圆周扫描地基SAR频域三维成像算法  

Circumferential Scanning Ground-based SAR Frequency Domain 3D Imaging Algorithm

作　　者：冯子龙 王彦平 林赟 李洋[1] 申文杰 FENG Zilong;WANG Yanping;LIN Yun;LI Yang;SHEN Wenjie(Radar Monitoring Technology Laboratory,School of Information Science and Technology,North China University of Technology,Beijing 100144,China)

机构地区：[1]北方工业大学信息学院雷达监测技术实验室,北京100144

出　　处：《信号处理》2021年第10期1961-1968,共8页Journal of Signal Processing

基　　金：国家重点研发计划(2018YFC1505103);北京自然科学基金面上项目(4192019);北京市属高校基本科研业务费(110052971921/008)。

摘　　要：圆周扫描地基SAR(GBCSAR)是一种具备三维成像能力的地基SAR系统,其运动轨迹特殊,给三维成像带来难度。后向投影(BP)算法适用于该系统成像,但其计算量巨大,难以实现实时成像。应用于机载圆迹SAR成像的频域算法由于机载圆迹SAR与GBCSAR系统在成像模型和信号模型上都存在差异,因此无法应用于GBCSAR。因此,本文提出了一种针对GBCSAR的频域三维成像算法。本文在GBCSAR系统模型的基础上,推导信号由斜距平面转换到成像平面的解析表达,在频域进行匹配滤波,实现信号的聚焦。之后对本算法的适用条件进行讨论。最终经过仿真实验,本文提出的算法得以验证,并对本文算法与BP算法的成像质量和成像效率进行对比,证明本文提出的频域成像算法可以实现高效成像。Circumferential scanning ground-based SAR(GBCSAR)is a ground-based SAR system with three-dimensional imaging capabilities.Its motion trajectory is special,which makes three-dimensional imaging difficult.The Back Projection(BP)algorithm is suitable for imaging in this system,but its computational complexity is huge and it is difficult to realize real-time imaging.The frequency domain algorithm applied to the imaging of airborne circular-track SAR systems cannot be applied to GBCSAR due to the differences in imaging models and signal models between airborne circular-track SAR and GBCSAR systems.Therefore,this paper proposes a frequency domain 3 D imaging algorithm for GBCSAR.Based on the GBCSAR system model,this paper derives the analytical expression of the signal converted from the slant distance plane to the imaging plane,and performs matched filtering in the frequency domain to achieve signal focusing.The applicable conditions of this algorithm will be discussed later.Finally,through simulation experiments,the algorithm proposed in this paper is verified,and the imaging quality and imaging efficiency of the algorithm in this paper and the BP algorithm are compared,which proves that the frequency domain imaging algorithm proposed in this paper can achieve efficient imaging.

关 键 词：圆周扫描地基SAR 三维成像 频域成像算法 

分 类 号：TN958[电子电信—信号与信息处理]