Multipath mitigation technique for sine-phased binary offset carrier signal

摘要

A new multipath mitigation technique is proposed for sine-phased binary offset carrier (SinBOC) signals in global navigation satellite systems (GNSS) using the concept of code correlation reference waveform (CCRW). The initial CCRW sequence is constructed as the non-zero values only appear at the original PRN code transitions symmetrically, the sign is the same as the latter chip of the code transitions, and the width of the non-zero value is 2Tc/M, where Tc is the code duration and M is the SinBOC modulation order. Then the linear combination of initial CCRW and its replicas with left shift and right shift one chip and scaled down 50% constructs a new improved CCRW. The cross-correlation function (CCF) between the received SinBOC(m,n) signal and the local improved CCRW has only one main peak during the delay range from −1 chip to +1 chip. The improved CCRW is multi-level signal which can be pre-computed and stored in memory. Performance analysis show that although at some cost in code tracking accuracy, the proposed method is unambiguous and has much better multipath mitigation performance than the traditional narrow correlator technology in the whole, and there is no need to add extra correlator.