A Novel PGA Technique for Circular SAR Based on Echo Regeneration

摘要：

Circular SAR (CSAR) can obtain images of high resolution. However, the image quality is very sensible to sub-wavelength motion errors caused by platform position uncertainty. Due to the limit of accuracy of the inertial measurement units (IMU) systems, a robust autofocus technique has to be used to cope with the demands of CSAR image formation. Because of the serious coupling between range and azimuth, and also the spatial-variant property of the phase error in the spatial frequency domain, the robust Phase Gradient Autofocus (PGA) technique that widely used in conventional spotlight SAR with a straight path can not readily be applied to CSAR. In this paper, a novel PGA technique for CSAR based on echo regeneration is presented to reduce the accuracy requirement from the order of a wavelength to the order of a range cell. The proposed approach is validated via simulation.

关键词： CSAR High resolution PGA Autofocus.

作者: Yun Lin Wen Hong Wei-xian Tan Yan-ping Wang Yi-rong Wu

作者单位: National Key Laboratory of Science and Technology on Microwave Imaging,Institute of Electronics, Chi National Key Laboratory of Science and Technology on Microwave Imaging, Institute of Electronics, Ch

会议类型: 国际会议

会议名称: 2011 IEEE CIE International Conference on Radar(2011年IEEE国际雷达会议RADAR 2011)

会议地点: 成都

会议语种:英文

页码: 411-413

在线出版日期: 2011-10-24（万方平台首次上网日期，不代表论文的发表时间）