Abstract

The Space flyer unit (SFU) is an unmanned, retrievable and reusable multipurpose space platform. It was launched by the Japanese H-II launch vehicle in March 1995 and was retrieved by the United State's Space Shuttle STS-72. We tried realtime orbit determination for the SFU using Global Positioning System.(GPS), and the experiment was very successful. In addition to the free-flight, we were able to evaluate continuous real-time OD solution during orbital maneuvers and attitude control. The real-time orbit solutions from the experimental GPS receiver onboard the SFU are evaluated in view of their accuracy and reliability for use in SFU orbit determination.

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