학술논문
弹载SAR子孔径大斜视成像方位空变校正新方法 / New method for azimuth-dependent correction of highly squint missile-borne SAR subaperture imaging
Document Type
Academic Journal
Source
西安电子科技大学学报（自然科学版） / Journal of Xidian University (Natural Science). (4):88-197
Subject
Language
Chinese
ISSN
1001-2400
Abstract
斜视成像是弹载合成孔径雷达（Synthetic Aperture Radar ，SAR）的一种重要工作模式，从实际应用出发，弹载 SAR 为实现快视成像常采用子孔径处理。由于在大斜视模式下，距离方位严重耦合，常规算法成像处理的第1步是采用时域校正距离走动的方法来消除距离方位的耦合，这会带来方位相位随方位位置空变问题，造成方位无法统一处理，影响方位聚焦深度。文中详细分析了弹载 SAR 大前斜瞬时斜距模型，针对子孔径数据，提出一种基于高次相位滤波的方位空变校正新方法，实现方位统一聚焦处理。点目标仿真数据处理验证了文中所提方法的有效性和实用性。
Squinted imaging is one of the most important modes in the missile‐borne synthetic aperture radar ( SAR) . Usually , from the view of practical applications , the missile‐borne SAR adopts subaperture processing in order to implement quick look imaging . In the highly squint mode , the echo signal couples greatly between range and azimuth , so traditional algorithms perform the linear range walk correction in the azimuth time domain firstly to mitigate greatly the range‐azimuth coupling , which causes the problem of position dependent azimuth phase , resulting in the azimuth uniform processing disabled and impacting the azimuth depth of focus (DOF) . Based on the deep analysis of the instantaneous slant range model in the highly squint missile‐borne SAR , this paper proposes high‐order phase filtering to correct azimuth‐dependence for implementing the identical azimuth‐focusing processing . Simulation results validate the effectiveness of the proposed algorithm .
Squinted imaging is one of the most important modes in the missile‐borne synthetic aperture radar ( SAR) . Usually , from the view of practical applications , the missile‐borne SAR adopts subaperture processing in order to implement quick look imaging . In the highly squint mode , the echo signal couples greatly between range and azimuth , so traditional algorithms perform the linear range walk correction in the azimuth time domain firstly to mitigate greatly the range‐azimuth coupling , which causes the problem of position dependent azimuth phase , resulting in the azimuth uniform processing disabled and impacting the azimuth depth of focus (DOF) . Based on the deep analysis of the instantaneous slant range model in the highly squint missile‐borne SAR , this paper proposes high‐order phase filtering to correct azimuth‐dependence for implementing the identical azimuth‐focusing processing . Simulation results validate the effectiveness of the proposed algorithm .