New Approach for SAR Imaging of Ground Moving Targets Based on a Keystone Transform

• Published in: IEEE geoscience and remote sensing letters Vol. 8; no. 4; pp. 829 - 833
• Main Authors: Yang Jungang, Huang Xiaotao, Jin Tian, Thompson, J., Zhou Zhimin
• Format: Journal Article
• Language: English
• Published: Piscataway IEEE 01.07.2011; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Curvature; Doppler effect; Estimation; Grounds; Image coding; Imaging; Imaging of ground moving targets; keystone transform; Mathematical analysis; Migration; Moving targets; Radar imaging; Radar polarimetry; range cell migration correction; Synthetic aperture radar; synthetic aperture radar (SAR); Transforms
• ISSN: 1545-598X; 1558-0571
• DOI: 10.1109/LGRS.2011.2118739

We propose here a new approach for synthetic aperture radar (SAR) imaging of ground moving targets. The unique characteristic of this approach is that range curvature (i.e., quadratic range migration) can be corrected by a simple processing step. A keystone transform is used to correct range walk (i.e., linear range migration) for all targets without knowing their velocities, and the range curvature is corrected in the range-Doppler domain. The advantage of this approach is that it is simple to implement and can correct range curvature for all targets in one processing step, so that it is computationally efficient. Simulation and experimental SAR data processing results are presented to demonstrate the validity of the proposed approach.