Multiple Antennas for Advanced GNSS Multipath Mitigation and Multipath Direction Finding

Dignus-Jan Moelker

Abstract:	This paper proposes and studies new integrated multipath direction finding and multipath mitigation techniques for GNSS. These techniques are based on the hybrid combination of multiple antennas and multiple correlators per receiver channel. Additional antennas enable identification of multipath directions and mitigation of residual multipath and noise, which remain present after application of single antenna techniques. Two new GNSS multipath direction finding algorithms are proposed. The first is an extension of the Multipath Estimating Delay Lock Loop (MEDLL) and the second uses Multiple Signal Classification (MUSIC). The feasibility of both techniques is demonstrated by measurements, which indicate an achievable direction estimation error of 4.9 degrees for the MEDLL-extension and 1.5 degrees for MUSIC. Two advanced multipath mitigation techniques using multiple antennas are discussed. The first applies averaging of code and carrier phase measurements and the second uses electronic nulling. Both techniques are evaluated with measurements, and shown to be effective. If combined with correlator-based multipath mitigation, both techniques give results close to the theoretical multipath and noise reduction limits. All measurements are done with two antennas and two NovAtel prototype MEDLL receivers.
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:	541 - 550
Cite this article:	Moelker, Dignus-Jan, "Multiple Antennas for Advanced GNSS Multipath Mitigation and Multipath Direction Finding," 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. 541-550.
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