大动态范围太赫兹频段雷达散射截面测量
投稿时间:2020-07-08  修订日期:2020-10-11  点此下载全文
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作者单位E-mail
乔鸿展 天津大学 qiaohongzhan@hotmail.com 
钟凯 天津大学 zhongkai@tju.edu.cn 
史杰 天津大学  
刘阳 天津大学  
刘科飞 天津大学  
徐德刚 天津大学  
姚建铨 天津大学  
基金项目:国家自然科学基金项目(面上项目,重点项目,重大项目)
中文摘要:针对目前太赫兹频段雷达散射截面(RCS)测量动态范围较小的问题,提出了一种结构分段定标结合数据分段处理的大动态范围RCS获取方法。基于相对定标理论分析了单一定标测量方式对RCS测量范围与测量精度的限制,并通过对光滑金属球与圆柱的实验测量进行了验证。通过光滑金属平板的RCS测量讨论了衰减元件的引入对系统测量精度与测量范围的影响。在此基础上,利用结构分段定标结合数据分段处理对弹头模型的RCS进行了测量,成功获得了弹头模型的主要散射特征,实现了目前已知最高的63 dB动态范围,底面与侧面的峰值RCS测量结果与仿真计算结果一致。
中文关键词:雷达散射截面(RCS)  太赫兹;动态范围
 
Large-dynamic-range radar-cross-section measurement in the terahertz band
Abstract:A method to overcome the problem of limited dynamic range in current radar-cross-section (RCS) measuring systems in the terahertz band was proposed, by adopting structural subsection calibration and data subsection processing. The limitation of onefold calibration on the RCS measurement range and accuracy was analyzed based on the relative calibration theory, and verified by experimental measurement of a smooth metal sphere and a smooth metal cylinder. A smooth metal plate was also used to discuss the effect of using signal attenuators on the system measuring range and accuracy. Finally, the measurement of the RCS of a warhead model was realized by structural subsection calibration combined with data subsection processing, and the main scattering characteristics were successfully recognized. The measuring dynamic range reached 63 dB, which should be the highest as far as we know. The measured results accorded well with the simulation results.
keywords:radar cross section (RCS), terahertz, dynamic range
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