无线特高频电台设计与实现

发布时间：2018-01-14 12:43

本文关键词：无线特高频电台设计与实现　出处：《西安电子科技大学》2014年硕士论文　论文类型：学位论文

【摘要】：随着时代的变迁,技术的发展,以及战场环境的变化,特高频通信因为其在抗干扰、通信距离、保密性等方面的优势,在军事通信系统中应用愈来愈广泛。收发信机是通信的物理基础,它直接决定了通信的质量,从而决定了整个通信系统的性能。本文的主要工作就是围绕特高频电台做了系统的研究,主要的成果为:1.设计了一套采用中频采样,一次模拟下变频的接收机。针对系统对带宽、接收机灵敏度、成本、调制解调方式和信号处理流程的要求,提出了采用中频采样,一次模拟下变频的结构。合理分配射频、中频和基带的增益,再通过自动增益控制方式,极大的增加了系统的动态范围。设计前端低噪声放大器,优化通道,有效降低了系统的噪声系数,提高了系统的灵敏度和线性范围。2.设计了一套直接上变频的发信机。设计实现了一种双通道、正交调制上变频的发信机。通过对输出级前端功率放大器做阻抗匹配设计,最终可以实现输出信号功率达到28dBm。3.针对射频电路匹配问题做了研究。提出了一种利用ADS仿真软件,配合实际测量和估算来做电路阻抗匹配的方法。通过对器件参数和测试环境的研究,获取工作频点时器件的输入输出阻抗值,再根据ADS的仿真工具,计算设计匹配网络,通过实验测试,效果良好。4.对前端可调谐的带通滤波器做了研究。提出了一种利用变容二极管和高Q值电感搭建的电调谐带通滤波器设计。通过对其做ADS理论仿真,性能良好,带内插损较小,带外衰减达到40dB。5.设计一套基于EP3C55F484C8的数字信号处理平台。数字信号处理平台可完成数字调制解调,以及电台的控制,具备JTAG仿真接口,128位的通用IO,满足对后续实验的需求。最后组成完整的无线特高频电台实验平台,通过做相关的测试工作,平台达到了设计要求。
[Abstract]:With the change of the times, the development of technology, and the battlefield environment changes, UHF Communication because of its communication in anti-interference, distance, confidentiality and other advantages, in military communication system has been widely used. The transceiver is the physical basis of communication, it directly determines the quality of communication, so as to determine the the performance of the whole communication system. The main work of this paper is to do systematic research on UHF radio, the main results are as follows: 1. to design a set of the intermediate frequency sampling, frequency receiver simulation of the system. According to the bandwidth, receiver sensitivity, cost, modulation and demodulation and signal processing requirements. The intermediate frequency sampling, simulation of the frequency structure. The rational allocation of radio frequency, intermediate frequency and baseband gain, then automatic gain control, greatly increasing the dynamic range of the system. The design of front end Low noise amplifier, channel optimization, reduce the noise coefficient of the system, a set of direct conversion transmitter design improves the sensitivity and linear range of.2. system. The design and implementation of a dual channel, orthogonal frequency modulation transmitter. The output stage power amplifier front-end do impedance matching design, finally can achieve the output signal power is 28dBm.3., aiming at the problem of RF circuit is studied. A method is proposed which uses ADS simulation software, combined with the actual measurement and estimation methods to do circuit impedance matching. Through the research on device parameters and test environment, obtain the working frequency when the input and output impedance of the device according to the value of simulation tools ADS, design and calculation of the matching network, through the experimental test, good effect of.4. on the front end of the tunable bandpass filter is studied. A varactor diode and two Inductance built electrically tunable bandpass filter with high Q value. Through simulation, ADS theory for its good performance, with less insert loss, band attenuation reached 40dB.5. design a digital signal processing platform based on EP3C55F484C8. The digital signal processing platform can complete the digital modulation and demodulation, and radio control, with JTAG simulation interface, universal IO 128, to meet the needs of the subsequent experiments. Finally, the wireless UHF radio experimental platform is complete, the related test work platform, meet the design requirements.

【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】：2014
【分类号】：TN924

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