DocumentCode :
3086623
Title :
A Novel Threshold Setting Method for FFT-based GPS Acquisition
Author :
Cao, X.L. ; Mu, R.Z. ; Yan, Y.P.
Author_Institution :
Dept. of Electron. Syst. Technol., Chinese Acad. of Sci., Beijing
fYear :
2009
fDate :
25-27 March 2009
Firstpage :
497
Lastpage :
501
Abstract :
A FFT-based partial matched filter (PMF) acquisition threshold setting method for fast GPS acquisition is presented. Normal distribution and numerical fitting technique instead of real decision variable (DV) distribution are used in derivation to approximate the threshold expression, and the modification method for the threshold expression is also presented. The threshold expression is based on the individual FFT Doppler bin false alarm probability rather than the convention whole detector false alarm probability. The proposed threshold expression can be adjusted according to the false alarm probability, the noncoherent accumulation (NCA) length and the estimated noise variance. Additionally, how to select the optimal FFT point number is discussed. Furthermore we discuss the implementation of zero-padding FFT with its advantage and limitation. The performance is superior compared to the reference method in terms of signal-to-noise ratio (SNR) when detection and false alarm probabilities are used as measurement criteria.
Keywords :
Global Positioning System; fast Fourier transforms; filtering theory; normal distribution; signal detection; FFT Doppler bin false alarm probability; FFT-based GPS acquisition; FFT-based partial matched filter; PMF acquisition threshold setting method; detector false alarm probability; estimated noise variance; fast GPS acquisition; noncoherent accumulation length; normal distribution; numerical fitting; real decision variable distribution; threshold expression; AWGN; Additive white noise; Computational modeling; Computer simulation; Detectors; Global Positioning System; Matched filters; Signal generators; Signal processing; Signal to noise ratio; FFT; GPS; PMF; acquisition; threshold;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Computer Modelling and Simulation, 2009. UKSIM '09. 11th International Conference on
Conference_Location :
Cambridge
Print_ISBN :
978-1-4244-3771-9
Electronic_ISBN :
978-0-7695-3593-7
Type :
conf
DOI :
10.1109/UKSIM.2009.72
Filename :
4809814
Link To Document :
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