Research On Multi-Target Tracking Method For Video SAR Based On Shadow

Video SAR technology has the capability of high resolution and high frame rate,and can continuously display the monitoring results,which has important application value in real-time military operations sush as tracking moving targets.Moreover,video SAR has the advantages of traditional SAR,which can provide reliable services with the characteristics of its all-day and all-weather and can greatly enhance the capability of video surveillance in complex environments.As a cutting-edge research issue in the field of video SAR,multi-target tracking has significant theoretical and practical value in improving target recognition and tracking performance.In this thesis,multi-target tracking is mainly studied around the shadows of maneuvering targets.The main research contents are as follows:1.As for the imaging mode of video SAR,the relevant research is mainly studied on the circular spotlight.Then the echo features and phenomenon of defocus and offset of moving targets are analyzed,the reasons for the defocus and deviation of the moving target are discussed and demonstrated through related simulation experiments.In addition,the principle of target shadow formation in video SAR is introduced,and the feasibility of using shadow to track multiple targets is analyzed.2.The method of IMM multi-target tracking based on the moving target shadow is proposed.Aiming at the maneuvering target in the radar scene,its motion characteristics are analyzed.Then multi-motion models are established to describe the possible motion states of moving targets around the radar platform,the method of IMM multi-target tracking based on the moving target shadow is proposed.Compared with the tracking method of a single model,the simulation experiment is carried out to evaluate the tracking effect,and finally the actual measurement data of video SAR published by SNL is used for verification.3.The method of IMM multi-target tracking based on multi-feature fusion of shadow is studied in the field of video SAR.Due to the shift of Doppler energy of the moving target,which occludes the shadow and leads to missed detection.Aiming at the issue,a method to suppress Doppler energy combined with joint PRF is proposed,which can get sharper shadows.Aiming at the problem of ID switching in multi-target encounters,a method based on shadow features is carried out.The tracking method is based on the framework of IMM multi-target tracking,and combines the motion features and appearance features of moving targets during multi-target matching to achieve data association of multi-feature fusion.Finally,the simulation dataset of the video SAR is used for experiments to verify the effectiveness of the method.