and Request
SAR Search and Rescue
SAR Software Acceptance Review
SAR Synthetic Aperture Radar
SAREX Shuttle Amateur Radio Experiment
SARSAT Search & Rescue Satellite Aided Tracking
SAS Shuttle Avionics System
SAVE (solstice MTPE instrument)
SAVIO Software and Avionics Integration Office
SB Small Business
SB/SDB Small Business/Small Disadvantage Business
SBAS Satellite-based Augmentation System (ESA)
SBDR Strategic Budget Decision Review
SBIR Small Business Innovation Research
SBLO Small Business Liaison Officer
SBU Sensitive But Unclassified
SC Security Critical
SC Space Communications
SC Spacecraft
SC Statement of Capability
SC Switching Center
SCA Simulation Control Area
SCAMA Switching, Conferencing, and Monitoring Arrangement
SCaN Space Communications and Navigation
SCaNCB Space Communications and Navigation Control Board
SCAP Shared Capacity Asset Program
SCAR Smoke, Clouds, and Radiation
SCAWG Space Communications Architecture Working Group
SCCIB Space Communications Coordination and Integration Board
SCD Satellite Ceintificus Development -(Brazilian Environ)
SCDS Space Communications & Data Systems
SCE Spacecraft Command Encoder
SCENIC SCaN Compatability Environment for Networks and Integrated Communications
SCID Spacecraft Identifier
SCIF Sensitive Compartmented Information Facility
SCIO Space Communications Integration Office
SCIP SCaN Constellation Integration Project
SCISAT Scientific Satellites From Canada
SCM Single Column Model
SCM Space Operations Commercialization Manager
SCMB Space Communications Management Board
SCMM Space Communications Mission Model
SCNS Space Communications Network Services
SCO Space Communications Office
SCP Station Communications Processor
SCPB Space Communications Planning Board
SCPS Space Communications Protocol Standards
SCR Selective Catalytic Reduction
SCR SOMO Change Request
SCR Strip Chart Recorder
SCS Scan Correlated Shift
SCS Specialized Customer Services
SCSC Spacecraft Computer Support Center
SCSI Small Computer System Interface
SCTS SCaN Compatibility Test Set
SCWG Spacecraft Control Working Group
SD2 NISN Service Design and Development
SDA Subcarrier Demodulator Assembly
SDB Small Disadvantaged Business
SDC Shuttle Data Center
SDD Software Design Document
SDF Software Development Facility
SDI Space Data, Inc.
SDIL Software Development Integration Laboratory
SDIS Switched Digital Integrated Service
SDLC Synchronous data link control
SDO Solar Dynamics Observatory
SDO Solar Dynamics Observatory
SDO Space Discovery Office
SDOM Station Development Operations Meeting
SDP Science Data Processing
SDPF Sensor Data Processing Facility
SDR Software Defined Radio
SDR System Definition Review 
SDR System Design Review
SDS Shuttle Drawing System
SDS Switched Data Service
SDSMP Space Data Standards Management Plan
SDSR Service Delivery Status Report
SDU Stardust
SE Systems Engineering
SE&A Systems Engineering and Architecture
SE&I Systems Engineering & Integration
SEA Scientist's Expert Assistant
SEAS Systems Engineering and Analysis Support
SEASTAR Commercial Data Buy Of Ocean Color Data
SEAT Safety Engineering Analysis and Test
SeaWiFS Sea-viewing Wide Field-of-View Sensor
SEB Source Evaluation Board
SEC Sun-Earth Connection
SEDS Small Expendable Deployer System
SEDSAT Students For Exploration & Development Satellite
SEER Support Enginering Evaluation Room
SEF Sustaining Engineering Facility
SEF System Engineering Facility (GSFC)
SEID Service Element Identification
SELENE SELenological and ENgineering Explorer
SELV Small Expandable Launch Vehicle
SEMP Systems Engineering Management Plan
SER Savings Estimating Relationship
SERF Software Engineering Research Facility
SERS Space Erectable Radiator System
SES Senior Executive Service
SET Systems Engineering Team
SEU Structure and Evolution of the Universe
SEWG Systems Engineering Working Group
SEWP Solutions for Enterprise-Wide Procurement
SFAC Space Flight Advisory Council
SFCG Space Frequency Coordination Group
SFOC Space Flight Operations Contract(or)
SFOF Space Flight Operations Facility
SFS Space and Flight Support
SG Study Group (ITU-R)
SG 4 ITU-R Study Group 4 - Fixed Satellite Service
SG 7 ITU-R Study Group 7 - Science Services
SGAS  Second Guam Antenna System
SGI Silicon Graphics Inc.
