Research on Wavefront Curvature and Motion Compensation by means of the Spotlight SAR

摘要

Spotlight SAR mode can achieve high resolution radar imaging, but the measurement error, radar platform motionand the other reasons, will make the image suffer the severe defocus and even distortion. This paper introduces therange alignment technology of ISAR imaging to Spotlight SAR imaging,and improved the MD-PGA algorithm, so as tomake motion compensation for the error.Afterwards, with the improved Space-variant post filtering method, compensatethe wavefront curvature error to improve the image quality. Finally the processing results of measured data showed the effectivenessof this method.