BRT-MOM-ILDC方法分析海上无人机群目标全极化散射特性

随着海面低慢小群目标威胁性的不断增强，其雷达回波的有效探测受到了世界各国的广泛重视。海杂波影响分析和对目标上精细结构建模这两个问题是海上低慢小目标雷达散射特性仿真研究的重点内容，因此，本文以海上无人机群为分析目标，针对其飞行高度低、受杂波影响大、局部结构反射截面积小的目标特性，综合采用高频双向射线追踪方法（BRT）、多层快速多极子加速的矩量法（MOM）和边缘区域的增量长度绕射理论方法（ILDC）分区域实现可靠的电磁散射建模。该方法将目标区域分为高频电大区域、低频精细区域和棱边区域进行理论分析与计算，采用多路径方法对目标间、目标与海面的耦合作用进行有效的补充，实现全极化海面目标的散射特性高效计算和快速成像。结果分析表明，采用本文方法可以快速的获取全极化的目标散射回波和雷达图像，从而为目标识别提供大量样本信息。 

Fully Polarimetric Scattering Calculation of UAV Targets on Sea Surface by BRT-MOM-ILDC Method

? ?Alongside with the growing battlefield threat of the low-altitude， slow-speed and small-size electric target， worldwide attention has been paid to radar detection of the targets. In terms of simulation on full-polarimetric scattering characteristics about the low-altitude， slow-speed and small-size electric target on sea surface， it is necessary to conduct research on the impacts of clutter waves and fine-structure modeling. Considering these issues， in this paper， the high-frequency bi-directional ray tracking method （BRT）， the method of moments （MOM） with its accelerated algorithm and the incremental length diffraction coefficient （ILDC） method were employed so as to achieve reliable electromagnetic scattering， when the target areas were divided into the large-scale area of high frequency， the electrical small area of low frequency and the edge area which needs theoretical analysis and calculation. Then， the multi-path method served as an addition to the coupling effect among targets and between target and sea. In that case， it is possible to realize efficient calculation and fast imaging about scattering characteristics of sea-surface targets. Simulation results demonstrate that these methods have a positive influence on the detection of the low-altitude， slow-speed and small-size electric target.