SGL Space Ground Link
SGLT Space to Ground Link Terminal
SGS Svalbard Ground Station (Norway)
SGSS Space Network Ground Segment Sustainment
SH&E Safety, Health and Environment
SHE Safety, Health and Environment
SHFE Space Human Factors Engineering
SHO Scheduling Order
SI System Integration
SIAG Space Internetworking Architecture Group
SIC Standard Industrial Classification
SIC Support Identification Code (GSFC)
SIGI Space Integrated GPS/INS
SII Strategic Institutional Investments
SIIP Space Internetworking Infusion Project
SIM Space Interferometer MIssion
SIMSS Scalable Integrated Multimission Simulation Suite
SINSG SCaN Integrated Network Steering Group
SIOT System Integrated Operations Test
SIP Standard Internet Protocol
SIP Summer Internship Program
SIRD Support Instrumentation Requirements Document
SIRTF Space Infrared Telescope
SIRTF Space Infrared Telescope Facility
SIS Science Information Services
SITF Space Infrared Telescope Facility
SIUG Special Interest User Groups
SIV&V System Integration, Verification, and Validation
SIVVP SCaN Integration Verification & Validation Plan
SKS Soalbards Kronsberg Station
SL Senior Level
SLA Service Level Agreement
SLC Scan Line Corrector
SLDPF Spacelab Data Processing Function
SLE Space Link Extension
SLF Shuttle Landing Facility
SLI Space Launch Initiative
SLOC Single Line of Code
SLOC Source Lines of Code
SLP System Level Procedure
SLPP Summary Level Planning Package
SLR Satellite Laser Ranging
SLS Space Launch System
SLSS Shuttle Launch Support System
SM Service Module
SM Spectrum Management
SM Statistical Multiplexer
SMA S-band Multiple Access (GSFC)
SMA Scan Mirror Assembly
SMA Science Monitoring Area
SMAC System Monitor and Control
SMAF S-band Multiple Access Forward
SMAP Soil Moisture Passive and Active
SMAR S-band Multiple Access Return
SMART SCaN Management Automation Resources Tool
SMC Sciences Mission Directorate
SMC Sensor Management Council
SMC Strategic Management Council
SMCDS Space Mission Communications and Data Services
SMD Science Mission Directorate
SMD Space and Missile Defense
SMD JAT Space and Missile Defense Joint Analysis Team
SMDR Station Message Detail Reporting
SMDS Statistical Multiplexer Data System
SMDS Switched Multimegabit Data Service
SME Scan Mirror Electronics
SME Subject Matter Expert
SMEX Small Explorer
SMG Spectrum Managers' Group
SMGM Spectrum Managers Group Meeting
SMMR Scanning Multichannel Microwave Radiometer 
SMO Systems Management Office
SMP System Management Policy
SMS Shuttle Mission Simulator
SMTF Shuttle Mission Training Facility
SMTF Software Maintenance and Training Facility
SMTP Simple Mail Transport Protocol
SN Space Network
SN/GN Space Network/Ground Network
SNA System Network Architecture
SNAP Systems and Networks Architecture Project
SNAS Space Network Access System
SNE Space Network Expansion
SNGS Space Network Ground Segment
SNIP Space Network Implementation Plan
SNIP Space Network Interoperability Program
SNIS Space Network IP Services
SNL Sandia National Laboratory
SNM Space Network Modernization
SNOE Student Nitric Oxide Explorer
SNQR Space Netowrk Quarterly Review
SNR Signal Noise Ratio
SNR Signal to Noise Ratio
SNUG Space Network User's Guide
SOA Statement of Assurance
SOARS Spacecraft Orbital Anomaly Reporting System
SOC Science Operations Center
SOC Science Operations Coordination
SOC Simulation Operations Center
SOC Space Operations Council
