基于软件无线电的实时信号分析系统的实现

【作者】 顾善秋；

【导师】 江桦；

【作者基本信息】 中国人民解放军信息工程大学 ， 电路与系统， 2002， 硕士

【摘要】 本文论述了基于软件无线电思想，在一个通用的数字信号处理硬件平台上，针对卫星中频信号，用美国国家仪器公司提供的开发虚拟仪器的LabVIEW平台研制开发了一个实时的数字信号处理系统。它主要包括实时数据采集、频谱监测、信号的自动搜索等模块。 本文涉及了软件无线电的思想及其技术。首先介绍了基于软件无线电思想的硬件开发环境；其次论述了可变速率的带通采样原理，采取了分段整合分析的方法，从而降低了信号的采样率。介绍了LabVIEW下如何通过计算机接口获取数据的过程，数据采集过程中各个参数的算法选择；同时阐述了LabVIEW平台下G语言的特点及构建虚拟仪器的过程，然后介绍了信号分析处理部分采用的频率扩展与FFT相结合的频域分析方法；频谱监测部分各个模块的算法实现；最后给出了信号搜索部分的算法实现及其原理框图。更多还原

【Abstract】 On the basis of the theory of Software Radio, this paper discusses how to design and develop a realtime digital signal processing system in Graphic Programming language on a universal hardware workbench of digital signal processing aiming at satellitic intermediate frequency signal. It involves the modules of realtime data acquisition, spectrium monitoring, signal searching automatically, etc.The structure of hardware is first introduced, then the variable band-pass sampling theorem is discussed. The application of gathering the subsections reduces the sample rate. The paper also discusses the process of data acquisition in LabVIEW by the interface of the computer, as well as the arithmetic choice of parameters in data acquisition. It follows that the description of characteristics of G Programming Language in LabVIEW and the process of building Virtual Instruments. The paper provides a new spectrum analyzing method of the combination of spread spectrum with FFT. At last it gives the arithmetic realization and programming diagram of every part of spectrum monitoring and signal searching.更多还原