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摘要随着卫星通信的发展，通信卫星的数量越来越多，而静止同步卫星轨道只有一条，这就要求它能尽可能多地容纳各国所发射的静止同步轨道卫星。近年来为使静止同步卫星轨道能容纳更多的卫星，减小系统间的干扰，卫星天线开始使用多波束天线 (Multiple-beam Antenna)技术以ᨀ高方向性。 本文阐述了对于椭圆口径的阵列单元如何产生一个有着椭圆脚印的平顶主波束的问题。在此基础上，研究了如何在椭圆服务区中心形成一个半径小于椭圆短半轴长的圆形零点。针对静态方向图优化，本文ᨀ出了两种综合方法，并在第二种方法的基础上实现了零陷方向图优化。第一种方法是基于瑞利商来获得恒定相控阵方向图；第二种方法主要利用了迭代的思想。59653
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毕业论文关键词 阵列方向图综合 平顶方向图 波束赋形 零陷方向图
Title multiple beamforming research of elliptic service area
Abstract With the development of communication satellites, the number of communication satellites is increasing. But there is only one static synchronous satellite orbit, which requires it to accommodate static synchronous satellite orbit from various countries as much as possible. In recent years, in order to make the static synchronous satellite orbit can accommodate more satellite and reduce the interference between systems, satellite antenna start using multi-beam antenna (Multiple-beam Antenna) technology to inprove the directionality. This paper describes the problem how to produce a flat-top main beam with elliptical footprint for the elliptical aperture array. On this basis, how the round zero with a radius less than elliptic short half axis can be formed in the center of the service area of the ellipse is disscussed. For static pattern optimization, this paper proposes two integrated approaches, and on the basis of the second method nulling pattern optimization has been achieved. The first method is based on the Rayleigh quotient to obtain a constant phased array pattern. The second approach primarily use the idea of the iterative. Keywords Array pattern synthesis Flat-top pattern Beamforming Nulling pattern
目录
1 绪论.. 6
1.1 研究历史背景和意义. 6
1.2 国内外研究动态.. 6
1.2.1 卫星波束赋形概述 . 6
1.2.2 著名波束赋形综合法及其缺陷 8
1.3 本课题的主要研究内容与论文的组织结构. 8
2 阵列天线理论基础及施密特正交化.. 10
2.1 阵列天线理论基础.. 10
2.1.1 阵列天线基本概念 10
2.1.2 阵列天线基本参数 10
2.2 施密特正交化 14
2.2.1 记法 14
2.2.2 基本思想.. 15
2.2.3 算法 15
2.2.4 不同的形式 16
3 静态方向图优化——基于瑞利商的波束综合法 17
3.1 重构方向图函数和电流分布函数.. 17
3.2 级数截断. 20
3.3 利用瑞利商方法得到cn,l 23
3.4 仿真过程及结果. 25
3.4.1 由圆口径到任意口径. 25
3.4.2 级数截断.. 27
3.4.3 子空间投影 29
3.4.4 求解cn,l
3.4.5 仿真结果.. 32