中文摘要：

为了实现对天线-罩系统快速高精度的仿真计算，针对瞄准误差常规算法中反复迭代、小步长搜索与复杂窗函数变换等不足，文中引人远场有效观察角的概念，仅考虑极值点附近部分主瓣。并将远场方向图与瞄准误差计算在程序上分离，使用最小二乘法对远场方向图数据进行曲线拟合，通过拟合函数最值直接求解瞄准误差。仿真结果证明，该算法降低了对单个计算点精度的依赖。且在不降低精度的前提下大大提高计算效率。

英文摘要：

In order to achieve high speed and effective simulation of antenna-radome system, according to the shortages such as step-iterations, small-step searching and complex window function transformation in conventional algorithms, in this article, the concept of far-field effective viewing angle was introduced, only small extent viewing angle near extreme point had been considered. The solving of far-field pattern and BSE was separated, far-field pattern was fitted by least square method curve fitting method, and the BSE can be solved by fitting function directly. The simulation result demonstrates that the independence on single point＇ s precision is reduced ; the new arithmetic＇ s efficiency is highly improved without reducing the accuracy.