超高速数据采集系统设计与优化策略研究

为满足雷达信号高速采集实时存储的需求,设计了一个12 bit、200 MS/s的高速采集存储系统。基于CPCI总线解决高速数据传输的需求,并利用雷达信号的特点,提出了采样时间窗的概念,有效降低了采集数据量和数据传输压力。设计了一种二级缓存机制以提高DMA传输效率,并通过数据格式的组合来匹配总线宽度,提高CPCI总线带宽利用率。采用千兆以太网磁盘阵列,解决了海量数据的高速存储问题。系统最终实现的采样速率是200 MS/s,量化精度12 bit,连续采集。

Design and optimization strategy of ultra-high speed data acquisition system

A 200 MS/s data acquisition and real-time storage system is designed in this paper,which satisfies the needs of radar signal acquisition.To ensure high-speed data transmission,CPCI bus is adopted.The concept of sampling time window is proposed, effectively reducing the amount of data collection and data transfer pressure.A secondary cache mechanism is designed to improve the efficiency of DMA transfers,and the re-combination of data formats improves the CPCI bus bandwidth utilization.The high-speed mass data storage problem is solved by the using of Gigabit Ethernet disk arrays.This system finally realizes continuous acquisition and storage,with the sampling rate of 200 MS/s and 12 bit quantization precision.