2025 Volume 3 Article ID: 229
The University of Tokyo has been developing two 6U CubeSats. One satellite is named “SPHERE-1 EYE” in collaboration with Sony Group Corporation and JAXA launched on January 3rd, 2023, whose main mission is to let users operate the satellite to take their original photos or videos. The other is “ONGLAISAT” collaborating with ArkEdge Space Inc. and TASA, whose main mission is to perform the Earth remote sensing, which was released from the International Space Station (ISS) on December 9th, 2024. Those two satellites use S-band for telemetry and command communication, and X-band for mission data downlink at high speed. Additionally, they have an LPWA transceiver to perform a Store & Forward (S&F) mission. While each of these transmitters and receivers has its unique role, they have the potential to work as a redundant system to supplement a specific functionality. In this paper, we explain the installed communication modules, discuss the application of the redundant system for 6U CubeSat, and show the results of the on-orbit demonstration.
