Category Archives: Acoustics & Sonar

Underwater Acoustics for Biologists and Conservation Managers

Blue Whale was Tracked for Forty Three Days in North Atlantic Ocean

Video Clip: Click to Watch
A COMPREHENSIVE TUTORIAL DESIGNED

 

FOR ENVIRONMENTAL PROFESSIONALS

Different species of whales and dolphins produce different sounds, such as songs, moans, clicks, roars, sighs, and many other characteristic noises. Each species is unique in its vocalizations. Scientists can listen for these sounds and track the different marine mammal species, and sometimes even individual animals, while they are producing sound.

This four-day course from the Applied Technology Institute (ATI) is designed for biologists, and conservation managers, who wish to enhance their understanding of the underlying principles of underwater and engineering acoustics needed to evaluate the impact of anthropogenic noise on marine life.

This course provides a framework for making objective assessments of the impact of various types of sound sources. Critical topics are introduced through clear and readily understandable heuristic models and graphics. After taking this course you will have the knowledge to perform basic assessments of the impact of anthropogenic sources on marine life in specific ocean environments, and to understand the uncertainties in your assessments.

UNDERWATER ACOUSTICS FOR BIOLOGISTS AND CONSERVATION MANAGERS: A COMPREHENSIVE TUTORIAL DESIGNED FOR ENVIRONMENTAL PROFESSIONALS

What You Will Learn:

What are the key characteristics of man-made sound sources and usage of correct metrics?

How to evaluate the resultant sound field from impulsive, coherent and continuous sources.

How are system characteristics measured and calibrated?

What animal characteristics are important for assessing both impact and requirements for monitoring/and mitigation?

Capabilities of passive and active monitoring and mitigation systems.

Course Outline:

• The Language of Physics and the Study of Motion This quick review of physics basics is designed to introduce acoustics to the neophyte.

• What Is Sound and How To Measure Its Level The properties of sound are described, including the challenging task of properly measuring and reporting its level.

• Digital Representation of Sound Today, almost all sound is recorded and analyzed digitally. This section focuses on the process by which analog sound is digitized, stored and analyzed.

• Spectral Analysis: A Qualitative Introduction The fundamental process for analyzing sound is spectral analysis. This section will introduce spectral analysis and illustrate its application in creating frequency spectra and spectrograms.

• Basics of Underwater Propagation and Use of Acoustic Propagation Models The fundamental principles of geometric spreading, refraction, boundary effects and absorption will be introduced and illustrated using propagation models.

• Review of the Ocean Anthropogenic Noise Issue Current state of knowledge and key references summarizing scientific findings to date.

• Basic Characteristics of Anthropogenic Sound Sources Impulsive (airguns, pile drivers, explosives), Coherent (sonars, acoustic modems, depth sounder. profilers), Continuous (shipping, offshore industrial activities).

• Marine Wildlife of Interest & Their Characteristics Marine mammals, turtles, fish and invertebrates, Bioacoustics, hearing threshold, vocalization behavior. Supporting databases on seasonal density, distribution & movement.

• Assessment of the Impact of Anthropogenic Sound Source-transmission-receiver approach. Level of sound as received by the wildlife, injury, behavioral response, TTS, PTS, Masking. Modeling Techniques, Field Measurements Assessment Methods.

• Monitoring and Mitigation Techniques Passive Devices (fixed and towed systems), Active Devices, Matching Device Capabilities to Environmental Requirements (examples of passive and active localization, long term monitoring, fish exposure testing).

