Highly sensitive weak signal acquisition method for GPS/compass | IEEE Conference Publication | IEEE Xplore

Highly sensitive weak signal acquisition method for GPS/compass


Abstract:

For high sensitivity and operation efficiency in weak signal acquisition of Global Positioning System (GPS) software receiver, a differential coherent accumulated acquisi...Show More

Abstract:

For high sensitivity and operation efficiency in weak signal acquisition of Global Positioning System (GPS) software receiver, a differential coherent accumulated acquisition algorithm based on Fast Fourier Transform (FFT) is proposed. Limitation of coherent combining time is overcome by block accumulation of demodulated GPS intermediate frequency data. Based on FFT frequency shift characteristics, a Doppler circular frequency search is used to achieve low computation instead of frequency compensation search. Loss in frequency is resolved by different down conversions. Compared to the original non-coherent combining, SNR is improved by differential-coherent combining of coherent results. Weak signal in a -39dB poor SNR environment is successfully acquired in experiments. High sensitivity and operation efficiency of the proposed algorithm are confirmed by experiment results.
Date of Conference: 06-11 July 2014
Date Added to IEEE Xplore: 04 September 2014
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Conference Location: Beijing, China

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