2 edition of preliminary study of shallow-water sonar issues found in the catalog.
preliminary study of shallow-water sonar issues
W. Kenneth Stewart
by Woods Hole Oceanographic Institution, Massachusetts Institute of Technology in [Woods Hole, Mass
Written in English
This preliminary investigation addresses key program elements for sonar sensing in a shallow-water environment to establish bounds on possible solutions and to reduce program uncertainty. The modeling and experimental program focuses on two issues - the potential degradation of sonar data due to signal masking by shallow-water reverberation and signal loss caused by extreme platform motions. The research program combines theoretical analysis, experimental validation in a shallow-water environment, and development of a computer model to explore parametric sensitivity. Results from an initial dock-side test show good agreement with the theoretical predictions. From the shallow-water experiments and acoustic modeling we conclude that: (1) Signal motion loss can influence the reverberation level significantly but is not the dominant factor in target detection for sonars in the frequency range of interest (>200 kHz); a high-quality (velocity-aided) inertial navigation and attitude system will be sufficient to correct for geometric distortions caused by platform motion. (2) Although surface reverberation and multipath noise can be a factor, partcularly in shadow-mode imaging, reverberation levels are rapidly attenuated at the frequencies of interest and beam patterns can be manipulated to reject most interferences; echo-mode imaging is still dominated by the contrast between target strength and bottom reverberation.
|Statement||by W. Kenneth Stewart, Dezhang Chu, and Xiaoou Tang.|
|Series||WHOI -- 93-41., WHOI (Series) -- 93-41.|
|Contributions||Chu, Dezhang., Tang, Xiaoou., Woods Hole Oceanographic Institution.|
|The Physical Object|
|Pagination||51 leaves :|
|Number of Pages||51|
SONAR, an acronym for Sound Navigation and Ranging, is a technique based on echolocation used for the detection of objects underwater. Historical development of SONAR. Ancient drawings depict the use of long tubes as non-mechanical underwater listening devices to detect and transmit sound in water. The invention of sonar changed the way that the seafloor is mapped. A combined transmitter and receiver, called a transducer, sends a sound pulse straight down into the water. The pulse moves down through the water and bounces off the ocean bottom. The transducer is able to pick up the reflected sound. Computers precisely measure the time it takes for the sound pulse to reach the bottom and.
The Sonar of Dolphins is the first book to summarize modern research on this subject, and presents a broad synthesis of this very interdisciplinary subject. The author is an internationally-recognized expert on dolphin sonar and is in a unique position to bring together research on the physiological, mathematical and engineering aspects of. How is sound used to study the Earth’s history? How is sound used to explore for oil and gas? How is sound used to measure, detect, and track oil? How is sound used to study undersea earthquakes? How is sound used to study underwater volcanoes? How is sound used to map the seafloor? How is sound used to research wind energy? Investigate.
These data then can be used to describe the influences of hurricanes, large storm events, and anthropogenic activity on the distribution and type of bedforms, sediment composition, and the acoustic character of shallow water sediments. We collected sonar images of the seafloor both in cross section and in map view, recovered surface sediments. Cato, D.H. b. Features of ambient noise in shallow water. Proceedings of International Conference on Shallow-Water Acoustics (SWAC’97), pp. Cato, D. The biological contribution to the ambient noise in waters near Australia. Acoustics Australia Cato, D.H. Doug Cato Notes.
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This preliminary investigation addresses key program elements for sonar sensing in a shallow-water environment to establish bounds on possible solutions and to reduce program uncertainty. The modeling and experimental program focuses on two issues - the potential degradation of sonar data due to signal masking by shallow-water reverberation and signal loss caused by extreme platform motions.
A Preliminary study of shallow-water sonar issues: signal motion loss and reverberation noise. A Preliminary Study of Shallow-Water Sonar Issues: Signal Motion Loss and Reverberation Noise by W.
Kenneth Stewart, Dezhang Chu, and Xiaoou Tang Woods Hole Oceanographic Institution Woods Hole, Massachusetts September Technical Report Funding was provided by the Mitre Corporation and the Office of Naval Research. First a field is considered a shallow-water subsea development if the water depth at the location is less than m ( ft).
In practice, shallow water is the water depth within a diver's reach. Second a field is considered a deepwater subsea development if the water depth ranges between and m. A preliminary study of shallow-water sonar issues: Signal motion loss and reverberation noise.
Woods Hole Oceanographie Institution, Woods Hole, MA, Tech. Rept. WHOI Cited by: 5. A preliminary study of shallow-water sonar issues: Signal motion loss and reverberation noise.
