Study of Transmit/Receive Radio Signal Conditions in the Russian Segment of ISS Using the World-Wide Ham Radio Network (Ten-Mayak (Shadow-Beacon)) - 05.13.15

Overview | Description | Applications | Operations | Results | Publications | Imagery

ISS Science for Everyone

Science Objectives for Everyone
Ten'-Mayak (Shadow-Beacon) uses the onboard ham radio to send time stamped VHF information packets which are received and recorded by amateur receiving stations around the world. The activity will be repeated when Russia does test firings of a planned plasma engine to understand the extent that the artificial plasma generated blocks the transmissions.
Science Results for Everyone
A ham radio aboard the station sent time-stamped radio-signal information packets to amateur receiving stations around the world. Researchers analyzed the quality of the signals and effects of disturbances such as shading and elevation of the station. Many participants received the signals and transmitted data on their time, place, and characteristics via the internet. Researchers evaluated the effect of the non-uniformity of the ground reception network on the accuracy of space and time measurements and created maps of coverage areas for measurement orbits. This provides a new tool to increase the timeliness and effectiveness of managing ground measuring networks.

The following content was provided by O. M. Alifanov, and is maintained in a database by the ISS Program Science Office.
Experiment Details


Principal Investigator(s)
O. M. Alifanov, International Educational-Research Center Cosmos

Information Pending

Information Pending

Sponsoring Space Agency
Russian Federal Space Agency (Roscosmos)

Sponsoring Organization
Information Pending

Research Benefits
Information Pending

ISS Expedition Duration
September 2006 - March 2013

Expeditions Assigned

Previous ISS Missions
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Experiment Description

Research Overview
Information Pending

Study of USH-radio signal transmit/receive conditions in the mode of onboard radio beacon in the ISS RS using world-wide ham radio network. Determining characteristics of radio Signals retransmitted through onboard transceiver, their quality and spatial distribution. Assessment of disturbing actions, such as re-reflection, shading caused by structural elements and value of the ISS elevation angle.

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Space Applications
Information Pending

Earth Applications
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Operational Requirements
Complex of amateur packet radio communication set with 145/430 MHz frequency range:

    4 antenna feeder devices
    2 power supply units<
    controlling computer

Operational Protocols
Generation of onboard radio beacon probing pulses as time marks to ground receiving network (including ham radio receivers of USW) and transmission of the measurement results throughout Internet network. Check of the concept of forced radio silence in the mode of short-packet generation by radio communication Protocol AX25. Determining of ISS structural members effect on onboard antenna directional pattern (DP) in flight conditions. Determining zones of DP radio shadowing zones by the station structural members depending upon its spatial orientation. Assessment of ground receiving network non-uniform sensitivity on accuracy in spatial-time measurements. Determining of ground receiving network radio visible configurations depending upon an angle of elevation and light-shadow situation along the flight course.

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Results/More Information

Files containing data on the recorded radio signals (time, place, frequency-phase characteristics) transmitted through Internet from each ground-based receiver within measurement USW network at the address of the Center for Scientific Data Acquisition and Processing.

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Related Websites
Energia - Science Research on the ISS Russian Segment

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