Antenna Induced Biases in GNSS Receiver Measurements

Ying Chieh (Jay) Chuang and Inder J. Gupta

Abstract:	We have carried out an extensive investigation of adaptive antenna induced biases in GNSS receiver measurements. Since space only processing (single tap system) leads to less antenna induced biases, we have considered only such adaptive antennas. Further, the antenna weights are adapted to minimize to the total output power under a directional constraint in the satellite direction. It is shown that even when all the elements are similar with the same orientation and there is no coupling between the antenna elements, the antenna induced code phase bias in the presence of interfering signals can deviate from its value in the absence of all interfering signals. The deviation is large in the angular regions surrounding the interfering signals. Even in the angular regions away from interfering signals, there could be some deviation. The coupling between the antenna elements increases the deviation further. When various antenna elements have different orientations (antenna elements are clocked) the deviation in the antenna induced code phase bias increases even when there is no mutual coupling between the antenna elements. Again, coupling between antenna elements increases the deviation in antenna induced code phase bias. Thus, for real world GPS adaptive antenna arrays, one cannot pre-calibrate the antenna for code phase biases.
Published in:	Proceedings of the 2013 International Technical Meeting of The Institute of Navigation January 29 - 27, 2013 Catamaran Resort Hotel San Diego, California
Pages:	164 - 171
Cite this article:	Chuang, Ying Chieh (Jay), Gupta, Inder J., "Antenna Induced Biases in GNSS Receiver Measurements," Proceedings of the 2013 International Technical Meeting of The Institute of Navigation, San Diego, California, January 2013, pp. 164-171.
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