The Design Of The Data Acquision Card Based On PCI Bus Of PMMW Radar

Passive millimeter wave (PMMW) imaging makes use of the electromagnetic thermal emission of the subject and reflected thermal signals from the background. Passive millimeter wave imaging, in comparison to visible or infrared imaging ,has great potential advantage of imaging through fog, clouds, smoke, sandstorms and other poor weather conditions. Current imaging systems relied on mechanical scanning of a single beam across the scene have problems of low spatial resolution and poor sensitivity. During the past several years, due to significant advances in the development of solid state components and high-signal processing technology, multi-beam array imaging systems, which promise an increase in sensitivity and resolution, have received considerable interest in both the military and civilian applications. As an important part of Passive millimeter wave imaging system, data acquisition system plays an important role in PMMW imaging system performance.In this paper, considering the demands of the system ,based on PCI Bus technology, a high-speed data acquisition system is designed for the item Applied PMMW Radar. The device adopts PCI9054 chip from PLXTech Corporation to design data acquisition and adopts complicated programmable logic device (CPLD) to design the control part of the system.This paper introduces the theory of signal acquisition, basic configuration and timing of PCI bus,basic configuration and function of PCI9054, and respectively discussed the modules, including the A/D,Logical Control, FIFO Memory, PCI Interface. For every module, the dissertation discussed the reason for selecting the chips,the ways and the problems for using the chips.