Ultra-Short Baseline (USBL)

Ultra-Short Baseline (USBL) is a positioning technology used underwater to determine the location of a submerged object, such as an ROV or equipment. It works by using a ship-mounted transducer array that sends acoustic signals to the target. The target, which has a responder or transponder, then sends signals back. By measuring the time it takes for these signals to travel and the differences in arrival angles, the system calculates the precise position of the target relative to the ship. USBL systems are essential for accurate underwater navigation and operations, especially where GPS signals cannot reach.