The Effects of Non Ideal Channel for Navigation Signal and Research on Pre-distortion Methods

Abstract

In order to provide high-precision satellite navigation services, continuous, high-precision and high-integrity signals should be provided. Non ideal property of each module will result in a certain degree of distortion to the navigation signals and affect. In this paper, channel simulation model based on the actual transmission channel is established firstly. Then, the analysis of independent simulation and that of combining simulation are applied to measure the impact of each module and the whole channel on signal quality. Finally, the corresponding pre-distortion method is put forward to compensate the distortion effects, simultaneously, simulations are compared to verify the performance. The research based on E1 signal is to assess the degree of distortion and the pre-distortion performance using constellation, power spectrum, SCB curve and correlation loss. Simulation results indicate that the program can Improve the constellation by inhibiting the band spectrum of the signal, optimize SCB curve, reduce correlation loss, eliminate the effect on the quality of signals caused by the transmission channel and increase the precision of positioning accuracy, which has great significances and prospects in satellite communication system.