超高速数据采集系统设计与优化策略研究  

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

作　　者：张华[1] 胡修林[1] 马若飞[1] 

机构地区：[1]华中科技大学电子与信息工程系,湖北武汉430074

出　　处：《电子技术应用》2010年第12期86-90,共5页Application of Electronic Technique

摘　　要：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。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 12bit quantization precision.

关 键 词：高速采集 CPCI总线 采样时间窗 二级缓存 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]