Channel Estimation Technique for Positioning Accuracy Improvement in Multipath Propagation Scenarios

Andreas Schmid and Andre Neubauer

Abstract:	Multipath propagation of navigation signals frequently leads to positioning errors of navigation receivers. This papers presents a channel estimation technique that can substantially improve the positioning accuracy in multipath propagation scenarios. Statistical signal processing techniques are applied to derive an implementation-efficient algorithm, which estimates the ratio of line-of-sight to multipath signal power. This ratio forms a reliability metric that is determined for each individual navigation signal. Additionally to the code phase or pseudo-range measurements, the receiver then also delivers these reliability metrics to the navigation processor. The accuracy of the position solution can then be optimized by weighting the individual code phase measurements according to the reliability metrics. This is possible because there are frequently more navigation signals available than minimally required, where the future deployment of Galileo satellites adds further improvement. The result is enhanced positioning accuracy. Furthermore, the navigation processor can also estimate the expected accuracy of each position fix.
Published in:	Proceedings of the 17th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2004) September 21 - 24, 2004 Long Beach Convention Center Long Beach, CA
Pages:	1195 - 1202
Cite this article:	Schmid, Andreas, Neubauer, Andre, "Channel Estimation Technique for Positioning Accuracy Improvement in Multipath Propagation Scenarios," Proceedings of the 17th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2004), Long Beach, CA, September 2004, pp. 1195-1202.
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