Underwater Acoustic methods have been extensively used to locate and identify marine objects. These applications include locating underwater vehicles, finding shipwrecks, imaging sediments and imaging bubble fields. Ocean is fairly transparent to sound and opaque to all other sources of radiation. Acoustics technology is the most effective tool for monitoring this environment because of the sou...

Marine buoy is an important part of underwater acoustic communication system. It is of great significance to track and locate it. It is widely used in ocean environment three-dimensional monitoring, underwater multimedia communication, underwater mobile carrier navigation and positioning, marine resources detection, remote control of submarine topography mapping and offshore oil industry, data ...

Microsensors are powerful tools for microenvironment studies, however their use has often been restricted to laboratory applications due to the lack of adequate equipment for in situ deployments. Here we report on new features, construction details, and examples of applications of an improved diver-operated motorized microsensor profiler for underwater field operation to a water depth of 25 m. ...

In situ acoustic calibration devices are necessary to assure the optimal performance of sensors and detectors for the acoustic detection of ultra-high energy neutrinos in underwater telescopes. Moreover, they provide evidences for the feasibility evaluation of the technique and for the determination of the entire detector efficiency. Following previous studies related to parametric acoustic sou...

in this paper, for the purpose of investigating horizontal sound propagation, based on the results obtained from practical measurements in the strait of hormoz and available data on sound speed variations at different depths, a comprehensive model for shallow water multipath underwater acoustic channel is presented. mathematical modeling of multipath effect is based on ray theory and the image ...

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

Underwater sensor networks (UWSN) resemble terrestrial sensor networks in many aspects. However, the high propagation delay and limited bandwidth make terrestrial sensor network’s protocols unsuitable for UWSN. Underwater sensor node are powered by batteries which are even difficult to recharge. So, energy efficiency is major concern for underwater routing. In this paper ,based on VBF, we provi...

This paper discusses the use of distributed autonomous underwater vehicles (AUVs) for multistatic processing and tracking of underwater target. A localized processing chain is implemented on each AUV to generate the contact report of an underwater target that is transmitted to a command center via underwater acoustic communications (UWA). The contact reports from several AUVs are combined toget...

[Purpose] This study's working hypothesis is that underwater walking training is beneficial for healthy subjects balance. [Subjects and Methods] Forty eight subjects (Underwater walking group=25, Overground walking group=23) completed the experiment. Healthy subjects with no orthopedic history of lower extremity injuries were recruited. Gait training is performed using the underwater treadmill ...

Underwater sensor network consists of number of various sensors and autonomous underwater vehicles deployed underwater to coordinate, interact and share information among them to carry out sensing and monitoring functions. Underwater environment differs from terrestrial radio environment both in terms of energy costs and channel propagation phenomena. The goal of the project is to reduce the oc...