This paper reports the formulation and evaluation of a centralized extended Kalman filter designed for a novel navigation system for underwater vehicles. The navigation system employs Doppler sonar, depth sensors, synchronous clocks, and acoustic modems to achieve simultaneous acoustic communication and navigation. The use of a single moving reference beacon eliminates the requirement for the u...

Bio-inspired vehicles are currently leading the way in the quest to produce a vehicle capable of flight and underwater navigation. However, a fully functional vehicle has not yet been realized. We present the first fully functional vehicle platform operating in air and underwater with seamless transition between both mediums. These unique capabilities combined with the hovering, high maneuverab...

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...

In the last decades, robots have been used to explore areas hard to reach for humans. Underwater environments fall into this category, since their operating conditions make even simpler operations risky to be carried out by divers, especially when they have to be performed at high depth. A possible approach to overcome this problem is to use a Remotely Operated Vehicle (ROV), although this easi...

Underwater gliders are type of autonomous underwater vehicle that glide by controlling their buoyancy and attitude using internal actuators. By changing the vehicle’s buoyancy intermittently, vertical motion can be achieved. Characteristic of glider motions include upward and downward in a saw tooth pattern, turning and gliding in a vertical spiral motion glides without using thrusters or prope...

This paper describes a virtual collaborative world simulator, DVECS (Distributed Virtual Environment Collaborative Simulator), for underwater robots and its underwater vehicle, SAUVIM (Semi-Autonomous Underwater Vehicle for Intervention Missions). DVECS is used for testing unmanned underwater vehicles (UUVs) of both real and simulated worlds where interaction and cooperation of other real and s...

In the paper a fuzzy control system to steering of unmanned underwater vehicle is considered. Underwater objects, which operate beneath surface of water, very often are exposed to disturbances of its movement from a sea current. In case of lack of sea current measurement devices on the board they can not counteract it by generating contrary thrust. A method of evaluation of influence of environ...