基于正向建模的目标超宽带电磁脉冲雷达回波仿真

为了快速获取超宽带（ultra-wideband，UWB）电磁脉冲激励下雷达目标的时域电磁响应，提出了一种基于散射中心正向建模的目标时域回波仿真方法.从目标几何模型出发，利用空间射线分集技术对强散射源进行分离，通过模型参数正向确定方法构建出目标的属性散射中心模型，用以表征目标高频电磁散射特性，并在UWB电磁脉冲激励下进行仿真运算，获得目标时域回波信号.以典型目标SLICY为例，基于正向建模的散射中心模型，快速获取不同UWB电磁脉冲激励下的雷达回波信号，与高频仿真方法得到的一维距离像（high resolution radar profile，HRRP）进行对比分析，吻合良好.由此验证了本文提出的回波仿真方法的有效性，为不同辐射源激励下目标的快速电磁响应研究提供了一种新思路.

Targets echo simulation excited by ultra-wideband electromagnetic pulse radar based on forward modeling

In order to obtain the time domain electromagnetic response of radar target excited by UWB electromagnetic pulse, this paper proposes a method of time domain echo simulation based on forward modeling of scattering center. Starting from the target geometric model, we use the spatial ray diversity technique to separate the strong scattering sources, and construct the target attribute scattering center model by using the model parameter forward determination method to characterize the target high-frequency electromagnetic scattering characteristics, and then the simulation operation is performed under the ultra-wideband(UWB) pulse excitation to obtain the target time domain echo signal. Taking a typical target SLICY as an example, based on the scattering center model of forward modeling, the radar echo signals under different UWB electromagnetic pulse excitation are quickly obtained, which is in good agreement with the one-dimensional distance image obtained by high-frequency simulation method. The validity of the echo simulation method proposed in this paper is verified, which provides a new idea for the research on the fast electromagnetic response of targets excited by different radiation sources.