CAJ | 학술논문

弹载合成孔径雷达(SAR)为满足机动性和实时性，常采用大斜视子孔径成像处理；而大斜视SAR成像存在严重的距离方位耦合，时域校正距离走动解决这一问题会带来方位聚焦深度问题。针对方位聚焦深度问题以及子孔径特性，该文提出一种新的子孔径成像算法—频域相位滤波算法(FPFA)，该算法在无近似瞬时斜距模型下，采用时域校正距离走动，频域校正弯曲，在方位频域引入相位滤波因子校正多普勒调频率和方位向高次项的空变性，并结合谱分析(SPECAN)技术实现方位聚焦。仿真和实测数据处理验证了该算法的有效性。
탄재합성공경뢰체(SAR)위만족궤동성화실시성，상채용대사시자공경성상처리；이대사시SAR성상존재엄중적거리방위우합，시역교정거리주동해결저일문제회대래방위취초심도문제。침대방위취초심도문제이급자공경특성，해문제출일충신적자공경성상산법—빈역상위려파산법(FPFA)，해산법재무근사순시사거모형하，채용시역교정거리주동，빈역교정만곡，재방위빈역인입상위려파인자교정다보륵조빈솔화방위향고차항적공변성，병결합보분석(SPECAN)기술실현방위취초。방진화실측수거처리험증료해산법적유효성。
The missile-borne Synthetic Aperture Radar (SAR) usually adopts the highly squint mode and subaperture to satisfy maneuvering and the real-time processing, but the signal of highly squint SAR is coupled greatly between the azimuth and range. This issue can be solved by removing the range walk in the time domain, but costs the limitation of focus depth. Due to the depth of focus and the characteristics of subaperture, a new subaperture imaging algorithm—Frequency Phase Filtering Algorithm (FPFA) is proposed in this paper. Without any approximation of the slant range, the range walk can be done in the time domain and the range curvature removed in the frequency domain. Then, a new high-order equation of phase filtering factor is introduced into the frequency domain in order to correct the azimuth-dependence. Finally, the signal is focused in the Doppler domain by SPECtral ANalysis (SPECAN) technique. Both the simulation results and real data processing validate the effectiveness of the proposed method.