• Overview of Current Research Efforts

Click here for a slide sampler of this course

Your Instructors for this Course:

Dr. Adam S. Frankel is a senior scientist with Marine Acoustics, Inc., Arlington, VA and vice-president of the Hawai’i Marine Mammal Consortium. For the past 25 years, his primary research has focused on the role of natural sounds in marine mammals and the effects of anthropogenic sounds on the marine environment, especially the impact on marine mammals. A graduate of the College of William and Mary, Dr. Frankel received his M.S. and Ph.D. degrees from the University of Hawai’i at Manoa, where he studied and recorded the sounds of humpback whales. Post-doctoral work was with Cornell University’s Bioacoustics Research Program. Published research includes a recent paper on melon-headed whale vocalizations. Both scientist and educator, Frankel combines his Hawai’i – based research and acoustics expertise with teaching for Cornell University and other schools. He has advised numerous graduate students, all of whom make him proud. Frankel is a member of both the Society for the Biology of Marine Mammals and the Acoustical Society of America.

Dr. William T. Ellison is president of Marine Acoustics, Inc., Middletown, RI. Dr. Ellison has over 45 years of field and laboratory experience in underwater acoustics spanning sonar design, ASW tactics, software models and biological field studies. He is a graduate of the Naval Academy and holds the degrees of MSME and Ph.D. from MIT. He has published numerous papers in the field of acoustics and is a co-author of the 2007 monograph Marine Mammal Noise Exposure Criteria: Initial Scientific Recommendations, as well as a member of the ASA Technical Working Group on the impact of noise on Fish and Turtles. He is a Fellow of the Acoustical Society of America and a Fellow of the Explorers Club.

About ATI and the Instructors

Since 1984, ATI has provided leading-edge public courses and onsite technical training. Whether you are a busy engineer, a technical expert or a project manager, you can enhance your understanding of complex systems in a short time. You will become aware of the basic vocabulary essential to interact meaningfully with your colleagues.

Our mission here at ATI is to provide expert training and the highest quality professional development in space, communications, defense, sonar, radar, and signal processing. We are not a one-size-fits-all educational facility. Our short classes include both introductory and advanced courses.

ATI’s instructors are world-class experts who are the best in the business. They are carefully selected for their ability to clearly explain advanced technology.

Times, Dates, and Locations

This course is currently scheduled for:

October 17-20, 2011 in Seattle, WA

For the times, dates and locations of all of our short courses, please access the links below.

Sincerely,

The ATI Courses Team

P.S. Call today for registration at 410-956-8805 or 888-501-2100 or access our website at www.ATIcourses.com. For general questions please email us at ATI@ATIcourses.com.


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Did You “Hear” About the Underwater Acoustical Courses at ATI?

Acoustic simulation in a simple ocean environment

Video Clip: Click to Watch
Maybe Being “Underwater” is a Good Thing?

 

Since 1984, the Applied Technology Institute (ATI) has provided leading-edge public courses and onsite technical training. Whether you are a busy engineer, a technical expert or a project manager, you can enhance your understanding of complex acoustical systems in a short time.

Why not take a short course? ATI short courses are less than a week long and are designed to help you keep your professional knowledge up-to-date. Our courses provide a practical overview of acoustical technologies which provide a strong foundation for understanding the issues that must be confronted in the use, design and development of such complex systems.

The three courses below present the fundamentals of underwater acoustic analysis and modeling, which deals with the translation of our physical understanding of sound in the sea into mathematical formulas solvable by computers. The courses provide a comprehensive treatment of all types of underwater acoustic models including environmental, propagation, noise, reverberation and sonar performance models.

ATI’S UNDERWATER ACOUSTIC SYSTEM ANALYSIS COURSE

This four-day course is based upon the text Underwater Acoustic System Analysis by William Burdic. The course presents the fundamentals of underwater acoustics, acoustic signal generation and acoustic signal processing in sufficient depth to permit the analysis and optimization of the performance of underwater systems. The sonar systems include a variety of applications including active and passive detection of surface and sub-surface targets, acoustic communications, acoustic intercept and underwater depth sounders. The course will stress the required skills and techniques for system analysis and performance prediction.

Course Outline:

• Introduction to Sonar Analysis: Historical overview; important acoustical properties and characteristics; Acoustical Waves; Reflections and Refraction in the Ocean; Units and db.

