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Proceedings Paper

Improved FFT-based algorithm for GPS signal acquisition
Author(s): Wei Wang; Pei Chen; Chao Han
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Paper Abstract

This paper describes a GPS signal acquisition method using FIR decimation filter and FFT. First, FIR decimation filter was used to decimate the digital IF signal after the carrier wipe-off. Then, the C/A code phase and carrier frequency was determined through the processing of FFT-based acquisition method. Finally, the Gaussian noise was added to the digital IF signal to analyze the performance of noise immunity. The model of system simulation was provided and the performances of this method compared with conventional FFT-based acquisition and averaging correlation method was analyzed. The simulation results show that acquisition with FIR decimation filter, compared with FFT-based acquisition without decimation, can reduce computational complexity and speed up the signal acquisition processing, while the max correlation value descends about 10%. Compared with averaging correlation acquisition method, the max correlation value between the received signal and the local C/A code can be improved by an average of 30%. Moreover, this acquisition method has a better performance of noise immunity than other two methods.

Paper Details

Date Published: 13 October 2008
PDF: 7 pages
Proc. SPIE 7129, Seventh International Symposium on Instrumentation and Control Technology: Optoelectronic Technology and Instruments, Control Theory and Automation, and Space Exploration, 71292R (13 October 2008); doi: 10.1117/12.807748
Show Author Affiliations
Wei Wang, Beijing Univ. of Aeronautics and Astronautics (China)
Pei Chen, Beijing Univ. of Aeronautics and Astronautics (China)
Chao Han, Beijing Univ. of Aeronautics and Astronautics (China)


Published in SPIE Proceedings Vol. 7129:
Seventh International Symposium on Instrumentation and Control Technology: Optoelectronic Technology and Instruments, Control Theory and Automation, and Space Exploration

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