Testing Of High-speed Data Acquisition System With Display And Control Technology

In radar signal and information processing system,software designed for testing of data acquisition system and display controlling is information connection between the user and the instrument.lt completes the task of testing management as an indispensable analysis tool.In high-speed data acquisition system,signal can be converted from analogue to digit ,and processed promptly by the powerful function of calculation ^ data saving and processing -. graph display > logic decisions > automatic operation,it's also characteristic of friendly paneK flexible function and easy transplant.Compared with "classic" testing and measure tools ,the flexible testing panel can be defined by software according to the various requirements of the users,thus fulfills the processing of radar signal,such as:the matched filtering and sidelobe suppression of radar signal.Besides,the powerful calculation capability and aboundant functions liberaries make possible the powerful capability of data processing.The testing function of the system are composed of personal computer,function hardware(including acquisition circuit and ISA bus technology) and software for controlling.The testing are controlled under the virtual interface by the operator ,which takes in the thoughts of virtual instrument . National Instruments has the mature technology with respect to VI.Here the testing software are developed on the basis of personal computer with the tool of Visual C++ .The testing software are designed to fullfil time-domain wave display,FFT testing,ENOB(effective number of bits) testing,LFM matched filtering and sidelobe suppression testing.The function of the software contains panel controlling,data analysis and processing ,I/O interface etc.All of them are developed with the same tool:Visul C++,which is rarely reported .In this dissertation ,all of the following testing are completed by means of the mutual way realized by the software:ENOB of A/D is 7.38 with signal :25 MHz, acquisition frequency:100MHz,RMS of LFM based band signal is more than 40dB withinTB>1000.Also the software have been applied to wave display of three-coordinates radar simulation system.The main work in this dissertation includes:(1) The working principle and block diagram of the 400MHz high-speed data acquisition system tested are introduced.(2) The method and principle of ENOB testing of data acquisition system in the software are analysized,with relative testing data and analysis given.(3) Relative theory of radar LFM signal are described ..principle of matched filtering and sidelobe suppression of LFM signal in the software are analysized with testing data and analysis given.(4) The implementation of hardware interface and software of the testing control and display system are illustrated .The realization of computer ISA card are described and flow diagram of testing and display control in software are analysized in detail.