| Several techniques exist that are used to mitigate the multipath affects from the GPS channel. One such method, developed by Kumar and Lau [11], [12], based on the deconvolution approach is studied, analyzed, and compared with the performance of other techniques. This technique applies equalization algorithms in an unconventional way to estimate and compensate both code delay and carrier phase multipath errors simultaneously in a comprehensive manner. Extensive simulations are carried out to investigate the performance curves obtained with this algorithm and to compare them against some of the other methods that use either specially designed antennas or data and signal post processing. It is demonstrated through simulation results that the de-convolution approach is capable of reducing both code range and carrier measurement errors by orders of magnitude, while others reduce code range errors to some extent without aiding in the carrier phase measurements accuracy. It reduces code range error to the order of 0.01 chips and carrier phase error to the order of 0.1 arcmins. This superior performance makes this algorithm a reasonable good choice for high precision GPS receivers. |