• Sound Propagation In The Ocean: Sound Speed Variation in the ocean with variation in temperature, depth, salinity; Geographic Variation; Acoustic bottom and surface losses; absorption losses; Typical propagation modes; surface layer; shallow channels; deep channels; convergence zones; RAP; Typical Propagation Curves.

• Ambient Noise in the Ocean: Sources of noise; shipping; wind generated; thermal; others; Noise spectra; ambient noise angular distribution and correlation properties; use of the spatial correlation function in system calculations.

• Target Characteristics: Passive signature sources including propulsion, propeller, auxiliary machinery, flow-induced noise; effect of self-generated noise on sonar performance; Target strength for mono-static and bi-static sonars; Reverberation from volume, surface and bottom.

• Acoustic Transducers: Definitions, piezo-ceramic properties; Hydrophone configurations; equivalent circuits and sensitivity; Projector configurations, equivalent circuits, efficiency and operation.

• Beamforming-Spatial Filtering: Purpose and types of beamforming; spatial filters, multi-element arrays, array shading functions; beam steering; gain of arrays in distributed noise; angle estimation.

• Performance Analysis-Statistical Basis: Hypothesis testing and optimum detection processors for active and passive systems; ROC curves; Estimation of time delay, frequency and bearing.

• Performance Analysis: Practical examples; Examples illustrating the analysis of sonar systems; passive narrowband and broadband detection; passive angle tracking and ranging; High-power system detection for multipath reverberation and noise-limited conditions with Doppler Processing.

Your Instructors for this Course:

William Burdic received his BS and MS at Oregon State University. He served as an instructor in the Department of Electrical Engineering, Oregon State University when he joined Rockwell International. He has been engaged in the analysis and design of advanced radar and sonar systems. He is the author of two books “Radar Signal Analysis” and “Underwater Acoustic System Analysis”.

James W. Jenkins joined the Johns Hopkins University Applied Physics Laboratory in 1970 and has worked in ASW and sonar systems analysis. He has worked with system studies and at-sea testing with passive and active systems. He is currently a senior physicist investigating improved signal processing systems, APB, own-ship monitoring, and SSBN sonar. He has taught sonar and continuing education courses since 1977 and is the Director of the Applied Technology Institute (ATI).

ATI’S UNDERWATER ACOUSTICS 201 COURSE

This two-day course explains how to translate our physical understanding of sound in the sea into mathematical formulas solvable by computers. It provides a comprehensive treatment of all types of underwater acoustic models including environmental, propagation, noise, reverberation and sonar performance models.

Specific examples of each type of model are discussed to illustrate model formulations, assumptions and algorithm efficiency. Guidelines for selecting and using available propagation, noise and reverberation models are highlighted.

Demonstrations illustrate the proper execution and interpretation of PC-based sonar models. Each student will receive a copy of Underwater Acoustic Modeling and Simulation by Paul C. Etter, in addition to a complete set of lecture notes.

Your Instructor for this Course:

Paul C. Etter has worked in the fields of ocean-atmosphere physics and environmental acoustics for the past thirty-five years supporting federal and state agencies, academia and private industry. He received his BS degree in Physics and his MS degree in Oceanography at Texas A&M University. Mr. Etter served on active duty in the U.S. Navy as an Anti-Submarine Warfare (ASW) Officer aboard frigates. He is the author or co-author of more than 180 technical reports and professional papers addressing environmental measurement technology, underwater acoustics and physical oceanography. Mr. Etter is the author of the textbook Underwater Acoustic Modeling and Simulation (3rd edition).

Course Outline:

• Introduction. Nature of acoustical measurements and prediction. Modern developments in physical and mathematical modeling. Diagnostic versus prognostic applications. Latest developments in inverse-acoustic sensing of the oceans.

• The Ocean as an Acoustic Medium. Distribution of physical and chemical properties in the oceans. Sound-speed calculation, measurement and distribution. Surface and bottom boundary conditions. Effects of circulation patterns, fronts, eddies and fine-scale features on acoustics. Biological effects.

