An Analytical Study of Fast Acquisition Issues in GPS Exploitation for Electronic Combat

Sultan Mahmood, Colleen Stewart and Neeraj Pujara

Abstract:	The use of Global Positioning System (GPS) in military applications such as electronic combat and precision munitions places stringent requirements on direct P(Y)-code acquisition time (Tacq). This paper presents results of a parametric study of achievable Tacq for a two dimensional search scheme. A recently reported massively parallel code correlation scheme can be enhanced by parallel searching of the frequency uncertainty resulting from velocity and oscillator frequency errors. A Gaussian approximation for the chi-squared PDFs of the detection and false alarm probabilities is used to compute the number of non-coherent integrations required as a function of the GPS C/N’o and the coherent integration time (Tc). This is next used to generate plots of Tc as a function of effective C/N'o (including possible jamming) with Tc as a parameter for a fixed set of position, time, velocity and oscillator errors and a given parallel receiver architecture (with a fixed number of multiple correlators and frequency bins). Easy to use de- normalization formulas are provided that will be helpful in assessing/trading-off receiver complexity and acquisition performance for any other combination of the error sources.
Published in:	Proceedings of the 7th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1994) September 20 - 23, 1994 Salt Palace Convention Center Salt Lake City, UT
Pages:	863 - 870
Cite this article:	Mahmood, Sultan, Stewart, Colleen, Pujara, Neeraj, "An Analytical Study of Fast Acquisition Issues in GPS Exploitation for Electronic Combat," Proceedings of the 7th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1994), Salt Lake City, UT, September 1994, pp. 863-870.
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