水下复杂目标在空间中低频散射场的TSS-FDTD分析  

TSS-FDTD analysis of spatial low-frequency scattering field of underwater complex target

作　　者：杨铭月 郑奎松[1] 吴强 韦高[1] YANG Mingyue;ZHENG Kuisong;WU Qiang;WEI Gao(School of Electronics and Information,Northwestern Polytechnical University,Xi'an 710072,China)

机构地区：[1]西北工业大学电子信息学院,陕西西安710072

出　　处：《中国舰船研究》2023年第4期119-128,共10页Chinese Journal of Ship Research

基　　金：国家自然科学基金资助(61971351);中国电波传播研究所电波环境特性及模化技术重点实验室基金资助。

摘　　要：[目的]随着人类对海洋资源的逐步开发,海面下运行的航行器数量激增,由此带来的对航行器等水下复杂目标的电磁探测问题亟待解决。[方法]基于总场-散射场源时域有限差分方法(TSS-FDTD)和海面上下表面的场值转换算法,分析水下天线阵列源照射水下航行器目标产生散射场的空间分布规律。通过计算得到水下天线阵列与复杂目标附近区域的场分布、整个水下空间的场分布和海面上方的场分布,并将目标与源在不同相对位置的3组模型在空间中的散射场进行对比分析。[结果]结果表明:在海水内部环境中,不同目标模型的散射场差异较大,通过观测该散射场可确定目标的存在;而在海面上空,不同目标模型的散射场差异较小,通过观测其散射场均值和能量分布情况也能确定目标是否存在。[结论]研究结果可为相似工作频段的探测雷达提供数值参考,为水下航行器探测、水下救援、打捞沉船等工程领域提供技术支撑。[Objectives]With the gradual development of marine resources,the number of vehicles operat-ing under the sea surface has rapidly increased,and the problem of the electromagnetic detection of underwa-ter complex targets such as underwater vehicles needs to be solved urgently.[Methods]Based on the total-field scattered-field source finite-difference time-domain method(TSS-FDTD)and the method of field value conversion on the sea surface,the spatial distribution of scattering fields generated by the underwater antenna array irradiation of target underwater vehicles is analyzed.The field distributions in the regions near the under-water antenna array and complex target,in the seawater and above the sea surface are obtained by calculation,and the spatial scattering fields of the three groups with different relative positions of target and source are compared and analyzed.[Results]Through comparison and analysis,the scattering fields of the three groups in the seawater environment are clearly different,and the existence of the underwater target can be determined by observing the scattering fields.While the scattering fields of the three groups above the sea surface show little difference,the existence of the underwater target can be still determined by observing the value and en-ergy distribution of the scattering fields.[Conclusions]The results of this analysis can provide numerical references for detection radar with similar working frequency bands,and provide technical support for the fields of underwater vehicle detection,underwater rescue and sunken ship salvage.

关 键 词：TSS-FDTD 散射场 水下复杂目标 水下阵列天线 

分 类 号：U675.13[交通运输工程—船舶及航道工程]