• Propagation. Basic concepts, boundary interactions, attenuation and absorption. Ducting phenomena including surface ducts, sound channels, convergence zones, shallow-water ducts and Arctic half-channels. Theoretical basis for propagation modeling. Frequency-domain wave equation formulations including ray theory, normal mode, multipath expansion, fast field (wavenumber integration) and parabolic approximation techniques. Model summary tables. Data support requirements. Specific examples.

• Noise. Noise sources and spectra. Depth dependence and directionality. Slope-conversion effects. Theoretical basis for noise modeling. Ambient noise and beam-noise statistics models. Pathological features arising from inappropriate assumptions. Model summary tables. Data support requirements. Specific examples.

• Reverberation. Volume and boundary scattering. Shallow-water and under-ice reverberation features. Theoretical basis for reverberation modeling. Cell scattering and point scattering techniques. Bistatic reverberation formulations and operational restrictions. Model summary tables. Data support requirements. Specific examples.

• Sonar Performance Models. Sonar equations. Monostatic and bistatic geometries. Model operating systems. Model summary tables. Data support requirements. Sources of oceanographic and acoustic data. Specific examples.

• Simulation. Review of simulation theory including advanced methodologies and infrastructure tools.

• Demonstrations. Guided demonstrations illustrate proper execution and interpretation of PC-based monostatic and bistatic sonar models.

ATI’S UNDERWATER ACOUSTIC MODELING AND SIMULATION COURSE

The subject of underwater acoustic modeling deals with the translation of our physical understanding of sound in the sea into mathematical formulas solvable by computers. This course provides a comprehensive treatment of all types of underwater acoustic models including environmental, propagation, noise, reverberation and sonar performance models.

Specific examples of each type of model are discussed to illustrate model formulations, assumptions and algorithm efficiency. Guidelines for selecting and using available propagation, noise and reverberation models are highlighted. Problem sessions allow students to exercise PC-based propagation and active sonar models.

Each student will receive a copy of Underwater Acoustic Modeling and Simulation by Paul C. Etter (a $250 value) in addition to a complete set of lecture notes.

View course sample for this course

Your Instructor for this Course:

Paul C. Etter has worked in the fields of ocean-atmosphere physics and environmental acoustics for the past thirty years supporting federal and state agencies, academia and private industry. He received his BS degree in Physics and his MS degree in Oceanography at Texas A&M University. Mr. Etter served on active duty in the U.S. Navy as an Anti-Submarine Warfare (ASW) Officer aboard frigates. He is the author or co-author of more than 140 technical reports and professional papers addressing environmental measurement technology, underwater acoustics and physical oceanography. Mr. Etter is the author of the textbook Underwater Acoustic Modeling and Simulation.

Course Outline:

• Introduction. Nature of acoustical measurements and prediction. Modern developments in physical and mathematical modeling. Diagnostic versus prognostic applications. Latest developments in acoustic sensing of the oceans.

• The Ocean as an Acoustic Medium. Distribution of physical and chemical properties in the oceans. Sound-speed calculation, measurement and distribution. Surface and bottom boundary conditions. Effects of circulation patterns, fronts, eddy and fine-scale features on acoustics. Biological effects.

• Propagation. Observations and Physical Models. Basic concepts, boundary interactions, attenuation and absorption. Shear-wave effects in the sea floor and ice cover. Ducting phenomena including surface ducts, sound channels, convergence zones, shallow-water ducts and Arctic half-channels. Spatial and temporal coherence. Mathematical Models. Theoretical basis for propagation modeling. Frequency-domain wave equation formulations including ray theory, normal mode, multipath expansion, fast field and parabolic approximation techniques. New developments in shallow-water and under-ice models. Domains of applicability. Model summary tables. Data support requirements. Specific examples (PE and RAYMODE). References. Demonstrations.

• Noise. Observations and Physical Models. Noise sources and spectra. Depth dependence and directionality. Slope-conversion effects. Mathematical Models. Theoretical basis for noise modeling. Ambient noise and beam-noise statistics models. Pathological features arising from inappropriate assumptions. Model summary tables. Data support requirements. Specific example (RANDI-III). References.

