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Measuring, observing and forecasting our oceans, coastal waters and Great Lakes is a crucial endeavor, supporting a wide range of safety, economic and environmental benefits. The ‘Ocean Enterprise’ - business activity that underpins making ocean measurements, observations and forecasts, and their subsequent use to deliver economic and societal benefits - is an important industry cluster, and one in...
Sometimes referred to as the ‘Serengeti of the Sea’, the one-of-a-kind Monterey Bay of California is now embracing a new name, the ‘Blue Silicon Valley’ which aptly describes the world's leading sustainable, marine science research and development region. The Monterey Bay, one of the largest marine sanctuaries in the United States, is located just 30 miles southwest Of Silicon Valley and is now primed...
Vertical oscillations experienced by a conductivity, temperature, and depth (CTD) profiling instrument descending in the water column appear as loops in the profile of descent rate vs. pressure. This paper describes methods to remove nested loops that are prevalent in CTD profiles taken in less than 100 m of water depth from a coastal oceanographic vessel with no heave compensation mechanism and no...
A paper was presented at OCEANS'12 by the authors on a similar topic. The original paper was more of a formulation of ideas for automated quality control of HF radar data with only a listing of potential tests. This paper lays out the framework for the quality assurance methods and quality control tests for the entire data processing chain. The paper also synthesizes a number of papers that have been...
A new type of underwater glider is under development as part of the nationally funded project ROBEX. The glider is shaped as a blended wing body that show promise to provide larger payload capacity while enhancing the range. Similar development activities in the US substantiate this assumption and therefore the authors feel encourage preparing the system for first field deployments. After getting...
At the end of 2012, the ITU issued Resolution 612, which allotted designated secondary radio spectral slots to coastal oceanographic radars (3 – 50 MHz). Part of the condition for authorized use of these bands is the requirement that each radar transmit a Morse-coded call sign issued by its national authority. The unique call sign identifies the transmitter. The worldwide process of implementing this...
This paper explored the opportunities for using unmanned surface vehicles for anti-submarine warfare. Areas of the problem where such vehicles are likely to contribute value are discussed, along with an approach for developing and utilizing such vehicles.
In this research, the automatically analyzation method which detect acoustic events such as fin whale calls and its locations is embedded in cable observatory system. This system has detection method about fin whale calls using spectrogram correlation, and the localization of fin whale calls using two hydrophones and a three-axis seismometer. This observation at off Kushiro-Tokachi has been continuously...
Having inspiring evidence of the wonders present in the deep sea is the best way to get the general public more aware of and interested in ocean exploration. Advances in consumer grade virtual reality headsets like Google Cardboard allow for immersive experiences and a unique way to engage the public in ocean exploration. It is in this context that the Medusa 360 camera was invented. During the spring...
A new technology developed by the US Geological Survey now allows for fast, direct detection of hydrocarbon plumes both in rivers and drifting in the deep ocean. Recent experiments show that the method can also detect and quantify hydrocarbons buried in river sediments and estuaries. This approach uses a variant of induced polarization, a surface-sensitive physical property of certain polarizable...
In this paper an optimization process to obtain the optimal code rate, SNR and modulation order for energy efficient underwater communications is presented. It was seen that it is possible to further decrease the consumption when compared to the binary case considering code rate optimization in conjunction with the selection of the optimum modulation order, while achieving higher data transmission...
We present an underwater docking technique for a manta-type unmanned undersea vehicle (UUV) which is under development in Korea Institute of Robot and Convergence (KIRO). The manta-type UUV is a test-bed vehicle for demonstrating an autonomous docking technique in the water tank [1]. There are two cameras mounted in front of the vehicle for vision-based underwater localization around docking station...
We describe the development and in situ testing results of an underwater atomic force microscope (UAFM) system. The UAFM system is compact, mobile, and mountable on underwater vehicles or submersible seafloor platforms, and intended for in situ observation of microorganisms and microparticulates with a nanometer-scale spatial resolution, especially near deep-sea hydrothermal features. First, we tested...
A low sidelobe level time-domain adaptive broadband beamforming is proposed in this paper by adding a sparse constraint on the output beam pattern. Then, the robustness against direction of arrival (DOA) mismatch can be achieved. The proposed method is a convex optimization problem, which can be solved by convex optimization software efficiently. Simulation and experimental results show the properties...
This work demonstrates the propagation and dynamic manipulation of composite vortex beams through an underwater turbid environment. These profiles are generated through the coherent superposition of several different optical orbital-angular momentum modes using a 543.5 nm HeNe laser with a coherence length of 58.5 mm. The spatial coherence is maintained after propagation through 0.508 m of water with...
The challenge of rapidly and accurately assessing the potential acoustic scattering from bathymetric features requires a physics based solution to the rough surface scattering problem that captures the essential behavior of the scattering while still retaining a level of simplicity that allows for fast computation. A very common and simple geometric proxy (derived from the Kirchhoff approximation)...
Advances in semiconductor technologies have enabled a new generation of small, accurate, low power sensors. The capabilities of these sensors, combined with similar advances in microprocessing capabilities, have enabled the integration of sensors and on-board processing algorithms that bring a wealth of possibilities. This paper will explore the use of one such sensor-microprocessor combination and...
JAMSTEC has been developed underwater vehicles and observation equipments required for a variety of study about oceanography. Among the many research fields about deep-sea, in Japan there has been a growing interest in seabed resources from a few years ago. Then we had developed an AUV “Yumeiruka” to perform seabed resource survey. As one of the most significant feature of the shape of “Yumeiruka”,...
In this paper, we propose a method of AUV localization and mapping using visual measurement of underwater structures. Since the inertial navigation system (INS) of AUV suffers from drift, visual observation of fixed objects can enhance the localization performance. In a framework of pose graph optimization, depth map estimation of underwater structures and tracing of AUV trajectory are concurrently...
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