Direct GPS P-Code Acquisition Method Based on FFT

Direct GPS P-Code Acquisition Method Based on FFT

Recently, direct acquisition of GPS P-code has received considerable attention to enhance the anti-jamming and anti-spoofing capabilities of GPS receivers. This paper describes a P-code acquisition method that uses block searches with large-scale FFT to search code phases and carrier frequency offse...

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Veröffentlicht in:Tsinghua science and technology 2008-02, Vol.13 (1), p.9-16
Hauptverfasser: Li, Hong, Lu, Mingquan, Feng, Zhenming
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Sprache:eng
Schlagworte:
code frequency offset
direct acquisition
fast Fourier transform (FFT)
GPS P-code
maximum correlation result
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Feng, Zhenming
description Recently, direct acquisition of GPS P-code has received considerable attention to enhance the anti-jamming and anti-spoofing capabilities of GPS receivers. This paper describes a P-code acquisition method that uses block searches with large-scale FFT to search code phases and carrier frequency offsets in parallel. To limit memory use, especially when implemented in hardware, only the largest correlation result with its position information was preserved after searching a block of resolution cells in both the time and frequency domains. A second search was used to solve the code phase slip problem induced by the code frequency offset. Simulation results demonstrate that the probability of detection is above 0.99 for carrier-to-noise density ratios in excess of 40 dB·Hz when the predetection integration time is 0.8 ms and 6 non-coherent integrations are used in the analysis.
doi_str_mv 10.1016/S1007-0214(08)70002-6
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subjects code frequency offset
direct acquisition
fast Fourier transform (FFT)
GPS P-code
maximum correlation result
title Direct GPS P-Code Acquisition Method Based on FFT
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