Based On Virtual Instrument Technology Speed Radar Research

With the development of society and the advance of science and technology, computer technical and measure instrument technology is close to combine, making a kind of new measure instruments—Virtual Instrument. Virtual Instrument is a kind of instruments of functional meaning, it is composed of computer, instrument hardware and application software. Generally speaking, it first implements the signal acquisition on special instruments, and then realizes the data display and measure function by virtue of software programming. As a new measure instrument of representative, virtual Instrument has changed the thought of traditional instrument. The test system designed by virtual instrument technology has many advantages such as simple structure, complete function, friendly interface, development cycle short and maintenance debug convenience. Therefore, Virtual Instrument has gotten extensive application in the fields such as automation test and measure.In this paper, the paper first analyzes domestic and international development situation, describes measure principle, then designs the overall scheme. As the aspect of hardware, this article particularly discusses schemes and circuit realization of four function modules, which include radar transceiver, signal pre-amplification circuit, trigger circuit, pretreatment circuit, then introduce the function of data acquisition card PCI-9812. Software design is based on virtual instrument technology, with LabVIEW as system development platform. The article discusses driver interface design, with the method of using call library function. By this way, the data communication is realized between computer and PCI data acquisition card. So the paper designs data acquisition, data reappearance, data process and result display units. Finally, we have made debugging for every part of software and hardware.