A new rake-based multipath estimation algorithm in GNSS receivers

Multipath interference is one of the important error sources in most high-performance GNSS receivers. A GNSS multipath estimation algorithm based on a RAKE architecture is proposed to take advantage of multipath signals to improve the GNSS receiver performance, rather than to suppress multipath. The impact of GNSS multipath on the receiver performance is evaluated by analyzing its characteristics. The principles of the proposed Rake-based algorithm in GNSS receivers are described, and then the process of its implement is given. Simulated scenarios of multipath are applied, the algorithm is used to resolve the multipath signal and get the time of arrival (TOA) of the line-of-sight (LOS). The improvement of positioning accuracy of GNSS receivers is confirmed by simulation results.