noun
sonar pulse transmission; pinging
Technical term used in sonar and underwater acoustics; refers to sending out a sound pulse and listening for echoes.
潜水艦は探信音を発して周囲の状況を探る。
The submarine emits a sonar pulse to survey the surrounding situation.
探信によって海底の地形を調べることができる。
By pinging, one can investigate the topography of the seabed.