Strobe & Edge Correlator Multipath Mitigation for Code

Lionel Garin, Frank van Diggelen, 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 Diiferential GPS, multipath is usually the single largest source of error. Ashtech has developed three new correlator schemes which are now implemented in new receivers to satisfy the multipath mitigation objectives for all applications. Edge CorrelatorTM is an enhancement of AshtechB’s proven Super CIA technique for reducing multipath on code. Strobe CorrelatorTM is a totally new and revolutionary idea that uses a very simple hardware structure and onty one extra correlator for a better code tracking. Enhanced Strobe CorrelationTM also uses a very simple hardware structure and three extra correlators, and provides multipath mitigation for both code and carrier. The Strobe Correlation techniques (patent pending) provide the best muhipath mitigation available. Strobe Correlation consumes less than 1 watt of power, totally removes the effect of far multipath and substantially reduces the effect of near multipath. The paper focuses on Edge and Strobe Correlator techniques comparing them to the One-Chip Wide and Narrow Correlator technologies in a multipath mitigation perspective. Results will be shown for simulations and real-life applications.
Published in:	Proceedings of the 9th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1996) September 17 - 20, 1996 Kansas City, MO
Pages:	657 - 664
Cite this article:	Garin, Lionel, van Diggelen, Frank, Rousseau, Jean-Michel, "Strobe & Edge Correlator Multipath Mitigation for Code," Proceedings of the 9th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1996), Kansas City, MO, September 1996, pp. 657-664.
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