IARU Amateur Satellite Frequency Coordination

 
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ESTCube-2 Updated: 30 Jun 2020   Responsible Operator Tõnis Eenmäe ES5TF
Supporting Organisation Institute of Physics, University of Tartu  
Contact Person es5ec@estcube.eu  
Headline Details: ESTCube-2 is a 3U Cubesat. ** A updated request has been received....Amateur missions: ● In-orbit signal strength mapping in the 2 m and 70 cm amateur bands will be performed, using periodical full band RSSI measurements in order to check how polluted these two radio amateur bands are in low Earth orbit. ● The Digipeater mode will be used to allow amateur radio operates to use satellite for two-way digital communication. 9600 bps GFSK AX.25 data uplink will be in 2m amateur band and transmission of digipeated packet in 70 cm radioamateur band. Transmission speed and mode will be the same as for uplink. ● High-speed communications system is an experimental transceiver system, which is developed as spectrally efficient communication system [ link ]. During experiment stage system will downlink data in 5 GHz amateur radio band, where possible data will be satellite status packets, experiment data and full resolution images from Earth observation camera. Data will be downlinked starting with BPSK modulated 9600 bps data-rate up-to 32APSK modulated 25 Mbps data-rate signal (see ITU designator list). GNU radio based software tools will published before satellite launch, in order to enable reception of high speed downlink by amateur radio community. ● The optional multi-station radio frequency ranging experiment will be used to determine satellite distance to Earth in order to improve accuracy of satellite orbit determination. For experiment, 70 cm radio amateur band as downlink and 4 or more amateur ground stations using SDR-based equipment that can provide stable and accurate frequency and time measurements, will be used. Non-amateur missions: ● Primary transceiver is using 70 cm amateur radio band for uplink and downlink purposes. It will be used to as the housekeeping beacon for simple overview of the satellite status and as the main transceiver for receiving telecommands and firmware upgrades. As well transmitting large amounts of mission data, like telemetry data from each subsystem and the experiment data in AX.25 data packet format with 9600 baud data-rate FSK/GFSK modulated signal with experimental changing frequency up-to 38600 baud using 2GFSK (or 4GFSK for testing) modulation schemes. During mission, it is planned to transmit housekeeping telemetry beacon periodically, typically once per minute, containing overview packets from every subsystem. After special planned request, low resolution thumbnails from Earth imager will be transmitted. ● Satellite will transmit digital file and/or analog NBFM signal containing pre-recorded audio greetings from space. This activity will infrequently take place according to a schedule published publicly to schools and AMSAT/HAM community. That signal can be received by participating Estonian primary and secondary schools, using their own built radio antennas and SDR-based receiver systems. That activity is targeted primarily to promote amateur radio and satellite communication (and in general STEM fields) among the younger generation. ● 70 cm amateur radio band downlink will be used to send E-sail tether experiment and housekeeping data of the payload module such as temperature measurements, information about the attitude of satellite, energy production etc. ● After performing measurements of a material science experiment on corrosion resistant coating and radiation shielding material, 70 cm amateur radio band downlink will be used to transmit acquired sensor data. Sensors will measure resistance, temperature and integrated radiation accumulated while exposed to space environment during one or multiple orbit periods. No launch opportunity has been confirmed****Further information has been requested from the group**
Application Date: 03 Feb 2018   Freq coordination completed on

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