The Hybrid Architecture for Attitude Determination

John Cooper, Gary Brodin and Peter Daly

Abstract:	The Institute of Satellite Navigation at the University of Leeds has over the past five years been involved in the design and development of a high precision, dual-frequency, GPS/GLONASS receiver for use by the Euro-pean Space Agency (ESA) in spaceborne systems. The digital hardware and its interface is highly flexible mak-ing the component useful for a wide range of applica-tions, ranging from basic platform positioning to Earth observation using radio occultation techniques. In addition to these uses, the Advanced GPS GLONASS ASIC (AGGA) supports attitude determination with ei-ther GPS or GLONASS and includes a patented Hybrid processing architecture based on a master-slave antenna and channel arrangement. The ISN, in conjunction with Matra Marconi Space (Toulouse, France), is producing a single-frequency GPS/GLONASS receiver based upon the first generation ASIC designed to be used for all as-pects of spacecraft control, including platform attitude determination. The paper describes the architecture of the receiver and ASIC and describes in detail the features which support attitude determination. Both traditional channel ar-rangements— parallel and multiplexed—are achieved with the AGGA and their relative merits are discussed. The novel Hybrid scheme, also included in the AGGA, is then introduced and shown to have significant perform-ance advantages over both traditional methods.
Published in:	Proceedings of the 12th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1999) September 14 - 17, 1999 Nashville, TN
Pages:	1969 - 1978
Cite this article:	Cooper, John, Brodin, Gary, Daly, Peter, "The Hybrid Architecture for Attitude Determination," Proceedings of the 12th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1999), Nashville, TN, September 1999, pp. 1969-1978.
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