Title: Correlator Beamforming for Multipath Mitigation at Relatively Low Cost: Initial Performance Results
Author(s): Sanjeev Gunawardena, John Raquet, Mark Carroll
Published in: Proceedings of the 29th International Technical Meeting of The Satellite Division of the Institute of Navigation (ION GNSS+ 2016)
September 12 - 16, 2016
Oregon Convention Center
Portland, Oregon
Pages: 353 - 363
Cite this article: Gunawardena, Sanjeev, Raquet, John, Carroll, Mark, "Correlator Beamforming for Multipath Mitigation at Relatively Low Cost: Initial Performance Results," Proceedings of the 29th International Technical Meeting of The Satellite Division of the Institute of Navigation (ION GNSS+ 2016), Portland, Oregon, September 2016, pp. 353-363.
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Abstract: Multipath is the single largest naturally occurring un-modelled error source that affects high-accuracy and differential GNSS applications. Even though decades of research and development on advanced multipath mitigating antennas and correlator gating techniques have contributed significantly to reducing this error source, short delay, higher-elevation and carrier multipath continues to be a problem. It is well known that antenna array-based beamforming is particularly effective against these types of multipath. However, traditional beamforming technology is too large, heavy, power hungry and costly for all but a few specific applications. Locata Corporation’s Correlator Beamforming technology employs RF signal switching and a single front-end to significantly reduce complexity, power consumption and cost. The technology has been shown to be effective at mitigating multipath in non-GNSS terrestrial and challenging indoor applications. This paper investigates the feasibility of applying Correlator Beamforming to GNSS. The results reported in this paper shows that a Correlator Beamforming GPS receiver is nearly as effective as a full beamsteering receiver at rejecting multipath.