SOCB Space Operations Change Board    
SOCB Space Operations Control Board
SODA Space Operations Directive Agreement
SOE Sequence of Events
SOE Standard of Excellence
SOFIA Stratospheric Observatory for Infrared Astronomy
SOHO Solar Observatory for  Heliospheric Observatory
SOLAR NASA Site for Online Learning and Resources
SOLAR-A (Japanese solar research satellite)
SOLC Space Operations Learning Center
SOMD Space Operations Mission Directorate
SOMO Space Operations Management Office
SONET Synchronous Optical Network
SOP Standard Operating Procedure
SORCE Solar Radiation and Climate Experiment
SORD Support Operations Requirements Document
SORR Stage Operations Readiness Review
SOS Science on a Sphere
SOS System of Systems
SOST Space Operations Streamlining Team
SOTA Special Operations and Testing Area
SOW Statement of Work
SP Solar Probe
SP&M Special Projects and Missions
SP&OD Suborbital Projects and Operations Directorate
SPA Shuttle Processing Area
SPAN Space Physics Analysis Network 
SPAN Spacecraft Analysis (JSC)
SPC Signal Processing Center
SPCB Scan Program Change Board
SPD Space Product Development
SPDMS Shuttle Processing Data Management System
SPF Service Providing Facilities
SPF Software Production Facility
SPG Strategic Planning Guidance
SPI Schedule (Work) Performance Index
SPICE Space Program Integrated Contract Environment
SPIF Shuttle POCC Interface Facility
SPIF-RS SPIF - Replacement System
SPIP SSP's Process Integrity Plan
SPIP Strategic Program Implementation Plan
SPjM Sub-Project Managers
SPM Service Performance Metrics
SPMC Software Production Management & Control (JPL)
SPO Shuttle Program Office
SPOC Shuttle Payload of Opportunity Carrier
SPOT Satellite Pour l'Observation de la Terre
SPP SCaN Program Plan
SPR Software Problem Report
SPS Service Planning Segment
SPS Spectrum Planning Subcommittee (under the IRAC)
SPSR Service Planning Segment Replacement
SPT System Performance Test
SPTR South Pole TDRSS Relay
SQIF Superconducting Quantum Interference Filter
SR Service Request
SR Support Requirements
SRA Sequential Ranging Assembly
SRB Solid Rocket Booster
SRB Standing Review Board
SRB Systems Review Board
SRD Systems Requirements Document
SRPM Sun Reference Pointing Mode
SRR System Readiness Review
SRRE Search Rescue and Recovery Element
SRS Service Request System
SRS Software Requirements Specification
SRS Systems Requirements Specification
SRT System Readiness Test
SRTM Shuttle Radar Topography Mission
SRTM Shuttle Radar Topography Mission
SS7 Signaling System 7
SSA S-band Single Access
SSA Symbol Synchronizer Assembly
SSAF S-band Single Access Forward
SSAR S-band Single Access Return
SSAS Service Scheduling Applications Software
SSBUV Shuttle Solar Backscatter Ultraviolet
SSC Station Support Computers
SSC Stennis Space Center
SSC Swedish Space Corporation
SSDR Subsystem/Software Design Review
SSE Solar System Exploration
SSE Space Science Enterprise
SSEO Solar System and Earth-Observing
SSEO Space Science and Earth Observation
SSEO Space Science and Earth Observing
SSF Support Service Facilities
SSF System Support Facility
SSFDR Subsystem/Software Functional Design Review
SSFO Space Shuttle Flight Office
SSG Space Systems Group (old term, now SSS)
SSI Server Side Include
SSL Secure Socket Layer
SSM/I Special Sensor Microwave/Imager
SSM/I Special Sensor Microwave/Imager
SSO Source Selection Official
SSO Space Shuttle Orbiter
