必威体育精装版天线馈源等效相位中心的确定方法.doc

摘 要 随着通信、雷达、人造卫星和宇航技术的发展,对天线的跟踪、定位精确度要求越来越高，单靠幅度波束来有哪些信誉好的足球投注网站定位已不能满足要求,必须以天线的相位中心为基准进行精确定位或测量反射面天线的性能与馈源特性密切相关。而在实际工程中，由于反射面受到重力、风、冰、雪等荷载的作用，实际曲面将不再是原来的理想曲面。由于反射面口径的相位分布对辐射特性的影响远大于幅度分布的影响，故进行天线馈源的相位中心的研究，找到馈源相位中心的最佳位置， 以使天线馈源具有近似对称的辐射特性，对于提高反射面天线的整体性能是非常必要的。 本文针对变形抛物面反射面天线馈源相位中心选取的问题，用MATLAB建立模型。该模型基于变形反射面天线馈源相位中心与远场方向图的对应关系，通过对远场方向图的分析，可得到天线反射面存在任意表面误差时的馈源最佳相位中心，使得天线的远场方向图各项指标最好。 关键词：天线 反射面 相位中心 MATLAB 远场方向图 ABSTRACT With the development of communications, radar, satellites and aerospace technology, antenna tracking, positioning accuracy have become increasingly demanding and rely solely on the magnitude of beam search positioning can not meet the requirements of the antenna phase center as a benchmark for accuratepositioning or measuring the performance of reflector antennas and feed characteristics are closely related. As the diameter of the reflecting surface phase distribution of the radiation characteristics is much larger than the amplitude distribution, the phase center of antenna feed, and find the best location of the feed phase center, so that the antenna feed nearly symmetric radiation characteristics, it is necessary to improve the overall performance of the reflector antenna. Reflecting surface by gravity, wind, ice, snow and other loads role in the actual project, the actual surface will no longer be the ideal surface. In this paper, the problem of deformation of the parabolic reflector antenna feed phase center of the selected model using MATLAB. The model is based on the distorted reflector antenna feed phase center and the far-field pattern corresponding relationship obtained through the analysis of the far-field pattern, the antenna reflector there are any surface errors on the feed phase center, making the antenna the far-field pattern of the indicators is best. Keywords: Antenna Reflecting surface Phase center MATLAB Far-field pattern 目录 第一章 绪论 1 引言 1 1.1课题研究的背景和意义 1 1.2天线概述 2 1.2.1天线的种类 2 1.2.2天