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What is a ROtV?
(Remotely Operated Towed Vehicle )
A Remotely Operated Towed Vehicle (ROTV) is an uncrewed subsea platform that is towed behind a surface vessel while providing active control over its depth and lateral position. Unlike a standard "dumb" towfish that simply follows the ship's path, an ROTV features motorized control surfaces—such as flaps or rudders—that allow it to fly through the water with high precision. Its primary purpose is to serve as a stable, high-speed carrier for complex sensor payloads, enabling efficient wide-area surveys of the seabed or the water column while maintaining a constant altitude or depth despite the surface vessel's movement.
How an ROTV WORKS?
The operational advantage of an ROTV lies in its ability to transform a passive tow into a controlled flight. This is achieved through three integrated systems:
Dynamic control surfaces
The ROTV is equipped with active wings or "flaps" that are adjusted in real-time by onboard actuators. By changing the angle of these surfaces, the vehicle generates hydrodynamic lift or downforce. This allows the ROTV to "fly" at a specific altitude above the seabed or perform lateral maneuvers to offset the ship's drift or to expand the coverage of its sensors.
Real-time telemetry and guidance
A reinforced umbilical cable connects the ROTV to the surface vessel, providing a high-bandwidth data link. Sensors on the vehicle—including altimeters, pressure sensors, and an Inertial Navigation System (INS)—transmit precise motion data to the pilot’s station. The control software uses this feedback to automatically adjust the control surfaces, compensating for the ship's heave and ensuring the sensor payload remains perfectly steady.
