Use of Uncorrected GPS Carrier Phase Measurements for Incremental RAIM with WAAS

Duncan B. Cox Jr. and William R. Michalson

Abstract:	A Wide Area Augmentation System (WAAS) is being developed in the U.S. to augment the GPS system for navigation of civilian aircraft. The WAAS will provide integrity warning flags and corrections for GPS pseudorange data . There will be delays in receipt of the WAAS data, perhaps by as much as 7 seconds. Sign&ant errors in the pseudorange or phase measurements can occur suddenly, during the 7-second latency interval, due to GPS satellite errors. It is advisable for the aircrafl navigator to implement a Receiver Autonomous Integrity Monitoring (RAIM) procedure to detect such an error well in advance of receipt of the WAAS integrity flag. This paper shows how uncorrected GPS phase measurements can be used effectively in an incremental&AIM procedure, extending the integrity protection into the latency interval.
Published in:	Proceedings of the 51st Annual Meeting of The Institute of Navigation (1995) June 5 - 7, 1995 Antlers Doubletree Hotel Colorado Springs, CO
Pages:	515 - 520
Cite this article:	Cox, Duncan B., Jr., Michalson, William R., "Use of Uncorrected GPS Carrier Phase Measurements for Incremental RAIM with WAAS," Proceedings of the 51st Annual Meeting of The Institute of Navigation (1995), Colorado Springs, CO, June 1995, pp. 515-520.
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