Enhanced Strobe Correlator Multipath Rejection for Code & Carrier

Lionel Garin, Jean-Michel Rousseau

Abstract:	GPS multipath effects occur when reflected satellite signals (from surfaces around or under the antenna) interfere with the direct satellite signal. Multipath causes receivers to make inaccurate measurements, or even lose lock on the signal. Multipath conditions are always present. For high precision GPS positioning, multipath is still the single largest source of error. There are several existing methods for reducing the effects of multipath: among them the Edge Correlator TM and the better Strobe Correlator TM provide multipath rejection for code only. An even more advanced technique of Enhanced Strobe Correlation TM is discussed here. This technique notably provides C/A carrier phase multipath rejection and even better C/A code rejection (particularly in the near multipath). Since the method uses extra correlators built into the ASIC, the firmware and hardware overhead is minimal. The tradeoffs (greater complexity, significant convergence time, potential noise observable degradation) usually attached to other multipath rejection techniques, are minimized. Theoretical simulations and real-life results are presented in this paper. We will show how the RTK techniques can be greatly improved by this method. We will also demonstrate that this method does not exhibit the performance degradation which has been mentioned for earlier mitigation schemes.
Published in:	Proceedings of the 10th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1997) September 16 - 19, 1997 Kansas City, MO
Pages:	559 - 568
Cite this article:	Garin, Lionel, Rousseau, Jean-Michel, "Enhanced Strobe Correlator Multipath Rejection for Code & Carrier," Proceedings of the 10th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1997), Kansas City, MO, September 1997, pp. 559-568.
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