Multipath Mitigation Based on Relative Time Delay Estimation

Multipath effects is the major error source in both high accuracy positioning application and in door positioning. Wavelets analysis has very good capability of time-frequency resolution. The method proposed is based on the multi-correlator structure. The Waveltes transform modulus maxima is utilized to detect the singularities of correlation function which is the outputs of the multi-correlator. The LOS(Line of Sight) signal is determined at the most proper scale and the relative time delay is estimated at the finest scale accordingly. The relative time delay is used to mitigate the multipath effects on pseudorange measurement. Simulation results demonstrate that the method proposed is an effective way to mitigate multipath effects.