• Reverberation. Observations and Physical Models. Volume and boundary scattering. Shallow-water and under-ice reverberation features. Mathematical Models. Theoretical basis for reverberation modeling. Cell scattering and point scattering techniques. Bistatic reverberation formulations and operational restrictions. Data support requirements. Specific examples (REVMOD and Bistatic Acoustic Model). References.

• Sonar Performance Models. Sonar equations. Model operating systems. Model summary tables. Data support requirements. Sources of oceanographic and acoustic data. Specific examples (NISSM and Generic Sonar Model). References.

• Modeling and Simulation. Review of simulation theory including advanced methodologies and infrastructure tools. Overview of engineering, engagement, mission and theater level models. Discussion of applications in concept evaluation, training and resource allocation.

• Modern Applications in Shallow Water and Inverse Acoustic Sensing. Stochastic modeling, broadband and time-domain modeling techniques, matched field processing, acoustic tomography, coupled ocean-acoustic modeling, 3D modeling, and chaotic metrics.

• Model Evaluation. Guidelines for model evaluation and documentation. Analytical benchmark solutions. Theoretical and operational limitations. Verification, validation and accreditation. Examples.

• Demonstrations and Problem Sessions. Demonstration of PC-based propagation and active sonar models. Hands-on problem sessions and discussion of results.


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NASA launches Aquarius/SAC-D from Vandenberg Air Force Base on June 10, 2011

Aquarius will measure salinity by sensing thermal microwave emissions
from the water’s surface with three microwave instruments called
radiometers. When other environmental factors are equal, these
emissions indicate the saltiness of surface water. A microwave radar
scatterometer instrument will measure ocean waves that affect the
precision of the salinity measurement. Because salinity levels in the
open ocean vary by only about five parts per thousand, Aquarius will
be able to detect changes as small as approximately two parts per
10,000, equivalent to about one-eighth of a teaspoon of salt in a
gallon of water.


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How does the spring sounds under the Arctic seas?

Surprisingly loud and cacophonous believe it or not!  Although completely covered with ice on the surface with no signs of life these waters are filled with various animals.  Acoustic communication is key in a dark, ice-covered environment.  With the help of the hydrophone scientists are monitoring the sounds made by various aquatic life forms in the Arctic.

A hydrophone is a microphone designed to be used underwater for recording or listening to underwater sound. Most hydrophones are based on a piezoelectric transducer that generates electricity when subjected to a pressure change.

 

 

So, what do they hear?

  • Trills of the bearded seals
  • Moans and grunts of the bowhead whales
  • Whistles of the beluga whales

 

The reason for all this cacophony is that sounds propagates well in water and covers longer distances.

There is a lot of shipping noise in this area of the ocean, which causes some animals to gradually change the frequency of their calls.  They start calling at higher frequencies, to escape the shipping noise.

Read more here.

 

 


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Teledyne RD Instruments releases Velocity Software for ADCP

What is ADCP?

An Acoustic Doppler Current Profiler (ADCP or ADP) is a sonar that attempts to produce a record of water current velocities for a range of depths. They are made of ceramic materials, and contain transducers, an amplifier, a receiver, a mixer, an oscillator, a clock, a temperature sensor, a compass, a pitch and roll sensor, and computer components to save the information collected. ADCPs can be configured in many ways: side-listening, into rivers and canals for long term continuous discharge measurements, downward-listening and mounted on boats for instantaneous surveys in the ocean or rivers, and mounted on moorings, or the seabed for long term current & wavestudies. They can stay underwater for years at a time, and have a battery back for an energy source. The sonar is used for oceanography, estuary, river and stream flow measurement, and weather forecasting.

Who is Teledyne RD Instruments?

