In-Orbit Experiment of GPS Navigation by Japanese Orbital Reentry Experiment (OREX)

Isao Kawano, Tatsushi Izumi, Takuya Fujiwara

Abstract:	The present paper intends to present an overview of the requirement and concepts for the in-orbit experiment of spaceborne GPS receiver and GPS navigation system by Japanese Orbital Reentry Experiment (OREX), which is planned in 1993. NASDA have studied the application of GPS navigation system for H-II Orbiting PlanE (HOPE), which is a Japanese space transportation vehicle launched by a H-II rocket. The first flight of the HOPE will be in the end of 1990s. It is thought that the GPS navigation is a key component to guide the HOPE safely during on-orbit, rendezvous, reentry, approach and landing phases. So that the in-orbit verification is essential in addition with the ground test. Study effort on the in-orbit experiment by OREX has been performed. The OREX will be launched in 1993 by the H-II rocket first flight. The performances of GPS receiver (GPSR) and GPS navigation in on-orbit and reentry (including black-out) phases will be evaluated by the experiment. This paper presents the technical items which should be evaluated, the flight sequence, the telemetry data and the concept of evaluation. We started developing the engineering model for the OREX experiment. The design and the production is under going, and now the ground test of the receiver Is under preparation. In the rest part, the result of the design and the produCtion of the engineering model will be shown.
Published in:	Proceedings of the 4th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1991) September 11 - 13, 1991 Albuquerque, NM
Pages:	981 - 990
Cite this article:	Kawano, Isao, Izumi, Tatsushi, Fujiwara, Takuya, "In-Orbit Experiment of GPS Navigation by Japanese Orbital Reentry Experiment (OREX)," Proceedings of the 4th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1991), Albuquerque, NM, September 1991, pp. 981-990.
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