Multipath mitigation performance of multi-correlator based code tracking algorithms in closed and open loop model

Abstract

Multipath is one of the dominant error sources in satellite-based positioning. It is a well known fact that the conventional code tracking loop suffers from performance degradation due to the presence of multipath. In past years, several advanced signal processing techniques have been devised to mitigate the multipath induced errors. One particular class of these signal processing techniques is the multi-correlator based feed-forward approach. The multipath performance of these feed-forward techniques has been extensively studied in open loop configuration by the authors in [1], [9]. The goal of this paper is to analyze the performance of these multi-correlator based feed-forward techniques in closed loop configuration, i.e., in the presence of an NCO and a loop filter, in multipath channels. Additionally, the delay tracking methods previously studied for BPSK and Sine BOC signals are also studied here with the newly proposed Multiplexed BOC modulation.