Detection And Imaging Technology Of Bistatic Passive Radar Based On DVB-T Signal

Passive radar has many advantages compared with active radar systems,including low cost,low vulnerability to electronic countermeasure,counter low-flying target penetration and counter-stealth.Passive radar system exploits illuminators of opportunity(lOs)to detect and track targets,so it has a better viability.This thesis applies the technology of broadband synthesis to multiple DVB-T signals,and study the detection and imaging performance of the multiband DVB-T signals:1.A new passive radar detection based on Radon-Fourier transform(RFT)algorithm is proposed.A large time-bandwidth-product signal is first generated by using multiple channels DVB-T signals to improve the detection ability.Then,a Radon-Fourier transform(RFT)algorithm is applied to achieve long-time coherent intergration.The problem of the across range unit(ARU)and phase modulation decoupling is solved by joint searching target moving parameters.The effectiveness of the proposed algorithm is verified by simulation.2.The ISAR imaging algorithm based on multi band DVB-T signal is studied for passive bi-static radar.The resolution of the passive bistatic ISAR is analysed and the RD algorithm is deduced.The influence of different gaps existed between adjacent DVB-T channels on RD imaging is analysed.Simulation results verify the effectiveness of the RD algorithm.3.An ISAR imaging algorithm based on two-dimensional Orthogonal Matching Pursuit(2D-OMP)with DVB-T signal is proposed.The one-dimensional(1D)and twodimensional(2D)compressed sensing imaging algorithm is analysised And 2D-OMP algorithm is deduced.At the same time,the imaging performance of RD and CS under different signal noise ratio is analysised and compared.Experiment results validate the effectiveness of the proposed algorithm.