Improved FFT-based algorithm for GPS signal acquisition

Wei Wang; Pei Chen; Chao Han

doi:10.1117/12.807748

13 October 2008 Improved FFT-based algorithm for GPS signal acquisition

Wei Wang, Pei Chen, Chao Han

Proceedings Volume 7129, Seventh International Symposium on Instrumentation and Control Technology: Optoelectronic Technology and Instruments, Control Theory and Automation, and Space Exploration; 71292R (2008) https://doi.org/10.1117/12.807748
Event: Seventh International Symposium on Instrumentation and Control Technology, 2008, Beijing, China

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.

Citation Download Citation

Wei Wang, Pei Chen, and Chao Han "Improved FFT-based algorithm for GPS signal acquisition", 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); https://doi.org/10.1117/12.807748

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KEYWORDS

Optical filters

Finite impulse response filters

Electronic filtering

Global Positioning System

Computer simulations

Interference (communication)

Filtering (signal processing)

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