C波段小频差频率综合器的研究

发布时间：2018-06-06 06:27

本文选题：频率合成 + 锁相环　；参考：《西安电子科技大学》2015年硕士论文

【摘要】：频率综合器一直是通讯、雷达系统中的重要组成部分,特别是在军事国防领域。本课题主要研制目标是为某型号雷达设计一个C波段的频率综合器,要求本振信号形式为点频连续波,激励信号为脉冲线性调频信号,要求任意两部雷达工作频率不同,且相应频率点频率间隔几MHz,要求本频率综合器能够在多部雷达中通用。文章首先介绍了频率综合器的基本概念和发展进程,接着分析了频率综合器的主要技术指标,并对直接式频率综合器、PLL的原理和基本电路进行了详细介绍。通过对频率合成方式的综合分析,讨论其各自优缺点及应用范围,结合所研制频率综合器技术指标要求,确定使用“直接模拟式+DDS”合成方式来实现C波段频率综合器。“小频差”部分考虑了实现的复杂度和应用的通用性等因素之后,选择用锁相电路来实现最为合理和合适,通过以上方式从而实现了C波段小频差频率综合器。本频率综合器可以产生雷达发射激励信号、本振信号、相参基准信号和A/D采样时钟基准信号等,同时具有频率捷变功能、频率控制功能、故障检测功能。文章通过对各关键指标进行分析,给出了具体实现过程,而且详细介绍了各关键电路的设计,同时展示了电路的实物图和频率综合器的整机外形图。最终的实际测试结果也验证了设计的可行性与正确性,最后对系统存在的不足进行了分析并提出了改进思路。
[Abstract]:Frequency synthesizer has been an important part of communication and radar system, especially in the field of military defense. The main goal of this project is to design a C-band frequency synthesizer for a certain type of radar. It is required that the local oscillator signal be in the form of point frequency continuous wave, the excitation signal is a pulse linear frequency modulation signal, and any two radars work at different frequencies. The frequency interval of the corresponding frequency points is several MHz, which requires that the frequency synthesizer can be used in multiple radars. This paper first introduces the basic concept and development process of frequency synthesizer, then analyzes the main technical specifications of frequency synthesizer, and introduces the principle and basic circuit of direct frequency synthesizer (PLL) in detail. Based on the comprehensive analysis of the frequency synthesizer, the advantages and disadvantages and the application range of the frequency synthesizer are discussed. According to the technical requirements of the developed frequency synthesizer, the "direct analog DDS" synthesis method is adopted to realize the C-band frequency synthesizer. After considering the complexity of the implementation and the generality of the application, the "small frequency difference" part chooses the phase-locked circuit to realize the most reasonable and appropriate, and realizes the C-band small frequency difference frequency synthesizer through the above methods. The frequency synthesizer can generate radar excitation signal, local oscillator signal, coherent reference signal and A- / D sampling clock reference signal. It also has the functions of frequency agility, frequency control and fault detection. Through the analysis of the key indexes, the concrete realization process is given, and the design of each key circuit is introduced in detail. At the same time, the physical diagram of the circuit and the outline diagram of the whole machine of the frequency synthesizer are shown. The final test results also verify the feasibility and correctness of the design. Finally, the shortcomings of the system are analyzed and the improvement ideas are put forward.
【学位授予单位】：西安电子科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN74

【共引文献】