Analysis of Direct P-Code Acquisition

J.B. Lozow

Abstract:	Global Positioning System (GPS) signal acquisition consists of a two-dimensional search in a time/frequency space to synchronize a receiver-generated reference signal with the received GPS signal in code phase and fre- quency. User uncertainties in code phase and frequency offsets determine the size of the region to be searched, and hence, the code acquisition time. Encrypted P(Y) code, transmitted on L 1 and L2 fiequen- ties, provides more precise (16 m - spherical error proba- ble (SEP)) user positioning inherently more jamming immunity than does C/A code. The purpose of this study is to explore and use existing signal detection concepts to quantify the time to achieve direct acquisition of the P(Y) code in a jamming environ- ment. Of particular interest is the mitigating effect paral- lel processing has in shrinking acquisition time in the presence of initial (receiver) position, time, velocity, and frequency errors and/or uncertainties.
Published in:	Proceedings of the 52nd Annual Meeting of The Institute of Navigation (1996) June 19 - 21, 1996 Royal Sonesta Hotel Cambridge, MA
Pages:	263 - 276
Cite this article:	Lozow, J.B., "Analysis of Direct P-Code Acquisition," Proceedings of the 52nd Annual Meeting of The Institute of Navigation (1996), Cambridge, MA, June 1996, pp. 263-276.
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