Japanese Experimental GPS Augmentation using Quasi-Zenith Satellite System (QZSS)

Isao Kawano, Masaaki Mokuno, Satoshi Kogure and Motohisa Kishimoto

Abstract:	A lot of applications like car navigation using Global Positioning System (GPS) have been greatly increased for several years in the world, especially in Japan. They are essential for our life now. However, global navigation satellite system (GNSS) like GPS cannot fully satisfy with its user requirements in such places surrounded buildings or mountains where we hardly see enough number of satellites. Japanese geographic feature sometimes causes the interruption of positioning and the degradation of the positioning accuracy due to bad Geometric Dilution of Precision (GDOP). From such background, it is expected that the augmentation of GPS by Quasi-Zenith Satellite System (QZSS) will improve the performance of GPS in such areas. QZSS is the constellation consisted of several satellites orbiting inclined orbital planes with GEO-synchronous period. Each satellite is allocated on the different orbits so as to pass over same ground track in constant intervals. Eccentricity and inclination are selected so that minimum elevation angle is larger than about 70 degrees through 24 hours in service areas. This paper introduces our QZSS objectives, program and the architecture of High Accuracy Positioning Experiment System (HIAPEX) using QZSS. Then, the contents of our experimental plan will be explained. HIAPEX demonstrates, 1. GPS Complement and Augmentation, 2. Development of future satellite positioning technology. We are now in the conceptual design phase. We will explain our latest status.
Published in:	Proceedings of the 17th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2004) September 21 - 24, 2004 Long Beach Convention Center Long Beach, CA
Pages:	175 - 181
Cite this article:	Kawano, Isao, Mokuno, Masaaki, Kogure, Satoshi, Kishimoto, Motohisa, "Japanese Experimental GPS Augmentation using Quasi-Zenith Satellite System (QZSS)," Proceedings of the 17th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2004), Long Beach, CA, September 2004, pp. 175-181.
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