毫米波接收机信号分析与处理

【作者】 李焱；

【导师】 彭树生；

【作者基本信息】 南京理工大学 ， 信号与信息处理， 2004， 硕士

【摘要】 本文的研究基于3mm波段烟雾测试系统。此系统采用分时工作体制，在主动工作方式时是一台高灵敏度窄带毫米波接收机，用来测量烟雾的插入损耗和散射特性；在被动工作方式时是一台迪克型毫米波辐射计，测量烟雾的辐射特性。本文重点研究和分析了测试系统的工作原理和实现方法。 首先，对烟雾特性的测量原理进行了分析。讨论了辐射特性测量时接收机的系统增益波动对辐射特性测量的影响和为了提高系统测量精度采用的周期定标技术；导出烟雾插入损耗特性测量的计算公式；确定了散射特性测量时接收机的定标方式，并介绍了标准散射体的选择。最后介绍了测量烟雾不同特性时系统的测量方法。 其次，给出了测试系统的电路设计。通过合理的一体化设计，将烟雾的辐射测量、插入损耗测量和散射特性测量的接收电路统一设计，从而使测试系统实现小型化和多功能化。本文对测试系统部分电路的设计进行了介绍。 最后阐述了系统控制软件编写思想和具体实现的程序流程。系统控制软件按模块化原则进行设计，使软件的修改和维护比较方便。考虑到控制软件主要是用在测量上，因此设计了简单明了的人机界面。在附录中列出了部分源程序代码。更多还原

【Abstract】 A 94GHz millimeter wave receiver is studied in detail in this dissertation which is used to measure characteristics of smog. The receiver works on double mode, active and passive, in different time. In active mode, it works as a narrow-band and high sensitive receiver that measures insertion loss and scattering characteristic. And in passive mode, it is a Dicke millimeter wave radiometer that measures radiation characteristic. The system principle and working method are discussed in detail.Firstly, the measuring principle of smog’s characteristics is introduced. The influence is discussed in detail of receiver’s gain fluctuation on measuring radiation characteristic and a radiometer is calibrated periodically to improve measure precision. The measure method of smog insertion loss and RCS are presented with the 94GHz millimeter wave receiver.Secondly, The circuits of the millimeter wave receiver are introduced. By ingenious design, three characteristics of smog can be measured with an same receiver. Thereby the system becomes multifunction and miniaturization.Finally, The principle of controlling software and the flow chart are introduced. This software is programmed in module and is designed with friendly operation bench interface, with C language.更多还原