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Statistical modeling for the mitigation of GPS multipath delays from day-to-day range measurements

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Abstract

Based on a least-squares model for double-difference GPS pseudoranges and carrier-phases, measurement residuals expressed in time series during an observation session are positively correlated between one sidereal day and the preceding days. As a result of the satellite’s period, the phenomenon, which takes place at a user receiving site, is attributed to multipath interference. Examples from a weekly measurement dataset of control baselines are shown, where the known end-point coordinates also serve as a benchmark for assessing positioning accuracy. The system of error equations for mixed-model adjustment is divided into two subsystems. One set of the error equations is related to the real range measurements, while the other involves the pseudo-observation with an empirical sample variance. According to the existing correlation between day-to-day residual estimates, a multipath-mitigating algorithm is proven to improve the accuracy of the GPS height determination by at least 40%. It is also found that the algorithm depends on a variance-component estimator that adaptively scales an error covariance matrix for both the real range and empirical delay measurements.

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Authors and Affiliations

  1. Center for Space and Remote Sensing Research, National Central University, Jhongli, 320, Taiwan

    Joz Wu & Chi-Hsiu Hsieh

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  1. Joz Wu
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  2. Chi-Hsiu Hsieh
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Correspondence to Joz Wu.

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Wu, J., Hsieh, CH. Statistical modeling for the mitigation of GPS multipath delays from day-to-day range measurements. J Geod 84, 223–232 (2010). https://doi.org/10.1007/s00190-009-0358-6

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