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
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.
|Beacon||145.9 MHz|| CW 40 / 80
AFK AX25 1200
GMSK AX25 RS Convolution 9600
GMSK AX25 RS Convolution 13600
4FK AX25 RS Convolution 19200
|Transponder Name||Mode||Frequency Uplink||Frequency Downlink||Inverted||CTSS Tone|
|Digital Repeater ?||436.5 MHz||145.9 MHz|