SSP Space Shuttle Program
SSPF Space Station Processing Facility
SSR Satellite Situation Report
SSR Solid State Recorder
SSRE Search Rescue and Recovery Element
SSS Space Systems Subcomittee (under the IRAC)
SSTF Space Station Training Facility
SSU Space Shuttle Upgrades  
SSV Space Service Volume
ST Senior Scientific and Technical
ST Space Telescope
ST-DCF Hubble Space Telescope-Data Capture Facility
STA Shuttle Training Aircraft
STADAN Satellite Tracking and Data Acquisition Network
STARDUST Space Dust Analysis Mission
STARLink Satellite Telemetry & Return Link
Std Standard
STDN Spaceflight Tracking and Data Network
STE Secure Telephone Equipement
STel Stanford Telecommunications Corporation
STEM Science, Technology, Engineering and Mathematics
STEP Space Test Experimental Platform
STEREO Solar TErrestrial RElations Observatory
STGT Second Tracking and Data Relay Satellite System Ground Terminal
STI Scientific and Technical Information
STIC Scientific and Technical Information Center
STK Satellite Tool Kit
STOL Spacecraft Test and Operations Language
STP SCaN Transition Plan
STP Space Test Program
STPS Software Telemetry Processing System
STRCS Space Transportation Reimbursable Cost System
STRS Space Telecommunications Radio System
STRV Space Technology Research Vehicle
STS Shuttle Transportation System
STS Space Transportation System
STS Space Transportation System
STS Synchronous Transport Signal
STScI Space Telescope Science Institute
STSI Space Telescope Science Institute
STTR Small business Technology TRansfer
STU Secure Telephone Unit
SUCCESS Subsonic Contrails and Clouds Effects Special Study
SUNSAT Stellenbosch University Satellite
SV Schedule (Work) Variance
SV Space Vehicle
SVA Svalbard
SVC Switched Virtual Circuits
SVEL Service Element
SVLBI Space Very Long Baseline Interferometry
SVO Special Vehicle Operations
SVS Switched Voice Service
SVU SAP Version Upgrade
SW Space Wing
SWAP Size, Weight, and Power
SWAPRA South West Aerospace Professional Representatives Association
SWAS Submillimeter Wave Astronomy Satellite
SWG Sub-Working Group
Swift Swift Gamma Ray Burst Explosion
SWIR Short Wave Infared
SWSI Space Network Web Services Interface
Sync Synchronizer
SZA Solar Zenith Angle
Acronym Description
T&CD Timing and Countdown
T&DA Tracking & Data Acquisition
T&E Test and Evaluation
TA Task Agreements
TA Technical Authorities
TAC Telemetry and Command
TACAN Tactical Air Navigation
TAG Technology Advisory Group
TAL Transatlantic Abort Landing
TAP Telemetry Acquisition Processor
TAP Tracking Acquisition Processor
TARS Test Analysis Retrieval System
TASP Test and Simulation Processor
TASS TDRSS Augmentation Satellite Service
TBD To Be Determined
TBR To Be Resolved
TBS To Be Supplied
TC Technical Committee
TCA Telemetry Channel Assembly
TCA Transformational Communications Architecture
TCDS Telemetry Data Processors
TCDT Terminal Count Down Test
TCFEP Telemetry and Communication Front-End Processor
TCH. POC Technical Point of Contact  
TCI Technical Control Instrumentation
TCIR Safety Total Case Incident Rate
TCM Trim Correction Maneuvers
TCOPS Trajectory Computation and Orbital Products System
TCP Transmission Control Protocol
TCP/IP Transmission Control Protocol/Internet Protocol
TCR Training Control Room
TCS Transformational Communications System
TCWG Technical Capability Working Group
TD Technical Direction
TDA&C Telemetry, Data Acquisition, and Command
