Research of fast acquisition algorithms for BOC signals under lower SNR

The principle of the binary offset carrier (BOC) modulation in GNSS is introduced and its autocorrelation function is analyzed. The common binary phase shift key (BPSK)-LIKE single/double bands acquisition algorithms and also their merits and demerits are studied. Combined with fast Fourier transform (FFT) based code parallel processing architecture, the difference between BOC autocorrelation function and the cross-correlation function of BOC and pseudo-random noise (PRN) is applied as the output of acquisition algorithm. The algorithm which can restrain the ambiguity resulted from the BOC autocorrelation function is given. The simulation results show that, the given algorithm has no energy loss and less computation complexity, and its acceptable minimum signal noise ratio (SNR) is 2 dB smaller than that of other algorithms.