"回声测距" can be translated into English as "echo ranging" or "echo sounding" (though "echo sounding" more commonly refers to measuring water depth using sound waves, while "echo ranging" is a broader term for distance measurement via echoes).
In more technical or specialized contexts (e.g., radar, sonar), "range measurement by echo" or "echo-based ranging" could also be used, but "echo ranging" is the most concise and widely recognized term for this general concept.
For example:
Echo ranging is used to determine the distance of an object by measuring the time it takes for an echo to return.
（回声测距通过测量回声返回所需的时间来确定物体的距离。）