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Developing a new sonar for side-scan imaging can be a complicated and expensive proposition. Sonar models and simulations can be used to alleviate some of the expense and time required for development by providing some early simulated imagery of proposed designs. This paper describes a modeling approach where inverse imaging techniques are applied in order to generate simulated stave-level sonar data...
Unmanned or manned underwater vehicles are often designed in cylindrical shapes which have desirable properties for withstanding the pressures that can be experienced in undersea environments. However, cylindrical designs are not required for non-pressurized enclosures. Non-cylindrical designs may provide benefits to developers including allowing a wider variety of materials for construction, greater...
Underwater imaging has become a staple tool used by scientists exploring the deep ocean. Advanced camera systems are able to combine quantitative measurements from in-situ sensors with qualitative imaging to provide high fidelity multi-dimensional datasets which can be used to support a wide range of science questions. This includes benthic characterization and mapping, identification of biota and...
This paper presents an optimal waveform design method using Multi-Tone Sinusoidal Frequency Modulation (MTSFM). The MTSFM waveform's modulation function is represented using a Fourier series expansion. This representation results in a constant amplitude waveform with a continuous modulation function whose spectrum, Auto-Correlation Function, and Ambiguity Function shapes can be modified by adapting...
The knowledge of water temperature profiles of the upper-ocean mixed layer provides valuable input to climate studies, weather forecasts and oceanography in general. A remote-sensing lidar is an attractive method for real-time measurements of these data. The principle idea of our approach is a lidar using the time-of-flight information to measure the depth and relying on spontaneous Brillouin scattering...
This paper focus on the use of unmanned aerial vehicle teams for performing cooperative perception using Data Distribution Service (DDS) Network. We develop a DDS framework to manage the incoming and out bounding network traffic of multiple types of data that is exchanged inside the UAV network. Experimental results both in laboratory and in actual flight are presented to help characterize the proposed...
How can teams of artificial agents localize and position themselves in GPS-denied environments? How can each agent determine its position from pairwise ranges, own velocity, and limited interaction with neighbors? This paper addresses this problem from an optimization point of view: we directly optimize the nonconvex maximum-likelihood estimator in the presence of range measurements contaminated with...
The Ocean Observatories Initiative (OOI) consists of seven research sites collecting ocean, seafloor, and meteorological data in the world's oceans, extending from the Irminger Sea to the Southern Ocean, and the East and West coasts of the United States. The Ocean Observatories Data Evaluation Team is part of the Cyberinfrastructure group at Rutgers University, tasked with reviewing the oceanographic...
Processing large data sets on a cloud-based platform greatly reduces the costs normally associated with the required computing infrastructure due to its on-demand availability and scalability. Cloud-based computing can therefore be leveraged to speed operational delivery of large data sets to research scientists and decision-makers in an emergency response, specifically during a marine oil spill response...
Design of a laboratory scale wave energy converter (WEC) system based on planar double-sided permanent magnet linear generator (PMLG) is considered in this paper. The detail procedure in designing the PMLG is reported including analytical work and experimental testing. The main objective is to create a simple and easy procedure in the design and optimize the detailed parameters to achieve the aimed...
Many different sensors have been installed on board vessels, a new framework is urgently needed to form a Common Operational Picture (COP), to assist the on-board operations and onshore analysis. In this paper, based on the Visual Analytics framework, we present a spatiotemporal dimension reduction method based on a real world case of oil combat operation. With our prototype, we show that how dimension...
Fishing has the highest rate of occupational fatalities in the USA, per the Bureau of Labor Statistics, and Alaska's waters are the deadliest, per Coast Guard statistics [1]. Many fishing fatalities stem from small boats, 44 feet in length or less. Small boats can sink or tip for many reasons including bad weather, rough seas, mechanical problems and poor maintenance. Some operators will cut corners...
Generally, underwater hull inspection have been conducted by human divers. It is an extremely dangerous task, and hence, can be a potential application for unmanned underwater vehicles. The operational safety and performance of in-water inspection can be significantly improved by introducing unmanned vehicle systems. This study addresses the development of an hover-capable autonomous underwater vehicle...
In this paper, we propose a method for cooperative surveys of the seafloor using multiple autonomous underwater vehicles (AUVs) where they detect areas of interest within the survey area in real-time based on a bathymetry map and then details are observed by them. The AUV firstly makes rough observations by mapping using an acoustic sensor and detects areas of interest based on a gradient descent...
Seabed minerals in form of ferromanganese or polymetallic nodules (PMN) have been reported in the Pacific, Atlantic, and Indian oceans. The distribution of these PMN are influenced by several factors, such as the associated topographic undulations, surface chlorophyll levels, sediment type and thickness, and water depth. Traditionally, determination of the existence and the distribution of PMN involves...
Through and comprehensive tests are necessary to ensure complete stability and reliability of AUV, due to the high risk and consumption of in field testing, onshore testing technology for AUV is proposed. Rudder load simulator plays an important role in the onshore testing of AUV. In this paper, the design and development of a rudder load simulator was discussed. Rudder load calculation method during...
An efficient method was developed to compute the pressure field induced on the seafloor by a ship performing maneuvers such as acceleration, deceleration, and turning. Linear, potential flow theory with transient, finite-depth Green function is used to formulate the solution for the velocity potential. To reduce run time, thin-ship approximation is made, and the Green function is evaluated using Chebyshev...
The West Antarctic Peninsula (WAP) is associated with large phytoplankton blooms that are dominated by large (<20 microns) diatoms however, nanoplankton (>20 microns) are also an important component in the phytoplankton community. The dominant nanoflagellate in the WAP has been suggested to be cryptomonad algae. Using a twenty-year time series collected by the Palmer Long Term Ecological Research...
This paper proposes a novel framework for detecting and localizing the transients corresponding to the shocks created by sediment impacts on a steel plate. Based on unsupervised hierarchical agglomeration of complex vibration spectra, the derived classification is available for bedload transport monitoring stations in underwater environement.
This paper proposes using the sparse-recovery (SR) based 2-D multiple-signal classification (MUSIC) to enhance the multi-target detection capability of high-frequency surface wave radars (HFSWRs). Usually, for wide-beam HFSWRs, target detection is first conducted in the range-Doppler spectrum; bearings are then estimated by super-resolution methods, such as MUSIC. Unfortunately, this approach can...
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