X频段宽带小步进接收机研究与设计

发布时间：2017-12-26 21:44

本文关键词：X频段宽带小步进接收机研究与设计　出处：《电子科技大学》2016年硕士论文　论文类型：学位论文

更多相关文章： 接收机 小步进 DDS PLL 宽带

【摘要】：随着现代通信机系统的快速发展,频率资源日渐紧迫,射频信道寸土寸金,这对现代接收机系统的性能提出了很高的要求;与此同时,为保证在战场复杂电磁环境下有效接收到通信信号,作为雷达系统的专用接收机,宽带接收变频功能已经成为其最基本的设计要求;本论文围绕上述两点接收机研究过程中的核心问题,对一款工作在X频段的雷达系统专用宽带小步进接收机进行了详细的分析与设计。为解决提高信道资源利用率问题,本论文所设计的接收机系统具备超小步进接收功能,接收信号频率步进为0.0005Hz,论文中就接收机系统的这一优势功能进行了详细的分析设计;通过对原有小步进频率源设计方案的分析和比较,综合直接数字频率合成方案(DDS)和锁相环频率合成方案(PLL),创新性的设计出一种“PLL+DDS+PLL”结构的频率源系统,不仅实现了0.0005Hz的极小步进功能,还具备优秀的相位噪声和杂散性能。多功能宽带变频接收是X频段宽带小步进接收机的一大特点,是本论文设计的另一个重点。论文中所设计接收机系统的宽带变频信道模块不仅具备宽带接收和宽带中频输出功能,同时输出中频信号具有5MHz,10MHz,20MHz三种带宽可选,增益模式可以在手动增益控制(MGC)和自动增益控制(AGC)间切换;整个变频信道模块功能丰富,可以满足接收机系统在不同的环境下使用。为实现该宽带变频信道模块,论文中使用ADS微波射频仿真软件对该模块的各项指标进行了详细的仿真和设计,通过优化器件选型和链路设计的方式,实现了该款宽带变频信道模块。
[Abstract]:With the rapid development of modern communication system, frequency resources increasingly urgent, RF channel Cuntucunjin, which put forward a very high request to the modern receiver system performance; at the same time, in order to ensure the battlefield complex electromagnetic environment effectively received communication signal, the receiver as a special radar system, broadband frequency receiving function has become the the design of the most basic requirements; this paper focuses on the core issues of the two receivers in the research process, for a job in small private broadband radar system X band into the receiver are analyzed and designed in detail. To improve the utilization rate of channel resources, the receiver system designed in this paper have ultra small step signal receiving function, frequency step is 0.0005Hz, the advantage of this system is the receiver function for the detailed analysis and design; through the analysis and comparison of the original design scheme of frequency source into small, comprehensive and direct digital frequency synthesis scheme (DDS) and PLL frequency synthesis scheme (PLL), designed a frequency source system of a "PLL+DDS+PLL" structure of innovation, not only to achieve a very small step into 0.0005Hz functions, but also have excellent phase noise and spurious performance. Multi-function wideband frequency conversion receiving is a major feature of the X band wideband small step receiver. It is another key point in the design of this paper. Broadband frequency channel receiver module design of the system in the thesis not only have broadband receiver and broadband intermediate frequency output, while the output signal is 5MHz, 10MHz, 20MHz three kinds of bandwidth available, gain mode can be controlled in manual gain (MGC) and automatic gain control (AGC) switching frequency; the channel module function is rich, can meet the receiver system used in different environment. In order to realize the wideband frequency conversion channel module, the ADS microwave RF simulation software is used to simulate and design the index of the module in detail, and the broadband frequency conversion channel module is realized by optimizing the device selection and link design.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TN851

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