TDAC Tracking, Data Acquisition, and Command
TDD Task Description Document
TDD Technical Description Document
TDF TPOCC Development Facility
TDM Time Division Multiplexing
TDMA Time Division Multiple Access
TDR Top Directorate Risk
TDRS Tracking and Data Relay Satellite
TDRS-E Tracking and Data Relay Satellite - East
TDRSS Tracking and Data Relay Satellite System
TDS Time Distribution System
TDS Tracking Data System
TDSD TDRS Digital Signal Distribution
TECCS Test and Evaluation Command and Control System
TELOPS Telemetry On-line Processing System
TERRA A Spacecraft formerly called Earth Observing Spacecraft (EOS) AM-1
TERRIERS Tomographic Experiment using Radiative Recombinative Ionospheric EUV and Radio Sources
TES Tropical Emission Spectrometer  
TFCR Training Flight Control Room
TFE Telos
TGA Telemetry Group Controller
TGT TDRSS Ground Terminal
THERE TDRSS High-rate Equipment Replacement and Enhancement
TIA Technical Implementation Agreement
TILT TDRSS Internet Link Terminal
TIM Technical Interchange Meeting
TIMED Thermosphere, Ionosphere, Mesosphere, Energetics and Dynamics
TIMWOOD Transportation, Inventory, Motion, Waiting, Overprocessing, Overproduction, Defects
TIN Taxpayer Identification Number
TIOP TIPIT Input/Output Port
TIP Technical Implementation Plan
TIP Technical Information Program
TIP Things in Progress
TIP Transition and Implementation Planning
TIPIT TDRSS Interface Preprocessor Into the TELOPS
TIPLAB Technical Information Program Laboratory
TIROS Television Infrared Observational Satellite  
TISA Time Interpolation and Spatial Averaging  
TIV&V Transition, Integration, Verification, and Validation
TKUP TDRS K-Band Upgrade Project
TL Team Leader
TLAN TPOCC Local Area Network
TLAS TDRSS Look Angle System
TLC Trans Lunar Cruise
TLE Two Line Element
TLI Trans Lunar Injection
TLM Telemetry
TM Technical Memorandum
TM Technical Monitor
TM Thematic Mapper
TMA Telemetry Annex
TMOC TOMS-EP Mission Operations Center
TMOD Telecommunications and Mission Operations Directorate (JPL)
TMP Technology Management Plan
TMP Travel Manager Plus
TMR Technical Management Representative
TMR Technical Manager's Representative
TMS Telecommunication and Mission System
TMT Technology Management Team
TNOC TDRS Network Opeartions Control
TOCC TDRS Operations Control Center
TOCC TDRSS Operations Control Center
TOGA Tropical Ocean Global Atmosphere
TOMS Total Ozone Mapping Spectrometer
TOMS-EP Total Ozone Mapping Spectrometer-Earth Probe
TOPEX The Ocean Topography Experiment
ToR Terms of Reference
TOR TPOCC Operations Room
TOS Transfer Orbit Stage
TOTS Transportable Orbital Tracking Station
TOTS Transportable Orbital Tracking System
TPC Technical Performance Commitments
TPCE Telemetry Processing Control Enviroment
TPF Telemetry Processing Facility
TPM Technical Performance Metrics
TPOCC Transportable Payload Operations Control Center
TPR Top Program Risk
TProjR Top Project Risk
TQM Total Quality Management
TR Tape Recorder
TR Transition Readiness
TR Transition Review
TRACE Transitional Region and Coronal Explorer
TRACE DPS Transitional Region and Coronal Explorer Data Processing System
TRAPS Telemetry & Radar Acquisition Processing Systems
TRK Track
TRK Tracking
TRK# Tracking Number  
TRL Technology Readiness Level
TRMM Tropical Rainfall Measuring Mission
TRR Test Readiness Review
TSA Telemetry Simulator Assembly
TSA Transportation Security Agency
