The Design And Implementation Of Adapative Cancellation In Real-time Work Jitter

How to make radar jammers send and receive at the same time has always been a radar confrontation in the key technology and research hot issues.In recent years,with the development of digital technology,making adaptive filtering technology in the radar area applications become possible.With the help of adaptive filtering technology,jammers can effectively avoid the limitations of traditional interference measures,reduce system volume,weight and signal leakage risk,increase tactical mobility and flexibility.In this paper,the adaptive echo cancellation technique is proposed for the simultaneous operation mode of the radar jammer platform,and the minimum mean square delay of the complex digital delay(DRFM)structure jammer system is proposed.-DLMS)structure adaptive cancellation algorithm,and a lot of simulation analysis,and finally based on FPGA to complete the overall jamming system to eliminate the system to verify the effectiveness of this program.Firstly,this paper studies various common adaptive algorithms,and deduces the mathematical model of minimum mean square error(LMS)algorithm,recursive least squares(RLS)algorithm and affine projection(AP)algorithm.Based on the analysis of convergence speed,steady-state error,algorithm complexity and jammer working environment,the adaptive cancellation method of complex VS-DLMS structure is proposed.Under the premise of ensuring low complexity of the algorithm,the convergence speed of the algorithm is improved,Which reduces the steady-state error of the algorithm and enhances the high-speed signal processing capability of the algorithm.Secondly,this paper designs the overall cancellation system based on the complex VS-DLMS algorithm and the DRFM jammer environment.The overall structure block diagram is given.Based on the overall structure block diagram,the structure and working state machine of each function module are designed.Verify that the cancellation system can complete the deception,suppression of two interference modes of interference signal cancellation workFinally,the hardware platform is used to realize and verify the system.The experimental results show that the adaptive cancellation system can effectively cancel the interference signal and the maximum cancellation ratio is more than 20 d B.The cancellationresult is significantly correlated with the target signal,and the target signal High degree of reduction,the system has a good transceiver isolation effect.