Teledyne Technologies Incorporated is a leading provider of sophisticated electronic components and subsystems, instrumentation and communications products, including defense electronics, monitoring and control instrumentation for marine, environmental and industrial applications, harsh environment interconnect products, data acquisition and communications equipment for air transport and business aircraft, and components and subsystems for wireless and satellite communications.

What is the big news?

The release of the new Sentinel V (platform for interacting with your ADCP) is complimented by the release of the new pre-deployment Velocity Software.  Velocity software is an all-purpose, real-time planning tool with an interface simple yet powerful interface.  The main features are:

  • Intricate 2D and 3D graphs including:
    • Time series graphs
    • Contour graphs
    • Profile graphs
    • 3D surface / contour / profile graphs
  • Basic/conventional processing features including averaging, coordinate transforms, and velocity reference
  • Comprehensive, advanced, and fully customizable data processing engine
  • A comprehensive log of all loaded and recent data files
  • Export to multiple output formats

Read more here.


 


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ATI Offers Advanced Courses Sonar and Submarine Engineering

Do you Need Active or Passive Sonar?
Do you Need Active or Passive Sonar?
Video Clip: Click to Watch
Advanced Topics in Underwater Acoustics and Warfare

From active versus passive sonar to nuclear versus diesel submarines; how are you keeping up with the latest advances in underwater acoustics and warfare?
These two four-day short courses summarize both basic and “leading-edge” topics. In each class, the basics principles are reviewed and then current achievements and challenges are addressed.

The aim of the instructors is to make available practical results and lessons-learned in a tutorial form suitable for a broad range of people working in underwater acoustics and warfare. The course is designed for sonar systems engineers, combat systems engineers and undersea warfare professionals who wish to enhance their understanding and become familiar with the “big picture”.

Why not take a short course from ATI?

Since 1984, the Applied Technology Institute (ATI) has provided leading-edge public courses and onsite technical training. ATI short courses are less than a week long and are designed to help you keep your professional knowledge up-to-date. Our courses provide a practical overview of space and defense technologies which provide a strong foundation for understanding the issues that must be confronted in the use, regulation and development of complex systems.

Whether you are a busy engineer, a technical expert or a project manager, you can enhance your understanding of complex systems in a short time. You will become aware of the basic vocabulary essential to interact meaningfully with your colleagues.

Course Outline, Samplers, and Notes

These two advanced courses provide an in-depth treatment, taught by experts in the field, of the latest results in a selection of core topics of underwater acoustics and warfare.

After attending either of these courses, you will receive a full set of detailed notes from the class for future reference, as well as a certificate of completion. Please visit our website for more valuable information.

ATI’S ADVANCED TOPICS IN UNDERWATER ACOUSTICS COURSE

Course Objectives:

• Provide a general understanding of ocean acoustics and sonar principles

• Make attendees conversant with all aspects of ocean acoustics and sonar technology, engineering and performance assessment in the context of naval applications.

• Provide detailed, critical knowledge for understanding of basic concepts in ocean acoustics, physics and modeling, transduction technology and engineering, processing for sonar signal detection and estimation, and sonar system design and performance assessment.

• Provide understanding of the design, development and use of the acoustic propagation modeling software.

• Provide information and perspectives on new and emerging sonar technology and techniques and new sonar system configurations and functions.

ATI’S ADVANCED UNDERSEA WARFARE COURSE

Advanced Undersea Warfare (USW) covers the latest information about submarine employment in future conflicts. The course is taught by a leading innovator in submarine tactics. The roles, capabilities and future developments of submarines in littoral warfare are emphasized.

The technology and tactics of modern nuclear and diesel submarines are discussed. The importance of stealth, mobility, and firepower for submarine missions are illustrated by historical and projected roles of submarines. Differences between nuclear and diesel submarines are reviewed. Submarine sensors (sonar, ELINT, visual) and weapons (torpedoes, missiles, mines, special forces) are presented.

Advanced USW gives you a wealth of practical knowledge about the latest issues and tactics in submarine warfare. The course provides the necessary background to understand the employment of submarines in the current world environment.

