Research On Data Acquisition And Analysis System Based On Virtual Instrument And Wireless Lan Technology

This paper researches and develops a wireless acquisition and analysis system based on MiniDAT Local Area Wireless Network and virtual instrument technology.The system software has been developed by the LabVIEW platform and has the function of signal acquiring, filtering, frequency spectrum analyzing, statistics parameter calculating, convolution and correlation measurementing,database managing, data saving and reading. The signal acquiring module uses the buffer and high-speed hard disk stream technology. The filter module has two sub modules, which is Industrial frequency filter and tunable filter. This paper gives out two methods on Industrial frequency filter, call for MATLAB or LabVIEW programming, and then compares it. The type and topology even IIR/FIR of filter can be selected by the user conveniently. The Statistics module can get the statistical calculations, extreme values and sampling characteristics of signal. The convolution and correlation module can measurement the convolution, deconvolution, autocorrelation and cross correlation. The database management can save the info of data files and query the database. The data save and read module not only can save and read in 4 types, but also can automatically name the data files.The creative points of this paper are the developing work of Cepstrum measurements module that LabVIEW doesen't have and the usage of the property node of table control.The system developed in this paper is proved to be effective by a series of experiments, using relatively less hardware to realize the function of signal testing, analyzing, saving and reading. Data files could be shared and analyzed conviently, the inherent point of virtual instrumentation makes the system upgraded and perfected more easily.