Research On Code Tracking Error In GNSS Radio Frequency Compatibility

Global Navigation Satellite System(GNSS)is one of the hotspots in the field of information.At present,many countries and regions are developing their own satellite navigation system actively,so compatibility has become the focus of attention in the study.In this paper,we consider the influence of data code and multipath interference,and correct the code tracking error.The simulation results show that the code tracking error and its increment caused by intra-system interference and inter-system interference is distributed globally,then draw a meaningful conclusion.The main work of this paper is to solve the problem of code tracking error in GNSS radio frequency compatibility,to study the Spectral Separation Coefficient(SSC)and Code Tracking Spectral Sensitivity Coefficient(CT_SSC),and to analyze the code tracking error caused by noise,intra-system and inter-system interference between C/A,B1 and E1 OS signals,and proposed code tracking error increment,derive its formula.Ignoring the influence of the satellite constellation distribution,through the simulation analysis code tracking error with the correlator interval,Doppler frequency shift changes.Considering the influence of the satellite constellation distribution,the STX combined with MATLAB is used to build constellations around the world and simulate the maximum,minimum and average received powers of each grid signal.Calculate the code tracking error with CT_SSC based on the detailed power spectral density,drawing a two-dimensional earth raster map.And the simulation error of the two cases without multipath and multipath is simulated respectively.Not only in the numerical reflection of its value,but also intuitively see them in the distribution of the whole earth,and finally get a group of valuable conclusions.