An improved unambiguous acquisition scheme for BOC(n,n) signals

Binary offset carrier (BOC) modulation signals have been widely adopted in global navigation satellite systems (GNSSs) such as Galileo and modernized global positioning system. Although this kind of modulation offers excellent performances, a main drawback of BOC modulation is that ambiguous acquisition and biased tracking for its multi-peak autocorrelation function (ACF). This article presents herein an improved acquisition technique allows removal of side peaks thoroughly without any residual and acquire much shaper main peak. This scheme is applicable to sine-BOC(n,n) modulation signals. Theoretical analysis and system simulations demonstrate the algorithm proposed has a much better performance in aspect of peak-to-average power ratio compared with other typical algorithms under the influence of additive white Gaussian noise. Meanwhile, we simulate the probability of detection, which demonstrates algorithm proposed here with excellent performance in acquisition.