IARU Amateur Satellite Frequency Coordination
|Updated: 20 Jul 2023
|Mitsuharu Shiwa JS1YCW
|Institute of Future Science Happy Science University
|Headline Details: A 1U CubeSat. The missions are 1. Camera image is downlinked by Slow Scan Television. The camera takes a photograph of the Earth. Image pixel size is 320x240. The photograph taken is converted into analog SSTV signal, transferred to Communication (hereinafter called "COM") , and sent by FM-SSTV downlink. 2. Earth observation by multispectral camera Wavelength: B(446nm), G(532nm), R(646nm), NIR(750nm) Resolution: 752pixel×480pixel Observation range : 423km×270km Surface resolution: 562m×562m Size: 0.5U 3. Operation demonstration of the unitization (packaging) of bus equipment for CubeSat installation 4. Laser reception experiment Laser uplink from ground station by infrared remote-control method Orbit altitude: 540km Transmission method: IR remote control format One of the missions of FSI-SAT2 is "Downlink of Earth Images by SSTV" by amateur radio. First, the satellite will be attitude controlled to point the onboard camera to the earth, and then the camera will take pictures and save the images to the SD card. After that, the stored images are converted to SSTV audio signals using the DDS (Direct Digital Synthesizer). When a DTMF request signal for SSTV transmission from a general amateur radio station is received, the satellite responds to the DTMF signal and downlinks the SSTV audio signal. This DTMF request signal is published on the Web page in advance, and general radio amateurs can send this DTMF request signal so that they can receive the SSTV signal from the satellite at any time. The SSTV audio signal received at the ground station can be transferred to a PC and decoded into an image using the installed SSTV conversion software to receive a picture of the earth taken by the satellite. The SSTV can be converted using free software available on the Web, and the download link and instructions for using the software will be posted on the FSI-SAT2 Web page along with the mission overview. FSI-SAT2 will be operated for the purpose of education and technical study, and at the same time, its functions will be released to general radio amateurs, which is in line with the public interest and public nature indicated in the amateur service. More info from https://drive.google.com/file/d/1-7e-eHPWRm-fdF6GIbiP-lRZmghy9H3A/view?usp=sharing Proposing a UF downlink with 18.5 wpm CW Analogue SSTV 1k2 AFSK and 9k6 GMSK. Planning a JAXA launch into a 540km polar orbit.
|19 Jul 2023
|Freq coordination completed on
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