The invention relates to an absolute flight time calculation method, a flow velocity calculation method and a flow velocity calculation system, and the absolute flight time calculation method comprises the following steps: searching a maximum peak position of a waveform of a signal wave; intercepting a maximum valve according to the maximum peak position; reducing the cut maximum valve by a preset proportion to form a template valve; starting from the initial position of the waveform of the signal wave, matching the waveform of the signal wave by using a template valve to obtain a first valve which exceeds a preset similarity threshold value as a matched valve; the absolute time of flight of the signal waves is calculated using the peaks of the matched valves. According to the method for determining the matched valve disclosed by the embodiment of the invention, the error of the signal wave amplitude change caused by the environment to the calculation result is eliminated. And the calculation is more accurate. And based on the absolute flight time calculation method, the flow velocity can be calculated more quickly and accurately.

    本发明涉及一种绝对飞行时间的计算方法、流速计算方法和系统,其中绝对飞行时间的计算方法,包括以下步骤:寻找信号波波形最大峰值位置;根据最大峰值位置截取最大瓣膜;将所截取的最大瓣膜缩小预定比例形成模板瓣膜;自信号波波形的初始位置开始,使用模板瓣膜对信号波波形进行匹配,得到的第一个超过预定相似度阈值的瓣膜作为匹配瓣膜;使用匹配瓣膜的峰值,计算信号波的绝对飞行时间。本发明实施例所示出的确定匹配瓣膜的方法,排除了环境造成的信号波幅度变化对计算结果的误差。计算更加精确。且基于这样的绝对飞行时间的计算方法,可以更快速更准确的计算流速。


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    Title :

    Absolute flight time calculation method, flow velocity calculation method and system


    Additional title:

    绝对飞行时间的计算方法、流速计算方法和系统


    Contributors:
    YANG JIAFENG (author) / WANG JIAXIN (author) / WANG CHENYU (author) / ZHANG HAO (author) / LI WENXIANG (author)

    Publication date :

    2025-03-14


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Chinese


    Classification :

    IPC:    G06F ELECTRIC DIGITAL DATA PROCESSING , Elektrische digitale Datenverarbeitung / G01H MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES , Messen von mechanischen Schwingungen oder Ultraschall-, Schall- oder Infraschallwellen / G01P MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION OR SHOCK , Messen der Linear- oder Winkelgeschwindigkeit, der Beschleunigung, der Verzögerung oder des Stoßes / G08G Anlagen zur Steuerung, Regelung oder Überwachung des Verkehrs , TRAFFIC CONTROL SYSTEMS




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    TAKAGI KUNIO / HISHIDA MASAYA | European Patent Office | 2017

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    Free access