传感技术学报2026，Vol.39Issue(1)：51-57,7.DOI:10.3969/j.issn.1004-1699.2026.01.007
一种低信噪比的超声波飞行时间测量方法
A Ultrasonic Time-of-Flight Measurement Method for Low Signal-to-Noise Ratio Application
徐铖 1罗安华 2赵伟国 1沈平平1
作者信息
- 1. 中国计量大学计量测试工程学院,浙江 杭州 310018||浙江省流量计量技术研究重点实验室,浙江 杭州 310018
- 2. 贵州省计量测试院,贵州 贵阳 550003
- 折叠
摘要
Abstract
In order to solve the inaccurate positioning of feature points and low accuracy resulted from the high noise in echo,A low sig-nal-to-noise ratio(SNR)ultrasonic time-of-flight measurement method is proposed.The empirical wavelet transform is used to decompose the low-frequency sampled echo signal adaptively.The noise reduction and reconstruction of the echo are realized according to the corre-lation between the decomposition component and the original signal.Subsequently,the similarity of waveforms is evaluated by computing the cosine distance between the reference echo and the reconstructed echo and the echo characteristic peak is determined.Finally,the new data sequence is composed of the mapping data of reference echo data and the reconstructed echo data at the characteristic peak.The echo characteristic point is located by the data sequence and the accurate measurement of flight time is obtained.The experimental results show that the echo feature points are located accurately and the time of flight is measured accurately at low sampling rate.The performance of the field ultrasonic flowmeter is effectively improved.关键词
气体超声流量计/经验小波变换/余弦距离/高频数据映射/回波特征点Key words
ultrasonic gas flowmeter/empirical wavelet transform/cosine distance/high-frequency data mapping/echo feature point分类
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徐铖,罗安华,赵伟国,沈平平..一种低信噪比的超声波飞行时间测量方法[J].传感技术学报,2026,39(1):51-57,7.
