A new fluid level measurement method , based on ultrasonic measurement , for calculating the velocity of sound and the fluid level is presented . this method points out that a low - power acoustic signal generator under control can be used to emit spread spectrum signals and the fluid level can be worked out by detecting the correlation - peak output of the matching filter whose input is the echo signal received by a microphone 本文提出了一種新的基于擴(kuò)頻通信原理的液位測量方法,使用可控聲源,發(fā)射較低功率的頻譜擴(kuò)展信號(hào),在接收端對(duì)回波信號(hào)進(jìn)行匹配濾波處理,通過檢測相關(guān)峰來確定特征回波的位置,從而計(jì)算出液位。