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为了分析目标TEz波电磁散射特性,发展了求解二维TEz波电磁散射问题的时域无网格算法。算法涉及的离散点上的空间导数通过在无网格点云结构上引入函数加权最小二乘逼近确定;数值通量则用近似黎曼解计算确定,通量运算涉及的物理量左右状态值,用二次函数重构替代通常的线性重构以提高计算精度,并沿用四步Runge-Kutta格式进行时间推进求解。论文用发展的算法成功模拟了飞行器主体带外挂等模型模拟的二维情形电磁散射场,并给出了对应的双站雷达散射截面(RCS),展示出电磁波照射方向、外挂尺寸以及外挂与主体的相对位置等因素对主体散射特性的影响。
In order to analyze the electromagnetic scattering characteristics of the target TEz wave, a time-domain meshless algorithm for solving the electromagnetic two-dimensional TEz wave scattering problem is developed. The spatial derivative at the discrete points involved in the algorithm is determined by introducing a function-weighted least-squares approximation to the grid-free point cloud structure. The numerical throughput is then approximated by the Riemann solution to determine the state values of the physical quantities involved in the flux calculation. Quadratic function reconstruction replaces the usual linear reconstruction to improve the accuracy of the calculation. The four-step Runge-Kutta format is used to solve the problem. The paper successfully simulates the two-dimensional electromagnetic scattering field simulated by aircraft model with external plug-in model with the developed algorithm and gives the corresponding double-station radar cross-section (RCS), showing the direction of electromagnetic wave irradiation, The relative position and other factors on the scattering characteristics of the main body.