A Novel Multipath Mitigation Scheme for GNSS BOC Signals

The modernization process of Global Navigation Satellite System(GNSS) is based on Binary Offset Carrier (BOC) modulation. BOC signals have a better multipath mitigation performance than the legacy BPSK signals. Even though, the position accuracy of GNSS based on BOC signals could not satisfy the requirements of high-precision positioning when multipath signal exists. In this paper, we propose a novel multipath mitigation scheme at code tracking loop, developing a set of reference waveforms and a architecture of code tracking loop architecture for GNSS BOC signals. With this multipath mitigation scheme, the zero-crossing point of the discriminator is unaffected by multipath signals. Simulation results show this scheme can eliminate multipath efficiently, the maximum normalized multipath error envelope (MEE) is only about 0.001Tc.