Design And Realization Of High-speed Data Acquisition System And Solving The Problem Of Bottle-neck Of Storage

This paper describes a PCI/PCI-X high-speed continuous acquisition and real-time storge system based on PLX PCI9656. The acquisition rate of the system is 100Msps, and continuous transfer and storage speed is up to 133MB/s. It meets the requirement of continuous acquisition and real-time storge.High-speed Analog-Digital Convert is not the problem nowadays, but real-time storage becomes the bottle-neck of the whole system. For middle-speed acquisition system based on 32bit/33MHz PCI bus of personal computer, its storage media is IDE/ATA hard disk, subject to its restrictions, the stabilized storage rate is between 30MB/s to 50MB/s. So storage is technical bottle-neck of acquisition and storage system. Through extensive research, decided to adopt a server that support 64bit/66MHz PCI-X and SCSI RAID as the computer platform, and RAID constructed by SCSI hard disks as the storage media.This paper describes the principle of sampling and acquisition, and takes the requirement of the acquisition system. Meanwile, it recites the hardware design and WDM driver/MFC application design, including principle validation, simulation, wiring, flowchart of programming. It also emphasizes the problem of bottle-neck of storage, and showes the solution.Using high-performance data recombine methods, adopt RAID0 technology to access maximum disk rate, increasing meomery buffer to improve the efficiency of disk, these optimizations solve the problem caused by the bottle-neck of storage, so that the system can be widely used in the projects that need continuous acquisition and storge in various fields, such as electronic surveillance, radar signal processing, digital communications, video acquisition, spatial information acquisition, etc.