基于C/S构架的高铁地震预警数据采集系统设计∗

摘要

针对高铁地震预警设计了一套基于C/S构架的六通道24 bit数据采集系统。系统硬件由控制板和可拆卸式多通道采集板组成。控制板由STM32F407单片机、SD存储卡和以太网接口组成,完成采集板控制,数据的读取、存储和传输功能；采集板由FPGA控制母版与6个独立的24 bit AD采集卡组成,完成六通道AD同步采样、数据打包和传输功能。服务器通过移植lwip,结合客户端LabVIEW网络编程,完成了C/S构架软件系统设计,实现了数据远程参数设置和波形实时显示等功能。测试结果表明：采集系统通道一致性好,在200 sample/s采样率下每通道数据采集信噪比优于140 dB。%24-bit data acquisition system is designed based on C/S structure for High-speed Railways earthquake early warning,the hardware of system contains control board and detachable data acquisition board. Control board is com-posed of STM32F407 microcontroller,SD memory card and Ethernet interface,the main function of control board con-tains data sampling control,storage and transmission;data acquisition board is composed of FPGA control board and 6-ch 24-bit sampling card,which functions include data sampling,packing and transmission. The C/S structure software is achieved by transplanting LwIP in server,implementing network function by LabVIEW in client,which function in-clude remote parameter setting and data waveform display. The test result shows that:the acquisition system channel consistency is good,and the SNR is better than 140dB on the condition of 200 sample/s sampling rate.