TomoSAR 3D Focusing Method Via Linear Error Estimation Based on Mulipass Subimage Registration

In this paper, a high-precision linear error estimation method based on subimage registration is proposed, to solve the problem that the linear error between tracks affects the focusing effect of multipass TomoSAR. Firstly, establish a multipass TomoSAR echo structure, analyze the effects of linear errors between different tracks on two-dimensional imaging algorithm. Secondly get the image offset between the sub-images to rebuild the trajectory. Finally use of the tomographic three-dimensional imaging algorithm to process the echo, and introduced a three-dimensional auto-focusing algorithm to remove residual motion errors. The effectiveness of the method is verified by simulation experiments.