Evaluation & Reduction
of Multipath-Induced Bias on GPS Time-of-Arrival
2003 Award Winner
Ronald L. Fante, The MITRE Corporation
John J. Vaccaro, The MITRE Corporation
ABSTRACT
This paper presents new expressions for the multipath-induced pseudorange
error(i.e. bias) and variance introduced by multipath onto the time
of arrival estimate obtained using a non-coherent early-late gate discriminator.
The results include the effect of front-end bandwidth and early-late
gate spacing. We also investigate a blind method for cancelling the
multipath, in order to improve the time-of-arrival estimate. Our approach
uses early-late gate processing on an objective function derived from
an adaptive FIR filter that attempts to match the crosscorrelation of
the received signal with a multipath-free replica of the desired crosscorrelation.
This method performs reasonably well, and decreases the multipath-induced
pseudorange error by approximately a factor of 2, even in very stressing
multipath environments.
Publication
Copyright © 2004 IEEE. Reprinted from IEEE Vol. 39, No.
3, pp.911-920. July 2003. This material is posted here with permission
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