Terms containing echo detection

Subject	English	Chinese
el.	coherent echo modulation and detection	相干回波调制与检波
chem.	echo detection	回波检测
tech.	echo-ranging detection	回声测距 (法)
space	radio-echo detection	雷达回波探测
busin.	ultrasonic pulse-echo detection	超声波脉冲反射探测