Research on mutual interference evaluation method of global navigation satellite system

With the increase in the international satellite navigation system, satellite navigation frequency resources are already in short supply, and due to commercial, disaster relief and other reasons, the design of the navigation signals and use are more sophisticated, complex. In the same basic bandwidth, there may be multi-navigation signals, by analyzing the intrasystem interference, the designed reasonableness of navigation signals institutional structure can be evaluated, and the overall system performance can be optimized. The band duplication of the satellite navigation system is analyzed, and various methods of the satellite navigation system mutual interference assessment test are comprehensively analyzed, and finally, according to the characteristics of C/A code signal acquisition, carrier tracking and data demodulation in GPS system, the equivalent carrier to noise ratio model based on spectrum isolated coefficient is proposed, and the spectrum isolated coefficient with C/A code interference factor is derived. Through the analysis of simulation results, the validity of the model is verified, which provides support for the subsequent optimal design of a new generation of navigation signals.