IARU Amateur Satellite Frequency Coordination
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IARU Amateur Satellite Frequency Coordination |
| HORYU-4 | Updated: 03 Feb 2016 | Responsible Operator | Atomu Tanaka JG6YBW | |
| Supporting Organisation | Kyushu Institute of Technology | |||
| Contact Person | n350912a@mail.kyutech.jp.nospam | |||
| Headline Details: HORYU-IV is a cubic-shaped nano-satellite with external dimensions of 490mm×490mm×495mm and an approximate mass of 10kg.HORYU-IV’s main mission is to measure discharges current waveforms and capture images of the discharges occurring on solar cells. Both objectives, if achieved successfully, will be a world premiere, and the results will greatly improve our knowledge on surface charging phenomenon and eventually spacecraft reliability.In addition to the main mission, nine (9) other missions are on-board HORYU-IV: 1) high voltage solar array (HVSA); 2) Experiment on discharge induced degradation (DEG); 3) double Langmuir probe (DLP); 4) vacuum arc thruster (VAT); 5) electron-emitting film (ELF); 6) secret ink (INK); 7) photo-electron current measurement (PEC); 8) camera for Earth photography (CAM); 9) digi-singer (SNG). HVSA mission aims at generating high voltage to bias dedicated solar cells at -300V for on-orbit evaluation of discharge mitigation methods (solar cells covered with either film or coating) DEG mission aims at verifying, on-orbit, whether discharge occurring on solar arrays can result in a decrease of their output power efficiency or not. DLP mission aims at measuring plasma density and temperature. VAT is a trigger-less thruster technology demonstration mission that uses HVSA (300V or more) for ignition instead of a booster circuit. ELF mission aims at verifying that electrons can be passively emitted when being negatively biased to -300V. INK mission aims at studying polymer film degradation in space environment by taking photos of the base material (under polymer film), which is silver coated (upon oxidation, will become darker and darker). PEC mission aims at measuring, on-orbit, photo-electron current from metallic and insulator surface using the AM0 spectrum. CAM uses a CMOS module and aims at capturing images of the Earth upon external user request. The image could be widely distributed and be used as educational material on the utilization of space. This mission has both research and outreach objectives. The images will indeed be distributed to junior and high school students to foster space-based science, technology, engineering, and mathematics (STEM) education. SNG mission is an outreach oriented mission. First, music in MIDI format is uploaded from ground. Then the MIDI file is processed on-board HORYU-IV using a vocal synthesizer Finally, the processed music is sent back to Earth using UHF antenna as voice FM data. During organized events on space utilization with schools or general public, music could be heard using a common receiver and hand-made yagi antenna. As for the camera mission, SNG has therefore both research and outreach objectives. In addition to the main mission, nine (9) other missions are on-board HORYU-IV: 1) high voltage solar array (HVSA); 2) Experiment on discharge induced degradation (DEG); 3) double Langmuir probe (DLP); 4) vacuum arc thruster (VAT); 5) electron-emitting film (ELF); 6) secret ink (INK); 7) photo-electron current measurement (PEC); 8) camera for Earth photography (CAM); 9) digi-singer (SNG). HVSA mission aims at generating high voltage to bias dedicated solar cells at -300V for on-orbit evaluation of discharge mitigation methods (solar cells covered with either film or coating) Using amateur radio, HORYU-IV would like to use the five signals described below. 1. Central frequency 437.375MHz (bandwidth: 500Hz) – CW beacon at 20wpm. 2. Central frequency 437.375MHz (bandwidth: 26kHz) – GMSK, FM data backup (FM data are missions’ data and OTHK), 9600bps. 3. Central frequency 437.375MHz (bandwidth: 16kHz) – AFSK, FM data (FM data are RTHK and backup for mission data and OTHK), 1200bps. 4. Central frequency 437.375MHz (bandwidth: 16kHz) – F3E, digi-singer mission data. 5. Central frequency 2400.3MHz (bandwidth: 400kHz) – BPSK, main FM data (FM data are missions’ data and OTHK), 100kbps. Planning a launch during 2015 from the JAXA Tanegashima Space Center into a circular 575km orbit with a 31 degree inclination. More information from http://kitsat.ele.kyutech.ac.jp/horyu4WEB/horyu4.html ** The frequencies shown above have now been coordinated** ** A launch date of Feb 12th 2016 has now been advised** | ||||
| Application Date: | 30 Oct 2014 | Freq coordination completed on | 23 Dec 2014 | |
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