无线时差法测流系统时间差计算方法研究  

Research on Time Difference Calculation Method of Wireless Time-Difference Flow Measurement System

作　　者：张祥 张侃侃 邓思滨 李牧紫 石瑞格 ZHANG Xiang;ZHANG Kankan;DENG Sibin

机构地区：[1]中国电建集团中南勘测设计研究院有限公司,长沙410014

出　　处：《科技创新与应用》2025年第12期26-32,共7页Technology Innovation and Application

基　　金：中国电建集团中南勘测设计研究院有限公司科技研发项目(2-2021-03574);中国电建集团有限公司科技研发项目(DJ-ZDXM-2020-54)。

摘　　要：目前国内外对宽河道无线时差法测流系统研究较少,且存在测量精度不高、计算数据不稳定等问题,针对此系列问题,提出一种基于参考波的广义二次互相关法时间差计算方法,通过测量河道水位变幅情况划分不同水位区间段,构建不同水位区间对应的参考波,间接采用广义二次互相关法进行超声波传播时间差计算,有效提高无线时差法测流精度,且避免宽河道无线时差法测流系统采用传统互相关法数据传输量过大实时性差等问题。通过长期在伍市水文站的测量计算与比测表明,该方法计算得到的流量数据与流速仪法一致性较好,平均相对误差仅5%,适用于宽河道无线时差法时间差计算,可为大江大河宽河道无线时差法测流技术的推广应用提供一定的技术基础。At present,there is little research on the wireless time difference method flow measurement system in wide river channels at home and abroad,and there are problems such as low measurement accuracy and unstable calculation data.Aiming at this series of problems,a generalized secondary cross-correlation method time difference calculation method based on reference waves is proposed.Different water level intervals are divided by measuring the variation of river water level,reference waves corresponding to different water level intervals are constructed,and the generalized secondary cross-correlation method is indirectly used to calculate the ultrasonic propagation time difference.It effectively improves the accuracy of current measurement by the wireless time difference method,and avoids the problems of excessive data transmission volume and poor real-time performance in the wireless time difference method flow measurement system in a wide river channel using the traditional cross-correlation method.Long-term measurement,calculation and comparison measurement at Wushi Hydrological Station show that the flow data calculated by this method is in good agreement with the current meter method,with an average relative error of only 5%.It is suitable for calculating the time difference of the wireless time difference method in wide rivers and can provide a certain technical foundation for the popularization and application of the wireless time difference method flow measurement technology in large rivers and wide rivers.

关 键 词：无线时差法 测流系统 参考波 广义二次互相关 时间差 

分 类 号：TV13[水利工程—水力学及河流动力学]