This short course is valuable to engineers and scientists who are working in R&D, or in testing of submarine systems. It provides the knowledge and perspective to understand advanced USW in shallow water and regional conflicts.

Determine for yourself the value of this course before you sign up.

Slide Sampler USW#1

Slide Sampler USW #2

About ATI and the Instructors

Our mission here at ATI is to provide expert training and the highest quality professional development in space, communications, defense, sonar, radar, and signal processing. We are not a one-size-fits-all educational facility. Our short classes include both introductory and advanced courses.

ATI’s instructors are world-class experts who are the best in the business. They are carefully selected for their ability to clearly explain advanced technology.

ATI’s Advanced Topics In Underwater Acoustics Course Instructors

Dr. Duncan Sheldon earned his PhD Degree in 1969. He has over twenty-five years’ experience in the field of active sonar signal processing. His experience includes real-time direction at sea of surface sonar assets during ‘free-play’ NATO ASW exercises. He was also a sonar supervisor during controlled and ‘free-play’ NATO ASW exercises.

Paul C. Etter has worked in the fields of ocean-atmosphere physics and environmental acoustics for the past thirty- five years supporting federal and state agencies, academia and private industry. He is the author or co-author of more than 180 technical reports and professional papers addressing environmental measurement technology, underwater acoustics and physical oceanography. Mr. Etter is the author of the textbook Underwater Acoustic Modeling and Simulation (3rd edition).

Dr. Harold “Bud” Vincent has served on active duty on fast attack and ballistic missile submarines, worked at the Naval Undersea Warfare Center, and conducted advanced R&D in the defense industry. Dr. Vincent received the M.S. and Ph.D. in Ocean Engineering (Underwater Acoustics) from the University of Rhode Island. His teaching and research encompasses underwater acoustic systems, communications, signal processing, ocean instrumentation, and navigation. He has been awarded four patents for undersea systems and algorithms.

Dr. John P. Ianniello received his Ph. D. Degree in Physical Oceanography from the University of Connecticut in 1977. He has been a member of the Underwater Acoustics Signal Processing Committee of the IEEE Signal Processing Society since 1980. He has received a number of awards including the American Society of Naval Engineers Solberg Award for Individual Research in 1998, and the Department of the Navy Meritorious Civilian Service Award in 2000. His recent research has specialized in the processing of array data from Autonomous Undersea Vehicles.

ATI’s Advanced Undersea Warfare Course Instructors

Capt. James Patton (USN ret.) is President of Submarine Tactics and Technology, Inc. and is considered a leading innovator of pro- and anti-submarine warfare and naval tactical doctrine. His 30 years of experience includes actively consulting on submarine weapons, advanced combat systems, and other stealth warfare-related issues to over 30 industrial and government entities.

Commodore Bhim Uppal former Director of Submarines for the Indian Navy and he is now a consultant with American Systems Corporation. He has direct experience onboard FOXTROT, KILO, and Type 1500 diesel electric submarines. He has over 25 years of experience in diesel submarines with the Indian Navy and can provide a unique insight into the thinking, strategies, and tactics of foreign submarines. He helped purchase and evaluate Type 1500 and KILO diesel submarines.

Times, Dates, and Locations

Either of these courses can be scheduled on-site at your facility. For the times, dates and locations of all of our short courses, please access our schedule.


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Humpback Whales- DJ’s of the seas?

Are Humpback Whales DJ’s of the seas?

ATI’s Underwater Acoustics For Biologist s and Conservation Managers course is scheduled to be presented on June 13-16, 2011 in Columbia, MD. We think the news below would be of interest to our readers and potential students.

New Australian study published in Current Biology on April 14, 2011 says “yes”. The 11 year long study was conducted in the South Pacific. As it turns out, humpback whales change their song overtime to stand out amongst other whales and appeal to female whales. There is something of a fashion trade in whale songs: one whale changes his song and soon enough all the other whales follow suit. This behavior has never been observed in any other non-human species on the planet.

