Submarine sonar and the future ultrasonic rangefinder will connect with automation intelligent, and other range finder instrument integration, formed much rangefinder.
而且未来的超声波测距仪将同自动化智能化接轨，与其他的测距仪器集成，形成多测距仪。
2
The frequencies used in sonar systems vary from infrasonic to ultrasonic.
声纳所使用的频率从次声到超声不等。
3
On the base of the active sonar theory, This thesis provide active ultrasonic detecting system that application in low-speed moving object of short-range in shallow sea surroundings.