Communication Satellite Augmented GPS Payload Architecture

M. Aparicio, P. Brodie, J. Rajan, R. Sung

Abstract:	CAG is an augmentation to the Global Positioning System (GPS), designed to meet critical military and civil requirements of Availability, Integrity and Accuracy that GPS in its present configuration, cannot completely satisfy. One effective means of augmentation is through the use of geostationary satellites. While this is not a new idea, having been previously presented in the literature by The Aerospace Corp., Inmarsat, and others, ITT has been investigating specific system architectures to remove potential system and payload implementation problems such as, phase noise and stringent frequency reference requirements. Under studies sponsored by the U.S. Air Force Space and Missile Command* and under ITT internal funds, I’lT has developed a unique solution to the GPS augmentation problem. Although designed for use with the Defense Satellite Communication System (DSCS) satellite, ITT’s payload design is general enough to be used with other satellites as well. While it is recognized that using a communications satellite for GPS augmentation is an effective means of enhancing navigation performance at a fraction of the cost of launching a dedicated satellite, the utilization of existing spacecraft is not without problems. While not necessarily specific to the use of DSCS, use of existing assets usually impose significant constraints on any new payloads. CAG is no exception. ITT has addressed these challenges by creating an optimal form of the CAG system architecture. A description of this architecture along with design tradeoffs, is presented in this paper.
Published in:	Proceedings of the 7th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1994) September 20 - 23, 1994 Salt Palace Convention Center Salt Lake City, UT
Pages:	1007 - 1016
Cite this article:	Aparicio, M., Brodie, P., Rajan, J., Sung, R., "Communication Satellite Augmented GPS Payload Architecture," Proceedings of the 7th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1994), Salt Lake City, UT, September 1994, pp. 1007-1016.
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