Moving Object Detection And Parameter Estimation In SAR/GMTI Leaf Cluster Disturbance Scene

The detection and parameter estimation of the ground moving target is an important direction of SAR/GMTI research.The moving target detection technology can detect the moving targets of vehicles and tanks on the ground,while the parameters estimation can estimate their speed and position.For foliage disturbance environment,this paper presents an improved peak selected Hough transform SAR/ GMTI moving target detection algorithm.On the basis of the target detection,the estimation of Doppler parameters is realized,and a method for solving the equation of motion parameters is presented.The main work of this paper includes the following three parts:(1)Introduced the common foliage clutter modeling method,build scene modeling by the foliage clutter speed motion model.The three channel DPCA system is described,and the DPCA clutter suppression technology is analyzed in detail.(2)For foliage disturbance environment,this paper presents an improved peak selected Hough transform SAR / GMTI moving target detection algorithm.In the range Doppler domain,the target peak signal is linear.The CFAR and other conventional methods can't be used to distinguish the real target and the clutter signal.The proposed algorithm combines the advantages of the Hough transform algorithm to detect the line.The algorithm and the conventional target detection algorithm CFAR are simulated and compared.The simulation results show that the proposed algorithm can maintain a high detection rate in low SNR environment.(3)The estimation of Doppler parameters is realized,and a new method for solving the equation of motion parameters is presented.In the detection of moving target,the target signal is extracted,and the parameters are estimated based on the extracted signal.The parameters include the Doppler frequency,center frequency and moving target motion parameters.In this paper,the application of sub aperture correlation method and signal correlation method is used to estimate the frequency of the signal.Estimate Doppler center frequency by clutter lock method.Based on Doppler parameter estimation,the motion parameters are calculated by using the method of motion parameters.The simulation experiments show that the estimated parameters and the parameters of setting are small,and the results are in line with the expected results.