基于高速信号采集系统累加平均算法研究  

Research on Overlapping Average Algorithm Based on High Speed Signal Acquisition System

作　　者：潘冬阳 南钢洋 白雪 PAN Dong-yang;NAN Gang-yang;BAI Xue(Laser Institute,Qilu University of Technology(Shandong Academy of Sciences),Jinan 250353,China)

机构地区：[1]齐鲁工业大学(山东省科学院)山东省科学院激光研究所,山东济南250353

出　　处：《仪表技术与传感器》2021年第8期122-125,共4页Instrument Technique and Sensor

基　　金：山东省重点研发计划(2019GGX104075);山东省重大科技创新工程(2019JZZY010418)。

摘　　要：为改善高速信号采集系统在复杂噪声背景下重复信号的信噪比,实现触发频率自适应,文中设计并实现了基于现场可编程逻辑门阵列(FPGA)的累加平均滤波算法。论述了使用累加平均滤波算法提高信噪比的基本原理,结合并行流水线结构的特点,搭建了算法的整体架构,具体分析了逻辑控制状态机和数据运算及两级缓存设计。经过调试仿真和光纤温度信号采集系统验证,该算法可在100 MHz全局时钟下对两路光纤温度信号进行高速采集与处理,并对比了光纤温度信号经过4 096次和65 536次累加平均滤波后的波形图,后者比前者信噪比提高了约5 dB。In order to improve the signal noise ratio(SNR)of repeating signal in high-speed signal acquisition system under the complex noise background and realize trigger frequency adaptive,this paper presented an overlapping average filtering algorithm based on field programmable gate array(FPGA).After discussing the principle of using overlapping average filtering algorithm to improve the SNR,combining with parallel pipeline structure characteristic,overall framework of the algorithm was set up and logical control state machine,data operation and two-level cache design were analyzed.By software simulation and verification of the optical fiber temperature signal acquisition system,it can prove that the algorithm has the ability to acquire and process two-channel optical fiber temperature signal under global clock of 100 MHz.Comparing waveform of the signal after 4096 times overlapping average filtering to waveform of 65536 times,the SNR of the latter is about 5 dB higher than the former.

关 键 词：降噪 高速数据处理 FPGA 

分 类 号：TP274[自动化与计算机技术—检测技术与自动化装置]