Acquisition of BOC(n, n) with Large Doppler

The Binary Offset Carrier (BOC) modulation is used in Galileo and new generation of GPS. For the acquisition of BOC (n, n) signal with large frequency offset, a new method named secondary capture is proposed. Based on ASPeCT and Parallel Pseudo - Serial Doppler acquisition, this method consists of two steps. First the whole range of Doppler frequency is searched serially, then Doppler frequency is revised based on fast Fourier transform (FFT). Analysis and simulation results indicate that the method proposed in this paper can reduce capture error and improve capture probability especially for BOC (n, n) signal with large frequency offset.