CAJ | 학술논문

该文提出了一种基于距离向脉冲压缩体制的机载条带SAR重叠子孔径(OSA)实时成像算法，可直接应用于未采用去斜接收技术的条带机载SAR实时成像处理系统。该算法在距离向采用脉冲压缩技术、方位向采用OSA信号处理方法，能够在成像过程中完成距离徙动校正并消除空变相位误差，得到条带模式下的高分辨率图像。首先分析了条带模式SAR几何关系，然后在脉冲压缩体制下建立了回波模型并对成像流程进行了详细的数学推导，最后对运算量、存储量与成像范围进行了计算分析，对点目标数据进行了仿真，利用实时处理平台对原始数据进行了成像，验证了算法的高时效性。
해문제출료일충기우거리향맥충압축체제적궤재조대SAR중첩자공경(OSA)실시성상산법，가직접응용우미채용거사접수기술적조대궤재SAR실시성상처리계통。해산법재거리향채용맥충압축기술、방위향채용OSA신호처리방법，능구재성상과정중완성거리사동교정병소제공변상위오차，득도조대모식하적고분변솔도상。수선분석료조대모식SAR궤하관계，연후재맥충압축체제하건립료회파모형병대성상류정진행료상세적수학추도，최후대운산량、존저량여성상범위진행료계산분석，대점목표수거진행료방진，이용실시처리평태대원시수거진행료성상，험증료산법적고시효성。
A high-resolution real-time subaperture imaing formation for range direction pulse compression airborne strip Synthetic Aperture Radar (SAR) system is presented. It can be used in no dechirp strip SAR system. By pulse compression in range direction and Overlapped Subaperture Algorithm (OSA) in azimuth direction this algorithm can compensate the range-azimuth cross error and the space variant phase error. In this study, first strip SAR geometry is analyzed and the strip SAR model is derived, and then the processing flow of OSA for range pulse compression strip SAR system is described in detail. Computation load, data storage and limitations of patch are analyzed then. The point-target simulations and live data processing results show the proposed approach is feasible and effective.