Evaluation, Refinement and Fusion of Software-Based Pseudorange Multipath Mitigation Techniques

R. Benjamin Harris

Abstract:	Multipath remains a significant error source to the GPS user even when employing a receiver and antenna designed for multipath rejection. This study evaluated data processing methods to further remove pseudorange multipath from observations collected by a GPS reference station using multipath-resistant hardware. Both template- and surface-based empirical models were implemented as batch processes. Both analytic and algorithmic enhancements to the processes are presented. Previous studies have evaluated the effectiveness of multipath mitigation algorithms by looking at higher order statistics of the multipath in the observations after filtering. In contrast, this effort evaluated the effectiveness of multipath removal techniques by forming position estimates with the filtered observations. The quality of the position estimate is summarized using two metrics, the volume of the 3ó error ellipsoid and RMS of range residuals. After investigating several error models and processing techniques for pseudorange multipath and related errors, the most effective models were applied to a control set of observations. The application resulted in consistent improvement in positioning results. The RMS of range residuals improved by an average of 18%, and the volume of the 3ó error ellipsoid reduced by 60%.
Published in:	Proceedings of the 15th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 2002) September 24 - 27, 2002 Oregon Convention Center Portland, OR
Pages:	460 - 471
Cite this article:	Harris, R. Benjamin, "Evaluation, Refinement and Fusion of Software-Based Pseudorange Multipath Mitigation Techniques," Proceedings of the 15th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 2002), Portland, OR, September 2002, pp. 460-471.
Full Paper:	ION Members/Non-Members: 1 Download Credit Sign In