Doppler Sonar

A Doppler Sonar system measures a vessel’s speed and movement by using the Doppler effect with acoustic signals. It transmits sound waves toward the seabed or water layers and calculates speed based on the frequency shift of the reflected signals. Unlike traditional single-axis logs, Doppler Sonar can provide multi-axis measurements, such as fore-aft and port-starboard speeds, which are essential for precise maneuvering during berthing and docking. These systems are highly accurate even in strong currents and shallow waters, making them critical for large vessels and dynamic positioning operations.