Evaluation of Schemes to Measure Satellite Range Errors by GIC Ground Monitoring Segment

Young C. Lee

Abstract: For GPS to be used for nonprecision approach guidance, it is essential to monitor the GPS signals-in-space status for integrity with a fast response time. One alternative to provide such a monitoring function is to develop and deploy the GPS Integrity Channel (GIC), an independent monitoring system that employs ground-based signal monitors and a satellite-based integrity broadcast channel. The GIC ground monitoring segment would consist of a few ground monitoring stations (GMS) covering a large region and two integrity processing stations (IPS), each collocated with one of the GMS. This paper analyzes issues involved in the design and implementation of the ground monitoring segment. In particular, it presents and compares two alternative ground monitoring schemes: one scheme uses classified GPS information, and the other does not. For each scheme, processing functions needed at the GMS and the IPS are identified considering the impact of Selective Availability on monitoring and the integrity decision concept recommended by the GIC Working Group of RTCA-159. This analysis will be used to support the development of the functional requirements of the OMS and IPS for the FAA's GIC.
Published in: Proceedings of the 1989 National Technical Meeting of The Institute of Navigation
January 23 - 26, 1989
San Mateo, CA
Pages: 47 - 51
Cite this article: Lee, Young C., "Evaluation of Schemes to Measure Satellite Range Errors by GIC Ground Monitoring Segment," Proceedings of the 1989 National Technical Meeting of The Institute of Navigation, San Mateo, CA, January 1989, pp. 47-51.
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