Hardware Implementation Of ADS-B Anti-jamming Algorithm Based On Cross Array

Automatic Dependent Surveillance-Broadcast(ADS-B)is a new-type air traffic monitoring technology.The ADS-B system can broadcast the aircraft's flight number,latitude and longitude,altitude,speed and other parameters through the airborne launch equipment,and the ground or other airborne device receives its signal.Compared with the traditional surveillance technology,ADS-B technology has advantages for a wide range of monitoring,high speed,installation and employing easily.ADS-B is widely applied in various air surveillances and airport scene monitoring.However,due to the low power of ADS-B signal,it is vulnerable to interference,resulting in ADS-B receiver can not work properly,seriously threatens the normal communication of civil aviation,but there is no interference suppression function of the receiver in the market.So the development of ADS-B interference suppression system has a high practical value.For the ADS-B interference problem,this paper designs the ADS-B interference suppression system based on the cross array antenna and realizes it in hardware.Firstly,the principle and the applicable condition of the power inversion algorithm are analyzed theoretically.Detecting the interference on the basis of the power inversion algorithm and making use of the test results to filter the signal that calculated weights.The feasibility of the jamming algorithm is verified by simulation experiments.Then,the whole hardware composition of ADS-B interference suppression system is introduced,and the development process of the system is described with FPGA(Field-Programmable Gate Array)signal processing board.Thirdly,as the research focus of this paper,the ADS-B interference suppression system is designed,and the configuration needed parameters in the process of system implementation are realized on the MATLAB platform.Then,the concrete realization process of each part is given.Based on the covariance matrix inversion algorithm,a Cholesky matrix based on the common covariance matrix is designed,which can be applied to the inversion of the positive definite Hermite matrix of 3 ~ 8 order.The configuration is simple and convenient.Finally,the test environment is set up to test the real-time performance of the ADS-B interference suppression system.The test results show that the system has good ability of interference suppression.and has practical value.