Prediction of Antenna and Antenna Electronics Induced Biases in GNSS Receivers

Inder Gupta, Christopher Church, Andrew O’Brien, and Chad Slick

Abstract:	An approach to predict the antenna and antenna electronics induced code phase and carrier phase biases in GNSS receivers is described. The approach is equally applicable to fixed pattern antennas as well as adaptive antennas. In the approach, the in situ volumetric patterns of individual antenna elements are used. Since these patterns do not vary with the incident signal scenario, the patterns can be measured / analyzed in advance and can be stored for the prediction of antenna induced biases. We demonstrate the accuracy of the proposed approach by comparing the predicted biases with the results obtained using computer simulations. A GAS-1 antenna with 7-tap STAP based AE is used in the study. It is shown that the predicted antenna induced biases match very well with the true biases. This is true in the presence of multiple interfering signals.
Published in:	Proceedings of the 2007 National Technical Meeting of The Institute of Navigation January 22 - 24, 2007 The Catamaran Resort Hotel San Diego, CA
Pages:	650 - 656
Cite this article:	Gupta, Inder, Church, Christopher, O’Brien, Andrew, Slick, Chad, "Prediction of Antenna and Antenna Electronics Induced Biases in GNSS Receivers," Proceedings of the 2007 National Technical Meeting of The Institute of Navigation, San Diego, CA, January 2007, pp. 650-656.
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