基于电流相位特性的滑动散射中心建模方法

Modeling method of sliding scattering center based on current phase characteristics

复杂流线型目标通常包含多个滑动型散射中心(sliding scattering center,SSC)。由于SSC位置随观测方位变化而改变,采用现有的散射中心建模方法所获得的SSC属性参数精度受到雷达图像分辨率、多散射中心图像混叠和参数估计精度的限制。本文提出一种基于表面电流相位特性的散射中心建模方法。该方法基于全波法计算的稀疏采样角度下的表面等效电流数据,通过驻相点自适应提取、电流分区,实现目标散射中心的参数化建模。驻相点自适应提取可以精确确定散射中心位置,电流分区计算可以避免多散射中心成分混叠造成的参数提取困难,从而保证了散射中心的建模精度。本文以某导弹和飞机模型为例,采用全波法和传统方法建模计算结果对使用该方法建模的效率和精度进行了验证。

The complex streamlined target usually contains multiple sliding scattering centers(SSCs).The position of the SSC changes with the change of the observation orientation.Therefore,the position of the SSC obtained by the existing scattering center modeling method has many limitations,such as radar imaging resolution,overlap of multiple scattering center images,and the accuracy of extracted parameters.This paper proposes a method for modeling the scattering center based on phase characteristics of surface currents.This method is based on the induced currents under the sparse sampling angle calculated by the full-wave method.Through adaptive extraction of the stationary phase point and current partition,parameterized modeling of scattering centers are realized.The adaptive extraction of the stationary phase point can accurately determine the position of the scattering center and the partition can avoid the difficulty in parameter extraction caused by the aliasing of multiple scattering center components,thereby ensuring the modeling accuracy of the scattering center.This paper takes a missile and aircraft model as an example,and verifies the accuracy of the scattering center model with the results of the full-wave method.