1、 毕业设计（ 论文） 题 目马卡天线离轴发射仿真与实现 专 业 通信工程 班 级 学 生 指导教师 2013 年 I 马卡天线离轴发射仿真与实现 摘摘 要要 在空间激光通信系统中，光学天线是一个物镜系统，通过折射、反射 和折射-反射光学系统实现，目前应用比较广泛的是牛顿系统、卡塞格林系 统。卡塞格林天线系统因副镜遮挡造成光能量浪费，本论文就是针对此问 题进行了研究，研究的内容如下： （1）简单介绍了无线激光通信系统，对光学天线的应用和发展动态进 行了简要介绍，并讨论了卡塞格林天线系统的优缺点。 （2） 分析卡塞格林天线的镜面参数， 说明马卡望远镜的基本设计原理。 阐述各种常见的望远镜系统的发展
2、史、结构、功能等。 （3）介绍 ZEMAX 软件的基本参数应用和参数设置，利用 ZEMAX 软件在 序列模式下仿真出卡塞格林系统，分析说明马卡望远镜的各参数的具体意 义。 （4）对马卡天线系统离轴发射建模，分析激光器位置参数的变化对光 斑的影响，找出激光器最佳安放位置，得出激光器发射功率。将发射功率 与功率测试实验相结合，判断出轴偏离程度，再调整系统，进一步提高光 功率。 关键词关键词：激光通信，卡塞格林，天线，离轴，望远镜 II Abstract Newton system and Cassegrain system are accepted commonly in optical ante
3、nna systems as field lens which include refraction system,inflection system and refraction-and-inflection system.However,the potential problem of sheltering ratio in Cassegrain system leads to a loss of effective power of the optical system ,This paper is to solve this problem , the contents of the
4、research are as follows: (1) Briefly Introduced the wireless laser communication system, applicati on and development of optical antenna is introduced briefly, and discussed th e advantages and disadvantages of the Cassegrain antenna system. (2) Analyze the mirror parameter of Cassegrain antenna, il
5、lustrated the b asic principle of design of Cassegrain telescope, the development history 、 var iety、structure of common telescope system . (3) Introduce the basic parameters and parameter setting of ZEMAX soft ware, simulated the Cassegrain system in the sequence mode with ZEMAX software, explain e
6、ach parameter of the Cassegrain telescope. (4) The off-axis emission of Marca antenna system is modeled. Analyze the effect of laser parameters on the change of position of the laser spot, fin d the best position, get the laser transmitting power. The transmit power and power test experiment combined, the axis deviation degree, and then adjust t he system, further improve the optical power. Keywords: Laser communication，Cassegrain，antenna，off-axis，tel
