Independent Control Segment URA Monitor Incorporating Crosslink Ranging Measurements for Meeting LPV200 Integrity Requirements

Brian Bian, Daniel O'Laughlin, Curtis A. Shively, Ronald Braff

Abstract:	A ground-only independent user range accuracy (URA) monitor (IUM) has previously been proposed as a means for performing an independent check of a satellite’s URA integrity. The IUM does this by processing satellite pseudoranges collected at ground monitor stations. That approach was shown to have limitations, especially for service in the Southern Hemisphere. This paper proposes a modified concept whereby satellite crosslink (XL) ranging measurements are used in addition to the ground-based pseudorange measurements. The IUM extended for this purpose is referred to herein as the XL-aided IUM. A method for analyzing the performance of the XL-aided IUM is given. The performance of the XL-aided IUM is then compared with that from the ground-only IUM. The study shows that the XL-aided IUM yields smaller integrity-assured URA values and improves availability of LPV200, an approach operation with vertical guidance down to 200 ft above threshold. The daily average LPV200 availability is shown to be above 99% worldwide except at the North and South Poles.
Published in:	Proceedings of the 24th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2011) September 20 - 23, 2011 Oregon Convention Center, Portland, Oregon Portland, OR
Pages:	2696 - 2712
Cite this article:	Bian, Brian, O'Laughlin, Daniel, Shively, Curtis A., Braff, Ronald, "Independent Control Segment URA Monitor Incorporating Crosslink Ranging Measurements for Meeting LPV200 Integrity Requirements," Proceedings of the 24th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2011), Portland, OR, September 2011, pp. 2696-2712.
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