An Implementation to Mitigate the Effect of Multipath on Positioning Accuracy

In the process of satellite positioning measurement, channel's multipath causes error of positioning. Researches show that multipath will have no effect on positioning accuracy when delays are more than 1 chip away from line of sight signal. A method proposed to extract estimation of multipath delay which is lower than 1 chip, attenuation and phase from the code generator data, local oscillator data and received signal data provided by ordinary loop locked receiver. The method has a robust characteristic under low carrier to noise ratio environment. And also simulation results are provided. Using known pseudo-random-code auto-correlation function, estimation of multipath delay can be further precisely searched. The simulation shows that in most cases the accuracy is within the sampling interval of the known pseudo-random-code auto-correlation function.