Study of Transmit/Receive Radio Signal Conditions in the Russian Segment of ISS Using the World-Wide Ham Radio Network (Ten-Mayak (Shadow-Beacon)) - 10.25.17

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 - April 2009; September 2010 - March 2013

Expeditions Assigned

Previous 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 and Protocols
Complex of amateur packet radio communication set with 145/430 MHz frequency range:

    4 antenna feeder devices
    2 power supply units<
    controlling computer

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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Decadal Survey Recommendations

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Results/More Information

During the experiment, sounding packets from the on-station radio beacon in the form of time tags were emitted and received by the ground reception network, which included amateur VHF receivers, and the measuring results were broadcast on the Internet. Numerous reports on the receipt of data from participants were sent to the information collection center. The data received was processed and classified. The effect of the non-uniform sensitivity of the ground reception network was evaluated for the accuracy of space and time measurements when applying this procedure of the satellite coverage area radio sounding. Maps of coverage areas for measurement orbits were compiled. In this series of Ten-Mayak experiments, a new tool was developed to increase the timeliness and effectiveness of ground measuring network management, specifically a special Ten-Mayak experiment site that is part of the Roscosmos scientific/technical coordination board’s portal allowing the automatic registration of experiment participants and the real-time distribution of urgent notifications and news.

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Related Websites
Energia - Science Research on the ISS Russian Segment

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