A Japanese first spaceborne GPS receiver, within the Orbital Reentry Experiment (OREX) vehicle, was lanuched by the H-II launch vehicle on February 4, 1994. The observed GPS data are analyzed in this report to evaluate the accuracy of orbit determination by GPS. We examined four techniques for orbit determination; GPS stand-alone navigation, differential GPS navigation, GPS navigation with the precise ephemeris, and GPS/IMU hybrid navigation. These results were evaluated by comparison with independent radar data and the efficiency of GPS orbit determination is confirmed.


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