Research On Anti-interference Signal Processing Technology In Polarization Domain For Radio Short-range Detectio

With the development of electronic countermeasures technology,the battlefield environment is becoming more and more complex,and the requirements for the anti-jamming performance of the radio short-range detection system are getting higher and higher.This thesis takes the system of linear frequency modulated continuous wave as the research object,focusing on improving the anti-jamming performance in polarization domain.The main contents are summarized as follows:(1)Aiming at blanket jamming,the principle of virtual polarization changing the antenna receiving polarization is studied,and simulations are carried out under the chirp continuous wave system.Several existing polarization adaptive methods are studied,a depth-first search method based on greedy thinking is proposed and simulated,and the speed advantage of this method is compared and analyzed.Simulated and analyzed the influence of jamming signal polarization and adaptive error on the performance of virtual polarization adaptive technology.The three polarization filtering criteria are simulated and their specific application scenarios are analyzed.(2)Aiming at repeater jamming,the polarization-based suppression method is studied.First,the description method of the target polarization scattering characteristics and the simultaneous polarization system measurement of linear frequency modulated continuous wave are studied,and then the characteristics of the equivalent scattering characteristics matrix of the repeater false target jamming are analyzed.Based on the difference between the characteristics of the target and the false target,A polarization discrimination method for jamming signals of positive and negative frequency modulation continuous wave system was used.Simulated ane analyzed the feasibility of this discrimination method.(3)Designed the process of linear frequency modulation continuous wave polarization suppression of repeater false target jamming,and wrote the program on the FPGA platform to complete the realization of fast Fourier transform,constant false alarm detection and polarization discrimination,and used vivado to capture internal signal data Observations have been made to verify the effectiveness of the polarization discrimination method for the repeater false target jamming of the linear frequency modulated continuous wave detection system.