Research Of Compatibility Of Radio Frequency Interference With Beidou Signal

With the continuous progress of satellite navigation technology and the development of remote sensing technology for ground observation,new navigation systems and radar satellites are being used.The distance measurement facilities of airport and personal radio equipment run all the time.The phenomenon of spectrum overlap is becoming common.A growing number of researches focus on the compatibility between different systems.As China's independent satellite navigation system,Beidou navigation system has to face with the threat of various radio frequency interferences.Thus,the compatibility between Beidou navigation system and other RF system is worthy of study.This thesis first described the background of the research and the current development of the navigation industry,and then pointed out the theory of Beidou navigation system and the method of Beidou navigation signal generation.The time-frequency structure of Binary-Offset-Carrier(BOC)signal was analyzed.The characteristics and advantages of BOC modulation were summarized.In this thesis,the software receiver platform based on Beidou navigation was designed.The receiver can work with traditional modulation signal or BOC modulation signal.The traditional acquisition and tracking models were introduced.Meantime,the receiver adopted the acquisition and tracking method for the new BOC modulation signal and improved it.The receiver performance was discussed next,and the receiver performance was evaluated from the capture probability and tracking accuracy.The evaluation criterion of RF interference in the receiver was expounded,and the standard of radio frequency interference assessment was deduced.This thesis showed the performance simulation of the receiver in the background of two potential RF interference.Meanwhile,this thesis analysed the existing evaluation criteria from the perspective of radio frequency interference and simulated it.Next,this thesis gave a verification scheme of physical verification.Finally,the method of using the frequency domain blanking technology to improve the anti-jamming capability of the navigation receiver was presented in this thesis.At the same time,the method was described and simulated under the condition of BOC modulation.And the simulation result was obtained.At last,the characteristics of time-domain blanking and frequency-domain blanking were compared.And the structure of integrated blanking receiver was given.