Mitigating Short-Delay Multipath: a Promising New Technique

Jean Marie Sleewaegen and Frank Boon

Abstract:	In the recent years, several advanced signal processing techniques have been devised to mitigate errors induced by multipath signals. They have proved very efficient against multipath having a medium or large delay with respect to the direct signal. Typically, the errors are largely removed for multipath delays higher than around 20 m. From a theoretical point of view, this constitutes a dramatic improvement with respect to simpler techniques such as the narrow correlator. However, when analysing field data, the resulting performance is often disappointing: the improvement over the narrow-correlator is marginal. The reason is that most of the multipath signals enter the receiver with a short delay with respect to the direct signal, rendering the mitigation scheme ineffective. This paper presents a new signal processing algorithm for multipath mitigation, based on the a-posteriori estimation of the tracking errors. This method is shown to achieve up to 50% better immunity to short-delay multipath compared to other state-of-the-art techniques. The performance is evaluated both from a theoretical analysis and from real data. A comparison with state-of-the-art technologies demonstrates an improved mitigation capability in most practical situations.
Published in:	Proceedings of the 14th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 2001) September 11 - 14, 2001 Salt Palace Convention Center Salt Lake City, UT
Pages:	204 - 213
Cite this article:	Sleewaegen, Jean Marie, Boon, Frank, "Mitigating Short-Delay Multipath: a Promising New Technique," Proceedings of the 14th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 2001), Salt Lake City, UT, September 2001, pp. 204-213.
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