Acquisition Schemes for SofWare GPS Receiver

David M. Lin, James B.Y. Tsui

Abstract:	This paper discloses two new acquisition approaches to improve the efficiency of conventional acquisition methods used in GPS software receivers. The first single side band approach will reduce the process time and search time of the conventional approach by more than half. The second approach is an innovative real number implementation of the delay-and-multiply concept which was developed under complex numbers. Since this new approach uses real numbers instead of complex numbers, it reduces the processing time by more than half. Also, it makes the delay-and-multiply concept more feasible and practical, This paper also introduces a methodology to estimate the noise statistics and develop the threshold for detection. Based on this methodology, the performances of the tsvo new approaches is analyzed, estimated by simulation, and compared against the performance of the conventional approach. The paper concludes with a demonstration of two new approaches with field collected data and recommends a potential application area where the new approaches can be applied.
Published in:	Proceedings of the 11th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1998) September 15 - 18, 1998 Nashville, TN
Pages:	317 - 325
Cite this article:	Lin, David M., Tsui, James B.Y., "Acquisition Schemes for SofWare GPS Receiver," Proceedings of the 11th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1998), Nashville, TN, September 1998, pp. 317-325.
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