DEVELOPMENT OF GAUSSIAN OVERBOUNDS FOR THE LAAS SIGNAL-IN-SPACE INTEGRITY MONITORING ALGORITHMS

Fan Liu

Peer Reviewed

Abstract: This paper discusses the calculation of the Local Area Augmentation System LAAS signal-in-space SIS integrity monitoring algorithms and their integration with the ground fault detection and exclusion function. To complete the LAAS architecture, the performance of the LAAS SIS integrity monitoring system with the selected vertical - lateral protection level VPL - LPL algorithms must be guaranteed. A previous paper described the LAAS SIS integrity monitoring and the plan for verifying the algorithms. Early results were presented, showing that the ground fault detection and exclusion methodology affects the statistical characteristics of the resulting averaged pseudorange corrections. The analysis for the fault-free system was presented. This paper provides the theoretical results for the faulted system. The Gaussian probability density functions (pdf) that bound the actual pdf’s of the composite pseudorange correction errors are developed based on the analysis of both the fault-free and faulted system. It is shown that the underlying assumptions used in the selected integrity monitoring algorithms need to be adjusted if the ground processing function detects a fault. Hence, the VPL - LPL algorithms should be modified to meet the performance requirements. The VPL calculation is demonstrated through an example. Finally, possible improvements to the present algorithms are discussed.
Published in: NAVIGATION, Journal of the Institute of Navigation, Volume 46, Number 1
Pages: 49 - 64
Cite this article: Liu, Fan, "DEVELOPMENT OF GAUSSIAN OVERBOUNDS FOR THE LAAS SIGNAL-IN-SPACE INTEGRITY MONITORING ALGORITHMS", NAVIGATION, Journal of The Institute of Navigation, Vol. 46, No. 1, Spring 1999, pp. 49-64.
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