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This thesis evaluates the concept of a "Towed-ROV", and is provided by NTNU Ålesund. The purpose of this project is to design and develop a remote operated vehicle, to be towed behind a vessel. It functions as amulti-purpose platformwith the capabilities of performing exploration, searches and surveys. Creating such an ROV simplifies these tasks by providing real-time video and sensor data, removing the need of recharging batteries and the continuous attention from an operator. To achieve this, it was developed a design, autonomous depth controller, graphical user interface, server application and option to easily add external equipment on the ROV. A prototype was created to prove this concept. Tests performed revealed acceptable performance from the prototype, using affordable materials. These results validate the concept of a towed ROV as a suitable solution for the designated area of application.