TSB Technical Support Building
TSC Technical Subcommittee (under the IRAC)
TSD Technology and Standards Development Division
TSDIS Time Sensitve Data Information System
TSO Technical Support Office
TSSF Tape Staging and Storage Facility
TT&C Telemetry, Tracking and Command
TTAC Transportable Telemetry and Command
TTR TDRSS Trouble Report
TTR Time to Restore
TURFTS TDRSS User Radio Frequency Test Set
TUT TDRSS Unused Time
TV Television
TV Test and Verification
TVOC Television Operations Center
TWG Technology Working Group
TWP Transition Work Plan
TWT Traveling Wave Tube
TWTA Traveling Wave Tube Amplifier
Acronym Description
U-NII Unlicensed National Information Infrastructure Devices
UAF University of Alaska Fairbanks
UARS Upper Atmosphere Research Satellite
UAS Unmanned Aeronautical Systems
UAV Unmanned Aerial Vehicles
UB Undistributed Budget
UCAR University Corporation for Atmospheric Research
UCAV Unmanned Combat Air Vehicle
UCSS UARS CDHF Software System
UDC Utilization Development Capability
UDP User Datagram Protocol
UDS Universal Documentation System
UELV Unmanned Expendable Launch Vehicle
UF Utilization Flight
UFR UnFunded Requirements
UHF Ultra-High Frequency
UK United Kingdom
ULA Unified Labor Account
UM UARS Missions
UMA University of Massachusetts
UMD University of Maryland at College Park
UMS Utilization and Mission Services
UN United Nations
UNEX University Explorers
UNI User to Network Interface
UNITeS Unified NASA Information Technology Services
UOA User Operations Area
UOF User Operated Facility
UON Universal Operations Network
UPD User Performance Data
UPN Unique Project Number
UPN Universal Product Number
UPS Uninterruptible Power Supply
UPS User Planning System
UQPSK Unbalanced Quadrature Phase-Shift Keying
URL Uniform Resource Locator
US United States
US Upper Stage
USA United States of America
USA User Service Access
USAF United States Air Force
USAID U.S. Agency for International Development
USB Unified S-Band
USC United States Code
USCCS User Spacecraft Clock Calibration Service
USCG United States Coast Guard
USDA U.S. Department of Agriculture
USG United States Government
USGS U.S. Geological Survey
USM Unit of Service Metric
USM Utilization Service Metrics
USMP U.S. Microgravity Payload
USN United Space Network
USN United States Navy
USNA United States Naval Academy
USNO United States Naval Observatory
USOC United States Operations Center
USS User Services Subsystem
USS User Services System
USS-CR User Services Segment Component Replacement
USSPACECOM United States Space Command
USSR  User Service Subsystem Replacement
UST universal space transponder
USTAG US Technical Advisory Group
UTC Universal Time Coordinated
UTDF Universal Tracking Data Format
UTELOPS Upgraded Telemetry On-line Processing System
UV Ultraviolet
UWB Ultra-Wideband Systems
UWI Unique Work Instruction
Acronym Description
V&V Verification & Validation
VAB Verticle Assembly Building
VABR Vertical Assembly Building Repeater
VAC Variance at Completion
VAFB Vandenberg Air Force Base
VAMS Video/Audio Mastering System
VAR Variance Analysis Report
VASS ViTS Automated Scheduling System
VAX Virtual Address Extension
VC Viet Cong
VC Virtual Channel
VC/MC Virtual Channel/Master Channel 
VCC Video Control Center
VCDU Virtual Channel Data Unit
VCID Virtual Channel Identifier
VCL Vegetation Canopy Lidar
VCP Virtual Channel Packet
VCR Video Cassette Recorder
VDMS Voice Distribution Management System
