Acquisition of Weak GNSS Signals Using Fast Orthogonal Search

M. Tamazin, A. Noureldin and M. Korenberg

Abstract:	The extreme weakness of a global navigation satellite system (GNSS) signal makes it vulnerable to a wide variety of interfering signals, falling within the GNSS frequency bands. Most of acquisition techniques used now days are depends on Fast Fourier Transform (FFT). The FFT is numerically ill-posed method especially when noise corrupts the signal extensively. Fast Orthogonal Search (FOS) algorithm has been developed to acquire very weak Global Positioning System (GPS) coarse/acquisition (C/A) signals in a software receiver instead of FFT. Simulations indicate that the proposed method can acquire signal below signal-to-noise ratios (SNRs) below 25 dB. The percentage of improvement due to use FOS instead of FFT is 18 % at low SNR.
Published in:	Proceedings of the 25th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2012) September 17 - 21, 2012 Nashville Convention Center, Nashville, Tennessee Nashville, TN
Pages:	1399 - 1405
Cite this article:	Tamazin, M., Noureldin, A., Korenberg, M., "Acquisition of Weak GNSS Signals Using Fast Orthogonal Search," Proceedings of the 25th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2012), Nashville, TN, September 2012, pp. 1399-1405.
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