文中采用FEKO软件对天线罩的瞄准误差进行了仿真分析。直接对真实带罩天线进行仿真,计算量过于巨大,通常工作站难以支持,因此采用等效源方法进行仿真。仿真步骤如下:首先仿真天线口面附近的等效近场;然后将等效近场作为激励源放入天线罩模型中,计算带罩天线远场差方向图;对比带罩与无罩远场差方向图零点位置的变化得出天线罩的瞄准误差。仿真结果与实测结果吻合很好,验证了仿真方法的准确性。

Radome boresight error(BSE) was simulated based on FEKO in this paper. Computing of radome-enclosed antenna directly was too complex to be supported by common work station, so equivalent source method was applied customary. Simulation steps are as follows: firstly, equivalent near field around antenna aperture was calculated; secondly, equivalent near field was placed in radome model as an encouraging source, thus differential far field pattern of antenna enclosed in radome was computed; lastly, radome BSE can be concluded by comparing the far field patterns of antenna with in radome and without radome. The simulation results of radome BSE were close to that by measuring, which proved the validity of the simulation method.