A fast unambiguous acquisition algorithm for sine-BOC modulated signals

The new Binary Offset Carrier (BOC) modulated signals, where the pseudo random noise (PRN) code is multiplied with rectangular subcarriers, split the spectrum symmetrically and reduce interference with existing navigation signals. In spite of these benefits of the Autocorrelation Function (ACF) for BOC signals, e.g. better multipath mitigation and sharper correlation main peak for better tracking accuracy, its multiple secondary peaks cause ambiguity both in signal acquisition and tracking. In this paper, we propose a new unambiguous acquisition algorithm based on time division correlation (TDC) technique for Sine BOC modulated signals. To evaluate the feasibility of the proposed scheme, taking the BOC sin(1,1) as an instance, its acquisition performance is investigated detailed. Numerical simulation results demonstrate that the TDC-based code acquisition scheme works efficiently for sine BOC signal. It can not only remove the ambiguity without any detection performance degradation, but also reduce the acquisition computation complexity compared with traditional methods.