雷达学报Issue(1)：60-69,10.DOI:10.12000/JR15007
基于图像强度最优的SAR高精度运动补偿方法
A High-precision Motion Compensation Method for SAR Based on Image Intensity Optimization
摘要
Abstract
Owing to the platform instability and precision limitations of motion sensors, motion errors negatively affect the quality of synthetic aperture radar (SAR) images. The autofocus Back Projection (BP) algorithm based on the optimization of image sharpness compensates for motion errors through phase error estimation. This method can attain relatively good performance, while assuming the same phase error for all pixels, i.e., it ignores the spatial variance of motion errors. To overcome this drawback, a high-precision motion error compensation method is presented in this study. In the proposed method, the Antenna Phase Centers (APC) are estimated via optimization using the criterion of maximum image intensity. Then, the estimated APCs are applied for BP imaging. Because the APC estimation equals the range history estimation for each pixel, high-precision phase compensation for every pixel can be achieved. Point-target simulations and processing of experimental data validate the effectiveness of the proposed method.关键词
合成孔径雷达(SAR)/高精度运动补偿/自聚焦后向投影/空变性Key words
Synthetic Aperture Radar (SAR)/High-precision motion compensation/Autofocus back projection/Spatial variance分类
信息技术与安全科学引用本文复制引用
胡克彬,张晓玲,师君,韦顺军..基于图像强度最优的SAR高精度运动补偿方法[J].雷达学报,2015,(1):60-69,10.基金项目
国家自然科学基金(61101170)，博士点基金(20110185110001)和航空科学基金(20142080007)资助课题 （61101170）