Woods Hole Oceanographic Institution, Woods Hole, MA, Tech. Rept. WHOI– Google Scholar. David R. Andrews, in Encyclopedia of Physical Science and Technology (Third Edition), IX.A Marine Sonar.
Marine sonar can be used for warfare, sea bottom sounding, mapping the sea bottom and locating shoals of fish. Complications arise when working in deep oceans because the water temperature changes with depth, causing ultrasonic waves to be reflected.
A report on methodologies used for the study of a deep-water site. T Gambin, P Drap, B Cheminsky, K Hyttinen and G Kozak. Abstract: A shipwreck was discovered in deep-water during a systematic side-scan sonar survey conducted in by Malta’s heritage authorities and the University of Malta.
Located off the coast of the island of Gozo. Six years ago, a group of marine scientists, acousticians (experts in sound), and U.S. government and Navy personnel met to discuss how one of these noisy activities—military sonar—affects marine mammals.
It was clear that in some places, sonar had caused groups of animals to strand on the beach. Lafferty, R. Quinn, C. Breen, A side-scan sonar and high-resolution Chirp sub-bottom profile study of the natural and anthropogenic sedimentary record of Lower Lough Erne, northwestern Ireland, Journal of Archaeological Science, /, 33, 6, (), ().
Mine counter measures (MCM) sonars have seen accelerated development over the last few years as Navy interests have shifted into shallow‐water operations. To find mines, most MCM sonar technologies use relatively high‐frequency and narrow‐band signals to produce high‐resolution images of the seafloor.
Even so, the problem of discriminating between proud mines and similarly sized false. Del Balzo, J. Leclerce, M. Collins, Critical angle and seabed scattering issues for active-sonar performance predictions in shallow water, in High frequency acoustics in shallow water.
This book and the attached full-color CD are the proceedings of a conference organ ised by the SACLANT Undersea Research Centre, held at Villa Marigola, Lerici, Italy, on September The fundamental problems associated with environmental 1 variability and sonar were explored at a previous SACLANTCEN conference in generation, (2) study the implications of focusing by surface gravity waves on Doppler sonar and acoustic communications systems in shallow and very shallow water, and (3) study the performance of acoustic vector sensors in very shallow water.
OBJECTIVES. The objectives of the research are to address the questions in the areas identified below. CMOS Arctic Special Interest Group presentation-Background and History ().
Best Practice: Long-term Oceanographic Mooring Measurements in Arctic Regions (ECO Magazine March/April ). Sea Ice Research: Recent Findings and Outstanding Issues in Relation to Arctic Development ().
Sea-ice thickness in the coastal northeastern Chukchi Sea from moored ice-profiling sonar Journal of. Ainslie, M.A., Principles of Sonar Performance Modeling, Springer (). A modern treatment of both man-made and bio-sonar. Includes derivations of the active and passive sonar equations from physical principles.
Au, W.W.L., The Sonar of Dolphins, Springer (). The first ever book describing the hearing and echo location of dolphins. Another thing that’s worth mentioning is the myth that side-shooting SONAR doesn’t work very well in shallow water, at least it’s a myth with my Raymarine units.
They can be adjusted so that I can see every stump and rock that’s alongside my boat. Frankly, I didn’t know about that until just. Re: SONAR for Shallow Water Post by jimh» Fri pm I don't know what the water clarity is where you are operating your boat, but in the Great Lakes, where I am boating, you do not need a depth sounder to let you know you are in water that is less than feet deep.
Examination of Time-Reversal Acoustic Applications to Shallow Water Active Sonar Systems Spiral-bound – January 1, by Thomas A. Winter (Author)Author: Thomas A. Winter. The scope of this research is to develop a shallow water sonar system designed to detect and map the location of objects such as hazardous wastes or discarded ordnance in coastal waters.
The system will use high frequency wide-bandwidth imaging sonar, mounted on a moving platform towed behind a boat, to detect and identify objects on the sea bottom. SURVEY DESIGN ANALYSIS FOR THREE-DIMENSIONAL MAPPING OF BEACH AND NEARSHORE MORPHOLOGY David J.
Bernstein1, Chris Freeman2, Michael F. Forte3, Jun-Yong Park4, Paul T. Gayes5, Helena Mitasova6 Abstract: Accurate documentation of beach and nearshore morphology is an essential component of coastal research and management.The impact of sonar technologies has been growing, particularly at the beginning of autonomous vehicles era.
Recently, the influence of artificial intelligence for radar and sonar image processing and understanding has emerged. Radar and sonar systems are mounted onboard of smart and flexible platforms and also on several types of unmanned.
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