OPUSAT-II(Hirogari)

Detailed Information

Link : Project site

Demonstration of high-speed data transmission in amateur radio band ~”EXPAND” the reach of amateur radio~ Many of the nano-satellites launched so far adopted the data transmission rates of 1200 or 9600 bps in the UHF or VHF amateur radio bands. In this mission, we will downlink data not only with 1200 bps AFSK and 9600 bps GMSK but also with 13600 bps GMSK and 19200 bps 4FSK. Conventional amateur radio satellites mainly use the AX.25 protocol, which requires re-transmission requests from earth stations in case of packet loss, which makes the satellite operation costly. In HIROGARI project, we will demonstrate a protocol using Reed-Solomon encoding and convolutional processing with error correction capability. We will conduct communication experiments to evaluate capability of each protocol and investigate which protocol is suitable for nano-satellite operation. We will also conduct communication experiments to evaluate the usefulness of these communication systems. If those communication systems are verified to be useful, satellites using amateur radio band will be able to communicate more efficiently. The results of the experiment and the design of the satellite’s communication system and the earth station system will be available on our homepage so that amateur radio operators around the world can use this high-speed communication technology to improve the communication technology for amateur radio satellites.