in this study, the roll, yaw and depth fuzzy control of an au- tonomous underwater vehicle (auv) are addressed. yaw and roll angles are regulated only using their errors and rates, but due to the complexity of depth dynamic channel, additional pitch rate quantity is used to improve the depth loop performance. the discussed auv has four aps at the rear of the vehicle as actuators. two rule bases...

The paper addresses the problem of autonomous underwater vehicle (AUV) modeling and parameter estimation as a means to predict the expected dynamic performance of underwater vehicles and thus provide solid guidelines during the design phase. The use of analytical and semi-empirical (ASE) methods to predict the hydrodynamic derivatives of the most popular class of AUVs is discussed. An applicati...

This paper reports on an exact, real-time solution for server-client cooperative localization over a faulty and extremely bandwidth-limited underwater communication channel. Our algorithm, termed the origin state method, enables a ‘server’ vehicle to broadcast its navigation information to multiple ‘client’ vehicles over a bandwidthlimited and faulty communication channel. The server’s broadcas...

In this paper, the problem of underwater scene understanding from multisensory data is addressed. Acoustic and optical devices onboard an underwater vehicle are used to sense the environment in order to produce an output which is readily understandable even by an inexperienced operator. The main idea is to integrate multiple sensory data by geometrically registering data to a model. In this way...

This paper presents the design and experimental implementation of an L1 adaptive control on a tethered underwater vehicle. This controller, well known for its fast adaptation and its robusntess, is proposed to be applied for the first time in the field of underwater vehicles control. This paper summarizes the implementation and experimental results obtained on a modified version of the AC-ROV u...

This paper describes the unmanned underwater remotely operated vehicle (UROV) THETIS, an easy to operate vehicle suitable for exploiting water environments. The subsystems composing our system, as compared to conventional ROVs, are discussed and evaluated. The vehicle’s primary use, at the present stage of development, is to perform underwater observations as well as temperature, pH/dissolved O...

In this paper, the problem of underwater scene understanding from multisensory data is addressed. Acoustic and optical devices onboard an underwater vehicle are used to sense the environment in order to produce an output which is readily understandable even by an inexperienced operator. The main idea is to integrate multiple sensory data by geometrically registering data to a model. In this way...

Autonomous Underwater Vehicles (AUV) speed and position control systems are subjected to an increased focus with respect to performance and safety due to their increased number of commercial and military application as well as research challenges in past decades, including underwater resources exploration, oceanographic mapping, undersea wreckage salvage, cable laying, geographical survey, coas...

This paper presents a reactive/local level of an Obstacle Avoidance System for an Autonomous Underwater Vehicle (AUV). The specific requirements of the underwater world, the computational capacity and the sensors of the vehicle as well as its manoeuvrability were considered by the choice and the development of strategies used. Such requirements include the sea current information, the considera...

The paper presents algorithm of underwater vehicle’s dynamics modeling using technique of artificial neural networks. Paper includes mathematical description of used dynamical neurons and basis of its learning process. Next the results of research for real underwater vehicle were presented. Key-Words: artificial neural networks, dynamics modeling, underwater vehicles