QZSS System Design and its Performance

Motohisa Kishimoto, Hidemi Hase, Akihiro Matsumoto, Takashi Tsuruta, Satoshi Kogure, Noriyasu Inaba, Mikio Sawabe, Toneo Kawanishi, Susumu Yoshitomi, and Koji Terada

Abstract:	QZSS (Quasi-Zenith Satellite System) is a Japanese satellite navigation system that consists of space segment, ground segment and user segment. In space segment, there are three QZS (Quasi-Zenith Navigation Satellite) whose orbit is designed that one QZS out of three satellites always exists near zenith over Japan at least. QZSS also has slightly elliptical and highly inclined orbits in different orbital planes. The eccentricity is less than 0.099 and inclination is about 45 which optimized for the middle latitude area like Japan. The benefit of QZSS is that QZSS can provide a seamless service from a high elevation angle to improve the positioning availability in downtown and mountainous areas. Users in Japan, therefore, can observe one QZS at more than 60 degrees elevation angle, and especially, users in main island of Japan can receive a QZS signal from more than 70 degrees. QZSS signals from high elevation angle can provide substantially better positioning availability than that of GPS alone. The constellation of QZSS can improve the user positioning availability effectively with fewer satellites. In this paper, we introduce our QZSS system design and its performance including the QZSS signals.
Published in:	Proceedings of the 2007 National Technical Meeting of The Institute of Navigation January 22 - 24, 2007 The Catamaran Resort Hotel San Diego, CA
Pages:	405 - 410
Cite this article:	Kishimoto, Motohisa, Hase, Hidemi, Matsumoto, Akihiro, Tsuruta, Takashi, Kogure, Satoshi, Inaba, Noriyasu, Sawabe, Mikio, Kawanishi, Toneo, Yoshitomi, Susumu, Terada, Koji, "QZSS System Design and its Performance," Proceedings of the 2007 National Technical Meeting of The Institute of Navigation, San Diego, CA, January 2007, pp. 405-410.
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