An Integrated GPS/GLONASS Receiver

Harumasa Hojo, Shigeo Kawashima, Mikio Nakamura, Katsuo Yui, Akira Okuyama, Koichi Washizu, and Kohji Ogawa

Abstract:	Utilization of a safe and economical satellite navigation system for civil aviation becomes more important, as a current experimental stage will be transferred to a fully operational stage soon. The ICAO’s special committee of Future Air Navigation systems (FANS) had many technical investigations and examined technical issues on GNSS(Globa1 Navigation Satellite Systems). The committee reached the conclusion that one of the most useful solutions of the issues is an integrated use of USA’s GPS and Russian GLONASS for civil aviation navigation to meet the integrity requirement. In Japan also, examinations of the integrated use of GPS and GLONASS have been started since 1991 mainly by Japan Civil Aviation Bureau( JCAB). Japan Civil Aviation Promotion Foundation(JCAPF) entrusted Japan Radio Co., Ltd. (JR0 with a trial manufacture of an experimental receiver in 1992. Several flight tests for purposes of evaluation are scheduled this year jointly by JRC and Electronic Navigation Research Institute(ENR1). This paper describes an outline of architecture, composition and technical problems with evaluation results of the GPS/GLONASS integrated receiver we made. The receiver is able to receive up to 16 satellite signals with 8 GPS channels and 8 GLONASS channels respectively. Position fix is done in all-in-view mode. Time offsets between user clock and the two systems clocks as well as user position are solved from more than 5 navigation equations when two kinds of satellites are received. The receiver has an online calibration function of separated analog I. F. channels to compensate differences among channel group delays and improve accuracy of position fixes. The RAIM functions specified in MOPS[ll are satisfied. The receiver is still in an experimental stage, but is conformed to ARINC project paper 743.121
Published in:	Proceedings of the 6th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1993) September 22 - 24, 1993 Salt Palace Convention Center Salt Lake City, UT
Pages:	979 - 984
Cite this article:	Updated citation: Published in NAVIGATION: Journal of the Institute of Navigation
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