Title: ANALYSIS OF DIRECT P(Y)-CODE ACQUISITION
Author(s): J. B. Lozow
Published in: NAVIGATION, Journal of the Institute of Navigation, Volume 44, Number 1
Pages: 89 - 98
Cite this article: Lozow, J. B., "ANALYSIS OF DIRECT P(Y)-CODE ACQUISITION", NAVIGATION, Journal of The Institute of Navigation, Vol. 44, No. 1, Spring 1997, pp. 89-98.
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Abstract: GPS signal acquisition consists of a two-dimensional search in a timelfiequency space to synchronize a receiuer-generated reference signal with the received GPS signal in code phase and frequency. 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 Ll and L2 frequencies, provides more precise (16 m spherical error probable [SEP]) user positioning and inherently more jamming immunity than does CIA-code. The purpose of this study is to explore the use of existing signal detection concepts for quantifying the time to achieve direct acquisition of the P(y)-code in a jamming environment. Of particular interest is the mitigating effect of parallel processing in reducing acquisition time in the presence of initial (receiver) position, time, velocity, and frequency errors andlor uncertainties.