A Study on High Accuracy Positioning System Enhanced by Quasi-Zenith Satellites

Toshio Furukawa, Masayuki Saito, and Akira Akaishi

Abstract:	Nowadays in Japan, the development and realization of the regional positioning system using quasi-zenith satellites has been extensively studied for the purpose of complement and augmentation of GPS. The geometrical allocation of satellites will be improved for location determination when we make use of GPS satellites together with quasi-zenith satellites, which are quite effective for Japanese urban canyon. Also, if quasi-zenith satellites broadcast and distribute positioning correction data, we shall be able to receive excellent location services anytime and anywhere. We discuss here some basic ideas for high accuracy positioning technology, that is, the positioning methodology, the combination of received signals, and the quick resolution of ambiguity. As positioning methodology, we shall select the network-based positioning method and the wide area positioning method, both of which will be efficient for precise positioning of mobile users. Next, we refer to the combination of received signals, which will turn out to be very useful for both the calculation of correction data and the determination of locations. Furthermore, we propose two of new methods for quick resolution of ambiguity, that is, “Integer Verification Method” and “Integer Difference Method”, named here. Finally, as high accuracy positioning correction data services for mobile users enhanced by quasi-zenith satellites, we present the network-based DGPS of sub-meter class for single frequency receivers, the wide area DGPS of decimeter class for dual or triple frequency receivers, and the network-based RTK for centimeter class for dual or triple frequency receivers.
Published in:	Proceedings of the 2004 National Technical Meeting of The Institute of Navigation January 26 - 28, 2004 The Catamaran Resort Hotel San Diego, CA
Pages:	157 - 166
Cite this article:	Furukawa, Toshio, Saito, Masayuki, Akaishi, Akira, "A Study on High Accuracy Positioning System Enhanced by Quasi-Zenith Satellites," Proceedings of the 2004 National Technical Meeting of The Institute of Navigation, San Diego, CA, January 2004, pp. 157-166.
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