The Open Remote Sensing Journal

2015, 6 : 11-16
Published online 2015 June 12. DOI: 10.2174/1875413901506010011
Publisher ID: TORMSJ-6-11

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

Su Fu-lin , Li Jun , Gao Jian-jun and Sun Jing
Harbin Institute of Technology, Department of Information Engineering, Harbin Institute of Technology, No. 92, West DaZhi Street Harbin 150001, China.

ABSTRACT

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

Keywords:

Spotlight SAR, polar format algorithm, motion compensation, wavefront curvature correction.