基于FEKO的天线罩瞄准线误差分析

摘要

In radar seeker system,the existence of the radome will make the electrical null position of the monopulse antenna difference pattern shifted,and the shifted angle is called boresight error(BSE).BSE is one of the most important specifications of radome,as it directly affects the tracking accuracy of guidance system.In this paper,the FEKO software based on the Multilevel Fast Multipole Method(MLFMM) is used to simulate radome's boresight error and the simulation results are compared with the measured results.The good coincidence between simulation and measured results proves the validity of the simulation method,which can effectively resolve the problem of low calculation precision which is existed in the traditional high-frequency algorithm when used in analyzing the electric property.%对于雷达导引头而言,天线罩的存在会造成单脉冲天线的差方向图零深位置产生偏移,该偏移量称为瞄准线误差。瞄准线误差直接影响制导系统的跟踪精度,是天线罩的重要指标之一。本文利用基于多层快速多极子算法的FEKO软件对天线罩的瞄准线误差进行了分析,并与实测结果进行了比较。测试结果与仿真结果吻合良好,验证了仿真方法的正确性,有效解决了传统的高频近似算法分析天线罩电性能时自身具有的精度偏低等问题。