Research On The Overall Compensation Technology Of Navigation Satellite RF Channel

The Global Navigation Satellite System uses teletext information of the navigation signal to provide location and navigation services to worldwide users.Navigation satellite RF channel is an important channel for generating wireless signals.Non-ideal devices within the RF channel will cause distortion of the resulting navigation signal.The linear distortion of filters cause group delay fluctuations and the non-linear distortion of the power amplifiers causes the out-of-band spectral regeneration.These non-ideal features can seriously affect the signal quality of the navigation signal,thus affecting the positioning accuracy and navigation performance.So it is necessary to compensate for these non-ideal characteristics.At the same time,most of the current compensation technology is proposed just for a single non-ideal features.There is no perfect technology for the overall compensation of the entire RF channel.So the overall compensation for non-ideal characteristics of the study is also urgent and necessary.In order to improve the non-ideal characteristics in the RF channel,this paper models the non-ideal characteristics of the channel and studies its compensation method.The main work of this paper includes the following points: In order to evaluate the influence of the non-ideal characteristics on the navigation signal performance and the improvement of the navigation method,giving indicators of the evaluation of the navigation signal quality;Modeling the non-ideal characteristics of the navigation satellite radio frequency channel.Researching the models of power amplifiers and filters,which mainly cause signal distortion,and the compensation methods corresponding to them.The results are verified by simulation;Taking power amplifier and filter caused by the distortion as a whole component,researching the overall compensation method to these non-ideal characteristics.Proposing a compensation method based on iteration and verifying its effect by simulation.Experimental results show that the compensation can improve the quality of the distortion signal in all aspects.