基于相位差法海水声速测量系统设计  

Design of seawater sound velocity measurement system based on phase difference method

作　　者：吴黎杰 蒋志迪 张晴月 WU Li-jie1, JIANG Zhi-di2 , ZHANG QING-yue1(1. Institute of Circuits and Systems,Ningbo University,Ningbo 315211, China; 2. Faculty of Technology, College of Science ＆ Technology Ningbo University, Ningbo 315212, China)

机构地区：[1]宁波大学电路与系统研究所,浙江宁波315211 [2]宁波大学科学技术学院信息工程学院,浙江宁波315211

出　　处：《传感器与微系统》2018年第9期60-62,66,共4页Transducer and Microsystem Technologies

基　　金：浙江省科技计划资助项目(2013C31019)

摘　　要：设计了一种基于相位差法海水声速测量系统,利用信号的相位差变化和相位与时间的线性关系,实现海水声速的高精度测量。系统采用双端口存储单元(DPRAM)和外部存储器接口(EMIF)相结合的方式,实现现场可编程门阵列(FPGA)与单片机之间高速、实时的数据通信。在FPGA+C8051单片机硬件基础上,通过高速AD芯片进行采样,完成数据存储和处理。实验结果表明:相对于标准系统,设计的系统相位差测量不确定度为0. 01,海水声速的测量精度优于0. 02 m/s(k=1),验证了该方案的可靠性。A system based on phase difference method for measuring the sound velocity of seawater is designed.Taking advantage of the linear relationship between phase and time as well as the phase difference change of signal to achieve high precise measurement of sound velocity of seawater. The system adopts the combination mode of dual port RAM（ DPRAM） memory cell and external memory interface（ EMIF） to realize high-speed and real-time data communication between field programmable gate array（ FPGA） and microcontroller unit（ MCU）. On the basis of FPGA and C8051 MCU hardware,through high-speed AD chip sampling,achieve data storage and processing.The phase difference measurement implements the uncertainty of 0. 01 comparing with standards,and the precision of seawater sound speed measurement is prior to 0. 02 m/s（ k = 1）. The experimental results verify the reliability of the proposed scheme.

关 键 词：相位差法测量 现场可编程门阵列 C8051单片机 双端口存储单元 外部存储器接口 

分 类 号：TN98[电子电信—信息与通信工程]