Adaptive Antenna Induced Biases in GNSS Receivers

Christopher Church, Inder Gupta and Andrew O'Brien

Abstract:	It is well known that an antenna can introduce direction dependent biases into the code and carrier phase measurements of GNSS receivers. If the antenna has a fixed pattern, these biases can be calibrated and corrected. However, the pattern of an adaptive antenna changes based on the incident signals and, as a result, so do its bias errors. This study quantifies the variation of adaptive antenna induced code phase biases in the presence of interfering signals. For varying interference scenarios, Monte Carlo simulations are performed to obtain the mean and standard deviation of the antenna induced biases for different space-time adaptive processing (STAP) algorithms. These algorithms include both simple null steering adaptive methods as well as beam forming / null steering techniques. This study determines the degree of accuracy to which an adaptive antenna calibration performed in the absence of interfering signals can be used in the presence of interfering signals.
Published in:	Proceedings of the 63rd Annual Meeting of The Institute of Navigation (2007) April 23 - 25, 2007 Royal Sonesta Hotel Cambridge, MA
Pages:	204 - 212
Cite this article:	Church, Christopher, Gupta, Inder, O'Brien, Andrew, "Adaptive Antenna Induced Biases in GNSS Receivers," Proceedings of the 63rd Annual Meeting of The Institute of Navigation (2007), Cambridge, MA, April 2007, pp. 204-212.
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