多卫星定位系统接收机LNA电路的设计与实现

发布时间：2018-04-16 08:27

本文选题：射频电子线路 + 低噪声放大器　；参考：《武汉邮电科学研究院》2017年硕士论文

【摘要】：卫星定位系统在人们的日常生活中已经随着导航系统的普及深入到了千家万户的日常生活之中。同时,随着信息化时代的持续深入,卫星导航和定位在一个国家的国防安全中也占据着举足轻重的地位。现今世界上主要有四大导航定位系统,它们分别是GPS(美国)、GLONASS(俄罗斯)、GALILEO(欧洲)以及北斗系统(中国)。各个集团为了提升定位系统的定位精度、接收机灵敏度及可靠性等性能,均投入了大量的人力、物力和财力对定位系统中的各种技术和设备进行不断地优化和改良。LNA电路是接收机中对提高接收机灵敏度有决定性作用的模块,所以研究和设计一款用于卫星定位系统的具有良好性能的LNA电路就显得很有价值。本文旨在设计一个服务于前述四种卫星定位系统工作频段下的一种宽带LNA电路。文章在绪论部分对课题相关的背景及一些开头语进行相关叙述。第二章详细介绍LNA的相关知识,包括各性能指标和阻抗匹配的相关分析。第三章对噪声系数进行有关理论的陈述,对级联系统噪声的产生和晶体管电路噪声的形成原因进行了深入研究。第四章是文章的核心部分,对本毕业论文所需要的电路进行设计。并利用相关仿真软件对关键器件和整体链路的各关键指标进行仿真,最后结合各指标的仿真结果,权衡各指标后,选取一个折中值,作为最后的设计方案,在此基础上完成PCB原理图和板图的设计,并完成PCB板的调试,然后对实验结果做出分析。第五章对整个设计的过程中出现的问题,需要优化和改进的地方作一个总结和展望。
[Abstract]:With the popularization of navigation system, satellite positioning system has penetrated into the daily life of thousands of families in our daily life.At the same time, with the continuous deepening of the information age, satellite navigation and positioning in a country's national defense security also occupies a pivotal position.There are four major navigation and positioning systems in the world. They are GPS (Russian GLONASS) and Beidou (China).In order to improve the positioning accuracy, receiver sensitivity and reliability of the positioning system, all groups have invested a lot of manpower.The material and financial resources continuously optimize and improve the various technologies and equipment in the positioning system. LNA circuit is the module in the receiver that plays a decisive role in improving the sensitivity of the receiver.So it is very valuable to study and design a LNA circuit with good performance for satellite positioning system.This paper aims to design a wideband LNA circuit which can be used in the operating frequency band of the above four satellite positioning systems.In the introduction part, the background and some chapeau are related to the topic.The second chapter introduces the related knowledge of LNA in detail, including the correlation analysis of each performance index and impedance matching.In chapter 3, the theory of noise coefficient is presented, and the generation of noise in cascade system and the cause of noise in transistor circuits are studied.The fourth chapter is the core of the article, the thesis needs to design the circuit.The key indexes of the key devices and the whole link are simulated by using the relevant simulation software. Finally, combining the simulation results of each index, after weighing each index, a compromise value is selected as the final design scheme.On this basis, the design of PCB schematic diagram and board diagram is completed, and the debugging of PCB board is completed, and the experimental results are analyzed.In the fifth chapter, the problems in the whole design process need to be optimized and improved to make a summary and prospect.
【学位授予单位】：武汉邮电科学研究院
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN965.5

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