Estimation of Adaptive Antenna Induced Code and Carrier Phase Bias in GNSS Receivers

Christopher M. Church and Inder J. Gupta

Peer Reviewed

Abstract:	An approach to estimate the adaptive antenna induced code phase and carrier phase biases in global navigation satellite systems (GNSS) receivers is described. 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 estimation of antenna induced biases. We demonstrate the accuracy of the proposed approach by comparing the estimated biases with the results obtained using computer simulations. In practice, GNSS receivers use early and late time responses to find the peak of the cross-correlation function. Early minus late based discriminators assume the cross correlation function to be symmetrical. Due to the non-linear phase of GNSS antennas (fixed as well as adaptive antennas) over the satellite signal bandwidth, the cross-correlation function may not be symmetrical, leading to an additional bias. In this paper, we also present an extension to our estimation approach to include this receiver induced bias in the antenna bias.
Published in:	NAVIGATION: Journal of the Institute of Navigation, Volume 56, Number 3
Pages:	151 - 160
Cite this article:	Church, Christopher M., Gupta, Inder J., "Estimation of Adaptive Antenna Induced Code and Carrier Phase Bias in GNSS Receivers", NAVIGATION: Journal of The Institute of Navigation, Vol. 56, No. 3, Fall 2009, pp. 151-160.
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