Moving Target Detection Based On Video SAR Image Sequence

As the demand for information continues to increase,SAR system which only gets stationary scenes cannot meet the demands of mankind.Therefore,the SAR-GMTI system which can detect moving target while imaging stationary scenes has received wide attention from scholars.Traditional SAR-GMTI systems often use multi-channel data cancellation and Doppler frequency domain processing to detect moving targets.The SAR-GMTI algorithm based on multi-channel data has achieved good results.However,the traditional SAR-GMTI system only detects moving targets in a very short time,and lacks continuous observations in the time domain for moving targets,which makes it difficult to estimate parameters such as speed and acceleration of moving targets.With the development of SAR system,the Video SAR system capable of providing high-resolution SAR image sequences or video,provides data support for the combination of SAR image and optical moving target detection algorithm.Based on the high-resolution SAR image sequence and the optical moving target detection algorithm,this paper proposes a moving target detection algorithm based on shadow detection.This paper studies the cause and characteristic of the moving target shadows,and proposes a moving target shadow detection method based on single-frame SAR image.Then we reconstruct the background using the result of moving target shadow detection and using the reconstructed background to improve the initialization process of Vi Be algorithm.Using this method,the "ghosting" phenomenon in the Vi Be algorithm is eliminated and the moving target detection of the SAR image sequence is realized.Phase information is an important feature of backscattering in SAR images,and it has important applications in change detection.However,existing SAR-GMTI algorithms mostly ignore the phase information.In this paper,we use the phase information to propose a moving target trajectory marking algorithm based on coherent change detection.In addition,regarding the moving target detection as the change detection with short time interval,this paper proposes a moving target detection algorithm based on complex SAR image sequence.The algorithm combines the coherent change detection and interframe difference algorithm to enhance the sensitivity of the algorithm.