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1.引言由于天线罩瞄准线误差的变化率严重地影响寻的制导系统的稳定性和导引精度,因而要正确计算罩的瞄准线误差及传输性能,使之在各种因素的影响下达到最佳。本文运用二维射线轨迹法计算了天线罩的瞄准线误差和传输系数。此方法既考虑天线罩产生的插入相位的差异和传输系数|T|~2的变化,又考虑了天线口径上的幅值分布和相位分布,因而精度较平均入射角法和对称相位法大大提高。使用这种方法后,可以研究天线罩的各种气动外形对瞄准线误差的影响,可以通过选择材料、壁厚和它的变化规律,调整天线和天线罩的相对位置来减小瞄准线误差。由于在设计阶段就对各种因素进行了考虑,因而在试制时反复修正的次数减少,使成本降低,周期缩短。
1. INTRODUCTION Since the rate of change of the line-of-sight error of the radome seriously influences the stability and guiding precision of the guided system, the error of line-of-sight and the transmission performance of the cowl should be correctly calculated so as to be affected by various factors optimal. In this paper, two-dimensional ray trajectory method was used to calculate the line of sight radome error and transmission coefficient. This method not only considers the difference of the insertion phase generated by the radome and the change of the transmission coefficient | T | ~ 2, but also takes into account the amplitude distribution and the phase distribution on the antenna aperture, so the accuracy is greatly improved compared with the average incidence angle method and the symmetrical phase method . After using this method, we can study the effect of various aerodynamic shapes of radome on the line-of-sight error, and can reduce the line-of-sight error by selecting the material, wall thickness and its variation law and adjusting the relative positions of the antenna and the radome. Since various factors are considered during the design stage, the number of iterations during trial production is reduced, the cost is reduced, and the cycle is shortened.