IARU Amateur Satellite Frequency Coordination

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Magnaro A & B Updated: 20 May 2021   Responsible Operator Takumi Noro JJ2YVW
Supporting Organisation Nagoya University  
Contact Person noro.takumi@d.mbox.nagoya-u.ac.jp.nospam  
Headline Details: A 3U Cubesat mission splitting into a 2U and a 1U after launch. 1. Extended communication distance by relay through two satellites in formation flight Communication message relay by two satellites in formation flying (Mission 2) allows extended range for various experiments of long-range communication by amateur radio (long-range repeater). Two satellites, MAGNARO-A and B, share the information of housekeeping data in each satellite and the messages to be relayed. On-board Communication systems for communication with ground station are also used for inter-satellite communication. MAGNARO-A will receive AX.25 packets set in UNPROTO with MAGNARO-A and MAGNARO-B as the path. MAGNARO-A satellite receives packets transmitted from ground station in even minutes and MAGNARO-B satellite only transmits in odd minutes in order to minimize the interference between uplink and downlink. The details of the protocol will be published together with the mission status in the official website 2. Formation flight Propellant-less formation flight using high-spin deployment and differential atmospheric drag. In this formation flight, two satellites (MAGNARO-A and B) are initially connected magnetically, and separated to make a formation in-orbit for armature Inter-satellite communication. The satellites relative orbits are actively controlled with atmospheric drag force, and the relative attitude is actively controlled with magnetic torque by MTQ. In the formation flight, the orbit is determined using GPS, and the attitude is determined using both magnetometer and Sun sensor. With these methods, nanosatellites can easily achieve formation flight and provide inter satellite communication capability. Key demonstration for energy efficient technology, which allows long-range communication for Mission 1.MAGNARO mission provides longer range amateur communication service than the range provided by a single satellite, which provides unique training and technical investigation opportunities. MAGNARO is a unique satellite with spin separation and capability of formation flying (formation range varied from 2km to 500km). The satellites in formation flight allow communication relay through inter-satellite link which extends communication range by thousands of kilometers. This feature allows the amateur telemetry? community to test communication relay technology on nanosatellite platforms. Any amateur operators can use MAGNARO-A and B as repeaters by sending AX.25 packets in UNPROTO when this feature is enabled. Proposing a UHF downlink using CW, 1k2 AFSK 9k6 and 19k2 GMSK. Also space to space link using 1k2 AFSK on VHF and UHF. Planning a launch from Uchinoura in late 2022/early 2023 into a 550km SSO. More info from http://nanosat.nuae.nagoya- u.ac.jp/research_nanosat_en.html **Downlinks on 145.850 MHz and inter-satellite links on 145.850 MHz and 436.325 MHz have been coordinated for both spacecraft**
Application Date: 25 Apr 2021   Freq coordination completed on 20 May 2021

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