Doppler sonar systems

Doppler sonar systems use sound waves to measure the movement of objects underwater, like boats or fish. The system sends out a sound pulse and listens for echoes bouncing back from moving objects. If an object is moving toward the sonar, the returned sound waves are compressed, increasing their pitch; if moving away, they are stretched, lowering the pitch. This shift in pitch, called the Doppler effect, helps determine the speed and direction of the object. Doppler sonar is vital for navigation, fish tracking, and ocean research, providing accurate, real-time data about underwater movement.