Robust Scattering Center Extraction Method for InISAR Imaging Based on Range-Azimuth Profile Reconstruction

The extraction of the scattering center is a key step in the 3D imaging of interferometric inverse synthetic aperture radar (InISAR). Due to the influence of background noise and sidelobes, the existing methods often lead to inaccurate extraction of scattering center, resulting in outlier or loss of point clouds in the reconstructed 3D images. To solve this problem, we propose a robust scattering center extraction method based on range-azimuth profile reconstruction. First, the 1D range profile and the 1D azimuth profile are reconstructed based on autocorrelation matrix eigenvalue decomposition to suppress the background noise, and then the threshold is determined based on the proposed threshold updating mechanism to extract the scattering center accurately. Finally, the effectiveness and superiority of the proposed method are verified by the simulation results.