一部分波从所遇到的物体反射回来，形成一种信号，称为回波信号。
A portion of the waves is there reflected from the object encountered and forms what is referred to as the echo signal.
回声测深仪是用来测量水深的一种声学测量设备，其以水中超声波的传播速度为确定条件，利用发射波与反射回波时间差来测量水深。
Echo Sounder is a kind of acoustic measuring depth equipment, which can measure depth with the time between transmitted wave and echo on condition in which the speed of ultrasonic is fixed.
在超声反射回波的数学模型基础上，利用小波滤波方法对超声信号进行预处理，提取强噪声背景中的弱回波信号。
This paper attempts to preprocess ultrasonic signal by wavelet filtering based on the mathematical model of the ultrasonic echo, extracts weak echoes from signal with high noise background.
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