Here are the highlights of the study:

· Humpback whale songs have repeatedly moved east across the South Pacific

· The songs moved across the region in a series of cultural waves

· The waves frequently caused complete “cultural revolution” of the song

· The scale, rate, and repetition of these cultural changes are unparalleled


The humpback whale (Megaptera novaeangliae) is a species of baleen whale. One of the larger rorqual species, adults range in length from 12–16 metres (39–52 ft) and weigh approximately 36,000 kilograms (79,000 lb). The humpback has a distinctive body shape, with unusually long pectoral fins and a knobbly head. It is an acrobatic animal, often breaching and slapping the water. Males produce a complex whale song, which lasts for 10 to 20 minutes and is repeated for hours at a time.

Read more here



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Is Traffic Noise Ruining Your Health?

World Health Organization (WHO) says “yes” in their latest report released in late March. According to the studies conducted in Europe traffic noise is the second biggest environmental problem affecting our health in Europe, after air pollution. Traffic noise level higher than 60dB cause 1.8% of heart attacks in the populations studied. It is imperative that the traffic noise should be reduced. Environmental Protection UK has recently launch a Campaign For Better Tires which encourages drivers to purchase better tires that are quieter. The European Commission is expected to release a proposal in June for more stringent vehicle noise standards, and from November 2012 new regulations for stricter tyre noise levels and tyre labeling for noise come into force.
Noise health effects are the health consequences of elevated sound levels. Elevated workplace or other noise can cause hearing impairment, hypertension, ischemic heart disease, annoyance and sleep disturbance. Changes in the immune system and birth defects have been attributed to noise exposure, but evidence is limited. Although some presbycusis may occur naturally with age, in many developed nations the cumulative impact of noise is sufficient to impair the hearing of a large fraction of the population over the course of a lifetime. Noise exposure has also been known to induce tinnitus, hypertension, vasoconstriction and other cardiovascular impacts. Beyond these effects, elevated noise levels can create stress, increase workplace accident rates, and stimulate aggression and other anti-social behaviors. The most significant causes are vehicle and aircraft noise, prolonged exposure to loud music, and industrial noise. Road traffic causes almost 80% of the noise annoyances in Norway.
The social costs of traffic noise in EU22 are over €40 billion per year, and passenger cars and lorries (trucks) are responsible for bulk of costs. Traffic noise alone is harming the health of almost every third person in the WHO European Region. One in five Europeans is regularly exposed to sound levels at night that could significantly damage health.
Noise is also a threat to marine and terrestrial ecosystems.

Read more here: http://aeinews.org/archives/1305?utm_source=feedburner&utm_medium=email&utm_campaign=Feed%3A+aeinews+%28aeinews.org%29


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Does Sonar Testing Causes Whales To Beach Themselves?

The new concrete evidence was recently published by Peter Tyack of the Woods Hole Oceanographic Institution in the PLos One journal. Dr. Tyack and his colleagues describe a study in the Bahamas where they used underwater microphones to monitor “clicks” emitted by Blainville’s beaked whales while hunting. The whales that were hunting around Navy’s test range started to emit fewer “clicks” as soon as the sonar exercises began and then swam away miles away from the sound. They did return to the same spot a few days later.
The problem is that sometimes the whales are unable to get out of the way of sonar quickly enough. The mid-frequency sonar blasts may drive certain whales to change their dive patters in a way their bodies can’t handle, causing fatal injuries. In fact, many of the beached whales have suffered physical trauma, including bleeding around brain, ears and other tissues. These are symptoms similar to “the bends”- the condition that can kill scuba divers if they surface too quickly.
On the occasions listed below testing of mid-frequency to low-frequency active sonar was conducted in the area.

  • 1996: 12 Cuvier’s beaked whales beached in Greece
  • 1999: 4 beaked whales beached in the US Virgin Islands
  • 2000: 3 beaked whales beached in Madeira
  • 2002: 14 different whales beached in the Canary Islands

http://news.discovery.com/animals/navy-sonar-scares-whales-110323.html


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