Performance Analysis of Collective Detection of Weak GPS Signals

B.K. Bradley, P. Axelrad, J. Donna, S. Mohiuddin

Abstract:	This paper describes the unique collective detection algorithm used in weak signal environments as well as statistics of its performance in both simulated and live scenarios. Collective detection combines correlations from multiple satellites prior to detection in a direct-tonavigation solution algorithm without performing separate acquisition and tracking functions. In relatively clear conditions, a final positioning accuracy of 15 m was obtained with 3 ms of data, beginning with an a priori uncertainty of ±10 km horizontal, 200 m vertical, and 1 ms in clock. In high blockage environments of a courtyard and balcony 45 m horizontal positioning accuracy was achieved with the same initial uncertainties and 3 to 5 ms of signal samples. These findings demonstrate the utility of collective detection and direct positioning in poor signal environments where conventional tracking and navigation solutions are not feasible. In addition it can provide a robust initialization for or validation of filtered solutions obtained using conventional GPS tracking measurements.
Published in:	Proceedings of the 23rd International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2010) September 21 - 24, 2010 Oregon Convention Center, Portland, Oregon Portland, OR
Pages:	3041 - 3053
Cite this article:	Bradley, B.K., Axelrad, P., Donna, J., Mohiuddin, S., "Performance Analysis of Collective Detection of Weak GPS Signals," Proceedings of the 23rd International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2010), Portland, OR, September 2010, pp. 3041-3053.
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