基于AD9914的Ku波段雷达测试频综模块的研究与实现

发布时间：2018-04-28 05:09

本文选题：雷达系统 + 频率合成　；参考：《电子科技大学》2014年硕士论文

【摘要】：现代无线通信系统的快速发展,使得通信系统对频率合成技术的要求越来越高,尤其是在军事雷达系统中,频率合成技术的一些重要指标会对整个雷达系统产生重要影响。论文首先对国内外雷达系统频率合成技术的发展现状作简要介绍,为论文的开展作铺垫和对比。本文在第二章介绍了频率合成技术的基本概念、主要技术指标以及测试频综模块目前常用的三种基本的频率合成方式等。根据这几种频率合成技术分别展开介绍,分析其优缺点,为论文中雷达系统测试频综模块的方案制定作理论铺垫。由于本文主要是以直接数字频率合成技术为基础进行研究实现的,因此对直接数字频率合成技术的工作原理进行了详细的介绍,分析直接数字频率合成技术的基本结构特点、频谱组成以及其在现代通信领域中的广泛应用。论文第三章和第四章对频率合成方案的设计和模块的实现进行重点介绍。首先论文给出了项目的来源、用途等,根据具体的项目要求进行分析总结。论文通过对测试频综模块指标的仔细分析,给出两种设计方案,一种是传统的频率合成方案,另外一种是基于AD9914的方案。通过对两种方案的分析比较,选择适合该项目要求的频率合成方案,并且把该频率合成方案能达到的目标和项目要求的指标作分析和对比,即给出该方案相应的可行性分析和说明。方案制定完成之后就需要对相关芯片进行选型、介绍,以及给出PCB板图和腔体的设计过程,最终实现了该测试频综模块的硬件电路。论文最后的工作就是对所研制的模块进行调试和测试。文中给出了大量的模块测试图,包括示波器、频谱仪以及信号源分析仪的测试图,并且对测试结果进行分析说明,以验证该模块是否满足项目指标要求。最后还要把此模块放到整个Ku波段雷达测试系统中进行测试和系统连调,通过对整个系统的测试后,再对该测试频综模块作进一步的改进。论文在最后还总结该方案具体实现中所遇到的困难和不足之处,提出改进方法,对该基于AD9914的测试频综模块的进一步研究作铺垫,以更好的满足项目的指标要求。
[Abstract]:With the rapid development of modern wireless communication system, the requirement of frequency synthesis technology is becoming higher and higher. Especially in military radar system, some important indexes of frequency synthesis technology will have an important impact on the whole radar system. Firstly, this paper briefly introduces the development of frequency synthesis technology of radar system at home and abroad, which provides a basis and contrast for the development of this paper. In the second chapter, the paper introduces the basic concept of frequency synthesis technology, main technical specifications and three basic frequency synthesis methods commonly used in testing frequency synthesis module. According to these frequency synthesis techniques, the advantages and disadvantages of these techniques are analyzed, which lays a theoretical foundation for the scheme of radar system testing frequency synthesis module in this paper. Since this paper is mainly based on the direct digital frequency synthesis technology, the working principle of the direct digital frequency synthesis technology is introduced in detail, and the basic structural characteristics of the direct digital frequency synthesis technology are analyzed. Spectrum composition and its wide application in the field of modern communication. The third and fourth chapters focus on the design of the frequency synthesis scheme and the implementation of the module. First of all, the paper gives the source of the project, uses and so on, according to the specific project requirements for analysis and summary. Through the careful analysis of the index of the test frequency ensemble module, two design schemes are given, one is the traditional frequency synthesis scheme, the other is the scheme based on AD9914. Through the analysis and comparison of the two schemes, the frequency synthesis scheme suitable for the project requirements is selected, and the objectives that the frequency synthesis scheme can achieve and the targets of the project requirements are analyzed and compared. The feasibility analysis and explanation of the scheme are given. It is necessary to select the relevant chips, introduce the PCB board diagram and the design process of the cavity, and finally realize the hardware circuit of the test frequency synthesizer module. The final work of this paper is to debug and test the developed module. In this paper, a large number of module test diagrams, including oscilloscope, spectrometer and signal source analyzer, are given, and the test results are analyzed and explained to verify whether the module meets the requirements of the project. Finally, this module is put into the whole Ku-band radar test system to test and adjust the system. After the whole system is tested, the testing frequency synthesis module is further improved. Finally, the paper summarizes the difficulties and shortcomings in the implementation of the scheme, and puts forward an improved method to pave the way for further research of the test frequency ensemble module based on AD9914, so as to better meet the requirements of the project.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN741;TN958

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