Real-time Signal Analysis System Based On Software Radio

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.