基于散射中心模型的目标时域回波快速仿真

Fast simulation of target time-domain echo based on scattering center model

摘要:

为快速获取超宽带电磁脉冲激励下雷达目标在时域上的电磁响应，提出一种基于属性散射中心正向建模的方法用于目标时域回波仿真。从目标几何模型出发，利用射线追踪、分集技术对空间中所有射线进行标记与归类，分离并定量表征目标的强散射源。基于属性散射中心模型，正向确定模型参数，构建出目标属性散射中心模型，在选定的辐射源激励下进行仿真计算，快速获取目标时域回波信号。以典型目标简化坦克为例，选取不同形式的超宽带电磁脉冲信号作为辐射源，基于正向建模方法构建简化坦克的散射中心模型，快速获取给定电磁脉冲激励下的雷达回波信号，并与利用高频仿真方法得到的一维距离像对比，结果具有较好的一致性，从而验证了利用散射中心模型快速进行不同辐射源激励下回波仿真的有效性。

Abstract:

A forward modeling method is proposed based on attribute scattering center for target time domain echo simulation in order to quickly obtain the electromagnetic response of the radar target in the time domain under the excitation of Ultra-Wideband(UWB) electromagnetic pulses. Starting directly from the target geometric model, ray tracing and diversity techniques are adopted to mark and classify all rays in space, the strong scattering source of the target is separated and quantitatively characterized. Based on the form of the attribute scattering center model, the model parameters are positively determined, the target attribute scattering center model is constructed, and the simulation calculation is performed under the excitation of the selected radiation source to quickly obtain the target time-domain echo signal. Taking a typical target simplified tank as an example, different types of UWB electromagnetic pulse signals are selected as the radiation source, and a simplified tank scattering center model is constructed based on the forward modeling method to quickly obtain radar echo signals under the excitation of a given electromagnetic pulse. Compared with the one-dimensional distance profile obtained by the high-frequency simulation method, the results of the proposed method have good consistency, which verifies the effectiveness of using the scattering center model to quickly perform echo simulation under the excitation of different radiation sources.