Isolating multi-path effects from the position estimate residuals in GPS receivers

Multi-path reflections can cause GPS receiver devices to mis-calculate their location. Errors due to multi-path will tend to bias the position estimate from the true value. The redundancy of satellites can be utilized to identify a single source of error. The estimated residual error is an artifact...

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Bibliographic Details
Published inMILCOM 2008 - 2008 IEEE Military Communications Conference pp. 1 - 6
Main Authors MacDonald, J.T., Ucci, D.R., LoCicero, J.L.
Format Conference Proceeding
LanguageEnglish
Published IEEE 01.11.2008
Subjects
Computational modeling
Global Positioning System
Interference
Isolation technology
Least squares approximation
Modulation coding
Protocols
Redundancy
Reflection
Satellites
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Summary:Multi-path reflections can cause GPS receiver devices to mis-calculate their location. Errors due to multi-path will tend to bias the position estimate from the true value. The redundancy of satellites can be utilized to identify a single source of error. The estimated residual error is an artifact of the least squares estimate process. After the estimate is computed, the residual estimate error from each satellite should be uniform. If it is not, the satellite signal associated with the largest errors may have come to the receiver along a reflected path. Once identified, the corrupted pseudo-range can be removed from the estimator. The detection technique is described. A simulation study is undertaken to determine the best detection threshold for typical use scenarios.
ISBN:9781424426768
1424426766
ISSN:2155-7578
2155-7586
DOI:10.1109/MILCOM.2008.4753499