Moving target focusing and parameter estimation based on ROI of multi-channel UWB SAR images

Image domain GMTI methods are very suitable for the multi-channel UWB SAR system. However, present image domain GMTI methods are mainly on the moving target detection and 1D range velocity estimation, but seldom refer to moving target focusing and 2D velocity/position parameter estimation. This paper proposes a new method for moving target focusing and parameter estimation based on the ROI of multi-channel UWB SAR images. As the consequent step after GMTD of image domain, the proposed method firstly focuses the moving target and estimates its relative velocity based on its ROI. Secondly, the method estimates the range velocity of the moving target based on its focused multi-channel images. Finally, the method estimates other parameters, including azimuth velocity, azimuth position and range position. The method has been proved to be valid based on multi-channel UWB SAR data.