TOBI, A VEHICLE FOR DEEP OCEAN SURVEY

TOBI is an instrumented vehicle which is towed close to the bottom of the deep ocean from a ship, and uses sound to form detailed images of the sea floor. The paper describes the mechanical design of this vehic le and its instrument package. The way in which sonar images are forme d is discussed and the acoustic design parameters are considered. Sign als are frequency multiplexed on to 10 km of armoured coaxial towing c able, which also provides the power to the vehicle and a two-way commu nication link. At the ship these signals are separated, displayed and logged onto magneto-optical cartridges. Examples of results are shown and some future developments are identified.