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Reduced-Size FFT Correlation Techniques for GPS Signal Acquisition
Evolution in Networks and Computer Communications
© 2011 by IJCA Journal
Number 2 - Article 3
Year of Publication: 2011
Abstract
Signal acquisition is the primary step in a GPS receiver. In this paper, frequency-domain methods of GPS L1 signal acquisition are proposed that use reduced number of FFT points to perform circular correlation for faster as well as reliable acquisition. The possibility of reduction has been considered by analyzing the spectrum of C/A code alone. Simulation of various FFT sizes are carried out on MATLAB and the results are verified by those obtained from the GPS Signal Tap Receiver. Besides, the performances of reduced-size FFT correlation techniques are compared and evaluated using different lengths of noncoherent pre-integration period.Reference
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- Accord GPS Signal Tap User’s Guide, Accord Software & Systems Private Limited, Bangalore, India, April 2004.