Phase Compensation in GPS Array Processing using a Software Radio

Sai K. Kalyanaraman and Michael S. Braasch

Abstract:	Digital Beam Forming (DBF) and nulling are viable means of GPS array signal processing that enable multipath mitigation and provide protection against interference. However, as reported in the literature, nulling causes errors in the carrier phase and code phase measurements. Unlike single element GPS antennas (Fixed reception pattern antennas – FRPA’s), multi element antenna arrays (Controlled Reception Pattern Antennas – CRPA’s) exhibit significant distortions in their phase patterns. Correction for known anomalies in the individual element patterns mitigates the carrier phase error. Part of the carrier phase error arising from the application of non-trivial complex weights, implemented as part of the nulling action, can be compensated for in the carrier phase tracking and measurement domain in the baseband GPS receiver processing. Such an approach enabled by the use of a SW defined GPS radio will be demonstrated in the paper with results to support the theory.
Published in:	Proceedings of IEEE/ION PLANS 2006 April 25 - 27, 2006 Loews Coronado Resort Hotel San Diego, CA
Pages:	324 - 334
Cite this article:	Kalyanaraman, Sai K., Braasch, Michael S., "Phase Compensation in GPS Array Processing using a Software Radio," Proceedings of IEEE/ION PLANS 2006, San Diego, CA, April 2006, pp. 324-334. https://doi.org/10.1109/PLANS.2006.1650619
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