一种水声声速的时频测量综合算法研究

doi:10.3969/j.issn.1000-1158.2022.03.16

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摘要针对飞行时间测量法中信号起振点难以检测而导致的测量误差问题,提出了一种基于时频的综合测量算法,以获得高精度超声波声速。首先运用信号时域互相关法,测量声波飞行的整周期时间;再利用信号频域信息中相位差,获得超声传播群延时信息;最终通过时域与频域综合信息获得高精度的飞行时间测量,从而提高声速的测量精度。声速测量平台采用“FPGA+微处理器”架构,对提出的方法进行验证,实测数据结果表明该声速时频测量算法有效,并具有较好的实用价值。

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	鲍晶晶
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关键词 ：计量学, 声速测量, 时频测量, 互相关法, 飞行时间, 起振点

Abstract：It's difficult to detect the starting point of signal during measuring time-of-flight of sound propagation, caused by which measurement error should be eliminate. A comprehensive measurement algorithm based on time-frequency analysis is proposed to obtain high-precision ultrasonic velocity. Firstly, cross-correlation method within time domain is used to measure the whole cycle time of sound wave traveled; then, phase difference in the signal frequency domain is used to obtain the ultrasonic propagation group delay information; finally, the high-precision time-of-flight measurement is obtained by combining time and frequency domain information, so as to improve the measurement accuracy of sound velocity. By building the sound velocity measurement platform employed “FPGA + microprocessor” architecture, results show that the algorithm is effective and instructive to practice.

Key words： metrology acoustic velocity measurement time-frequency measurement cross-correlation method time-of-flight starting point

收稿日期: 2020-09-14 发布日期: 2022-03-23

PACS:

TB95

基金资助:宁波市自然科学基金(2019A610082)

通讯作者: 蒋志迪(1974-),男,浙江宁波人,宁波大学副教授,研究方向为水声信号处理、嵌入式系统设计、数字集成电路设计与应用。Email: jiangzhidi@nbu.edu.cn E-mail: jiangzhidi@nbu.edu.cn

作者简介: 鲍晶晶(1996-),女,浙江舟山人,宁波大学硕士研究生,研究方向为水声信号处理、水声定位、嵌入式系统设计。Email:1193986081@qq.com

引用本文:

鲍晶晶,蒋志迪,刘尉悦. 一种水声声速的时频测量综合算法研究[J]. 计量学报, 2022, 43(3): 405-411.
BAO Jing-jing,JIANG Zhi-di,LIU Wei-yue. Research on a Time-frequency Measurement Algorithm for Underwater Acoustic Velocity. Acta Metrologica Sinica, 2022, 43(3): 405-411.

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