Predicted Performance of Ground Monitoring for Satellite Correlation Peak Faults in LAAS

Curtis A. Shively

Abstract:	Research is underway to develop tests for the Local Area Augmentation System (LAAS) Ground Facility (LGF) to detect satellite signal faults (known as “evil waveforms”) that cause distortions of the correlation function being tracked. This paper derives the minimum detectable range error (MDE) for one such test that compares pseudorange measurements at the reference correlator spacing used for the broadcast corrections to pseudorange measurements at other correlator spacings. The derivation considers performance requirements for probability of fault-free detection and probability of missed detection of a fault. Multipath from a previous modeling effort by other researchers is included as the main source of corruption in the decision statistic that affects test performance. The resulting values of MDE are compared to a previously derived maximum tolerable range error from one satellite (MERPROS) protected by a position domain bound computed in the aircraft. For the spacings tested that do not provide adequate margin between MDE and MERPROS, a method is suggested for computing the aircraft bound using inflated parameters to give adequate limiting of satellite geometry. The results of this analysis have been used to validate requirements in the LGF specification for detecting evil waveforms.
Published in:	Proceedings of the 2000 National Technical Meeting of The Institute of Navigation January 26 - 28, 2000 Pacific Hotel Disneyland Anaheim, CA
Pages:	226 - 235
Cite this article:	Shively, Curtis A., "Predicted Performance of Ground Monitoring for Satellite Correlation Peak Faults in LAAS," Proceedings of the 2000 National Technical Meeting of The Institute of Navigation, Anaheim, CA, January 2000, pp. 226-235.
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