IARU Amateur Satellite Frequency Coordination

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ESTCube-2 Updated: 06 Feb 2018   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. The primary transceiver is using 70 cm amateur radio band for uplink and downlink purposes. It will be used to as the beacon for simple overview of the satellite status and as the main transceiver for receiving tele-commands 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 telemetry beacon periodically, typically once per minute, containing packets from every subsystem. After special planned request, low resolution image thumbnails will be transmitted. As part of Estonian educational campaign satellite will transmit digital file and/or analog NBFM signal. 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. The optional Doppler ranging experiment will be used to determine satellite distance to Earth in order to improve accuracy of satellite orbit determination. 2m amateur band as uplink and 70 cm amateur band as downlink is used for Doppler ranging method. In addition, on-board the satellite is placed a corner reflector for possible optical ranging. High-speed communications system is an experimental transceiver system, which is developed as spectrally efficient communication system 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 signa. GNU radio based software tools will published before satellite launch, in order to enable reception of high speed downlink for amateur radio community. 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 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. More info here https://drive.google.com/file/d/0B-TI7NbeuNSuUjcwSUhBTEg5UGc/view No launch opportunity has been identified but planning a 2019 deployment into a SSO.
Application Date: 03 Feb 2018   Freq coordination completed on

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