VDS Voice Distribution System
VHF Very High Frequency
VHF Video High Freqency
VIIRS Visible Infrared Imaging Radiometer Suite
VIP Very Important Person
VISSR Visible and Infrared Spin Scan Radiometer
ViTS Video Teleconferencing Service
ViTS Video Teleconferencing System
VLBA Very Long Baseline Array
VLBI Very Long Baseline Interferometry
VLSI Very Large Scale Integration
VME Virtual Memory Extension
VMS Virtual Memory System
VNIR Visible & Near Infared
Vol Volume
VON Virtual On Net
VOR Vehicle Operations Room
VoTS Voice Teleconferencing Service
VoTS Voice Teleconferencing System
VPF Verticle Processing Facility
VPN Virtual Private Network
VPP Voluntary Protection Program
VPPPA Voluntary Protection Program Participants Association
VRML Virtual Reality Modeling Language
VSE Vision for Space Exploration
VSM Value Stream Mapping
VSOP VLBI Space Observatory Program
VSS Voice Switching System
VTC Video TeleConference
VTCC Video Teleconferencing Control Center
VVC Virtual ViTS Connection
VZA Viewing Zenith Angle
Acronym Description
W/G Working Group
WA Workmanship Assurance
WAAS Wide Area Augmentation System
WAC WRC Advisory Committee
WAD Work Authorization Document
WAN Wide Area Network
WARP Wideband Advanced Recorder Processor
WART White Sands Auxiliary Remote Tracking
WART WSC Alternate Relay Terminal
WATR Western Aeronautical Test Range
WAVE WWW, Artificial Intelligence, and Virtual Environments Exploration
WBC Wide Band Correlator
WBS Work Breakdown Structure
WCB Wide Channel Bandwidth
WCF Working Capital Fund
WCRP World Climate Research Program  
WFC Wallops Flight Center
WFF Wallops Flight Facility
WFOV Wide Field of View
WGS Wallops Ground Station
WI Work Instruction
WIMS Workforce Integrated Management System
WIND Project namd for Interplanetary Physics Laboratory
WIND Solar Wind Observer
WIP Work In Progress
WIRE Wide-Field Infrared Explorer
WLG Working Level Group
WLG-E Working Level Group - Engineering Analysis and Technical Assessments
WLPS Wallops
WMO World Meteorological Organization
WOSB Woman-Owned Small Business
WOTIS Wallops Orbital Tracking Information System
WOTS Wallops Orbital Tracking Station
WOTS Wallops Orbital Tracking System
WP Working Party
WP4A Working Party 4A - Efficient orbit/spectrum utilization (under SG 4)
WP7A Working Party 7A - Time signals and frequency standard emissions
WP7B Working Party 7B - Space radio systems
WP7C Working Party 7C - Earth-exploration satellite systems and meteorological elements
WP7D Working Party 7D - Radio astronomy
WP7E Working Party 7E - Inter-service sharing and compatibility (disbanded)
WPET Work Package Evaluation Team
WR Western Range
WRC World Radiocommunications Conference
WRF Working Capital Fund
WSC White Sands Complex
WSGT White Sands Ground Terminal
WSMR White Sands Missile Range
WSO Wallops Scheduling Office
WSSH NS White Sands Space Harbor (Northrup Strip)
WSTF White Sands Test Facility
WSTF White Sands Training Facility
WWS World-Wide Standards
WWW World Wide Web
WYE Work Year Equivalent
Acronym Description
XML eXtensible Markup Language
XNS Xerox Network Systems
XTCE XML Telemetric and Command Exchange
XTE X-Ray Timing Explorer
Acronym Description
Y2K Year 2000
Y2K+1 Year 2001
YTD Year-to-Date
Acronym Description
ZBR Zero Base Review
ZOE Zone of Exclusion
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Page Last Updated: April 15th, 2014
Page Editor: Thuy Mai