GNSS Satellite Navigation System Interference Monitoring Technology Research

Global navigation satellite system development until now,it has been widely used in every field.With the rapid development of radio technology,many industries have been planning the specific spectrum,and unauthorized use of the spectrum,resulting in today's electromagnetic environment is very complex.The various disturbances caused by each other,as well as some intentional or unintentional human disturbance,have had a significant impact on the normal operation of the global satellite navigation system.The study of interference has become more and more important in the field of global satellite navigation systems,however,because of beidou system starts late in our country,and the research of overseas for interference is confidential,it makes a lot of problems in this field in China is still in starting stage.This paper mainly do the following work:First of all,the global satellite navigation system composition,the basic principles of signal interference factors such as basic knowledge points were studied and analyzed.In view of China's main use of satellite navigation system is GPS and Beidou system,the main discussion and introduction of the navigation system is GPS and the Beidou system.Secondly,mainly for interference detection technology and interference recognition technology,studying the general common basic interfering signal,and all kinds of interference signals are simulated in Matlab,analysis of the difference between these interfering signals and some characteristic parameters,to establish the corresponding interference data set,to facilitate the interference,you can quickly and effectively identify the specific types of interference signals.Finally,in view of the threshold threshold,this paper proposes a threshold loop updating algorithm,which can improve the efficiency of interference detection in the case of low noise-to-noise ratio.Traditional interference monitoring is prone to false alarms of interfering signals or excessive false alarms of non-interfering signals,considering the problems such as false alarm and false alarm,this paper proposes a double threshold threshold and combines the threshold loop update to reduce the leakage rate and reduce the false alarm probability.Matlab simulation proves the correctness and feasibility of the algorithm,and improves the efficiency of interference monitoring.