Design Of Free Waveform Signal Generator Based On PCI Bus

When concerning long range transmission in the sea, sound wave has the best performance in all kinds of energy we have been familiar with. The sound wave from sonar transmit array or sources arrives sonar receiver array through the sea, then be dealt with sonar system, and the judgment can be made accordingly. As a result, we can learn whether or not there is an object, and the state parameter, the kind of object or even recover the information that transmitted by the source. That is the whole working process of the sonar system.When detecting the underwater target, what we are interested in is the ways to improve detection ability. The main technology for the transmit array of active sonar in the improvement of detection ability is whether increase transmit power or form sharp direction function. When the transmit power of active sonar is fixed on, the direction of array should be improved in order to increase the detection distance. The reverberation in shallow sea can be restrained at the same time, which provide a good condition for further signal processing. If the transmit array has a certain shape, in order to improve the direction of the array, the original transmit phase of the transmit array should be calculated and regulated, from which a sharp wave bind can be formed in the detection direction. As a result a set of multi-channel signal source that the phase of every channel can be regulated separately is needed.In this paper, the history, classification and the key guideline of waveform generator system was introduced firstly, and then the research direction of the waveform generator system was presented briefly. And then, the composing and design measure of hardware system was introduced carefully. Meanwhile, PCI Bus interface design, digital signal processing device interface design, field programming logical controller design, digital to analog exchange and synchronize circuit design were related and analyzed separately.The key of this paper was software design of waveform generator system. We introduced the Bootloader program of DSP system, Windows 2000 operating system device driver software, and Graphic User Interface (GUI) software design separately. Especially, the GUI software is the main department of software system. At last, we related the computation of sonar signal form, and analyzed the generate method of white noise signal carefully.