2015 年 14 巻 ists30 号 p. Pf_131-Pf_140
Between June 2011 and March 2014, The University of Tokyo, in collaboration with The Next Generation Space system Technology Research Association, developed a twin micro-satellite: Hodoyoshi-3 and -4 to demonstrate and establish an innovative system design and a cost-effective development process for the mass production of micro-satellites in the future based on a new concept called “Hodoyoshi”, which means “reasonably reliable”. On June 19, 2014, the two satellites were successfully launched into Sun Synchronous Orbit, at an altitude of approximately 630 km. To date, we met several objectives with regard to system performance on-orbit, a considerable amount of mission data including Earth observation images. This project demonstrates system architecture design methods, integration and test processes, and on-orbit operation methods such as recovery functions from anomalies. The project is currently undergoing evaluation, under which the results of the operation are being reviewed with regard to the Hodoyoshi concept. This paper explains the Hodoyoshi concept, providing examples of hardware and software design, and arriving at a reasonable interface design and coordination. The paper also introduces the major characteristics of the satellites, and explains the key features and approaches of microsatellite development to realize cost-effectiveness.
