基于ISAR成像和散射中心提取的目标RCS近场测量方法  

Near-field Measurement of Target RCS Based on ISAR Imaging andScattering Center Extraction

作　　者：毕志超 张依轩 王楠[1] 杨玉禾 林中朝[1] BI Zhichao;ZHANG Yixuan;WANG Nan;YANG Yuhe;LIN Zhongchao(Key Laboratory of Large-scale Computation Electromagnetic in Shaanxi Province,Xidian University,Xi′an 710071,China;Science and Technology on Antennas and Microwave Laboratory,Xidian University,Xi′an 710071,China)

机构地区：[1]西安电子科技大学陕西省超大规模电磁计算重点实验室,西安710071 [2]西安电子科技大学天线与微波技术重点实验室,西安710071

出　　处：《微波学报》2024年第6期48-53,共6页Journal of Microwaves

基　　金：陕西省重点研发计划项目(2021GXLH-02);西安电子科技大学杭州研究院概念验证基金项目(GNYZ2023XJ0407);中央高校基本科研业务费专项资金资助(QTZX22160、XJSJ23013)。

摘　　要：本研究通过结合逆合成孔径雷达(ISAR)成像和散射中心提取技术,实现了近场测试距离下目标雷达散射截面积(RCS)的有效测量。利用近场球面波修正技术和探头补偿技术减少了近场球面波效应和收发探头对成像质量的影响。对ISAR目标图像采用散射中心提取技术,消除了ISAR目标图像中由于带宽有限所导致的旁瓣效应。文中针对散射中心提取中截断阈值的选取准则进行了深入研究,给出了截断阈值判定的经验公式并结合仿真实验进行了验证。最终利用标准球锥散射体的暗室近场测量数据对文中所提出的方法进行了实测验证,并与多层快速多极子(MLFMA)方法仿真结果吻合良好,验证了文中方法的有效性。In this paper,the effective measurement of the target radar scattering cross section(RCS)area at the near-field test distance is achieved by combining inverse synthetic aperture radar(ISAR)imaging and scattering center extraction techniques.The near-field spherical wave correction technique and probe compensation technique are used to reduce the effect of near-field spherical wave effect and transceiver probe on the imaging quality.The scattering center extraction technique is applied to the target ISAR image to eliminate the side-lobe effect caused by the limited bandwidth in the target ISAR image and to reduce the data storage requirement.The selection criterion of the truncation threshold in the scattering center extraction is studied in depth,and the empirical formula for the determination of the truncation threshold is given and validated with simulation experiments.Finally,the chamber near-field measurements of standard spherical cone scatterers were used to validate the method studied in this paper,and the results agreed well with the multilayer fast multipole simulations,which verified the effectiveness of the proposed method.

关 键 词：雷达散射截面积 二维ISAR成像 近场测量 探头补偿 CLEAN算法 

分 类 号：TN820[电子电信—信息与通信工程]