| Supplemental Student Support: Detection and Identification of Buried Targets using Time Reversal Acoustics |
04-Nov-2009 |
283 pages |
| Authors:
Ronald A Roy; Zachary J Walters; BOSTON UNIV MA
|
 | The presence of noise and coherent returns from clutter often confounds efforts to acoustically detect and identify target objects buried in inhomogeneous media. Using iterative time reversal with a single channel transducer, returns from resonant targets are enhanced, yielding convergence to a narrowband waveform characteristic of the dominant mode in a target's elastic scattering response. The procedure consists of exciting the target with a broadband acoustic pulse, sampling the return ... |
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| Monitoring Cetaceans in the North Pacific |
Apr-2009 |
18 pages |
| Authors:
Kathleen M Stafford; WASHINGTON UNIV SEATTLE APPLIED PHYSICS LAB
|
| Two projects were undertaken to monitor cetaceans in the North Pacific. The first was designed to obtain passive acoustic data from the U.S. Navy's Northern Edge Range. Three instruments were deployed in April 2008 to monitor both high (up to 25 kHz) and low (up to 1 kHz) frequencies for odontocetes and mysticetes, respectively. Unfortunately, these instruments did not record any data. The second project was to analyze retrospective data ... |
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| Acoustic and Visual Monitoring for Cetaceans Along the Outer Washington Coast |
01-Mar-2009 |
45 pages |
| Authors:
John Calambokidis; Greg Schorr; Erin Falcone; Erin M Oleson; John A Hildebrand; SCRIPPS INSTITUTION OF OCEANOGRAPHY LA JOLLA CA
|
| Since July 2004, visual and acoustic monitoring efforts for marine mammals have been conducted in waters off the outer Washington coast. These efforts have been specifically to determine the seasonal occurrence of marine mammal species and to estimate their relative abundances, particularly in the area of the proposed expansion of the U.S. Navy's Quinault Underwater Tracking Range (QUTR) of the Northwest Range Complex. This has resulted in the first multi-year, ... |
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| A Mathematical Model for the Acoustic and Seismic Properties of the Landmine Detection Problem |
06-May-2008 |
119 pages |
| Authors:
Michelle B Mattingly; NAVAL ACADEMY ANNAPOLIS MD
|
| Acoustic landmine detection is accomplished by using a loud speaker to generate airborne source low-frequency waves that are transmitted to the soil above a buried landmine target. At a specific frequency, the landmine will "vibrate" at resonance, imparting an enhanced velocity on the soil particles above it at the surface that is detected by a scanning Laser Doppler Vibrometer system. If the soil surface velocity profiles measured from these experiments ... |
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| Evaluation of Daytime Boundary Layer Heights from a Mesoscale Model Using Profilers/RASS Measurements |
01 MAR 2008 |
91 pages |
| Authors:
Lindsay A. Bloch; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| This thesis study focuses on the evaluation of the boundary layer height (BLH) diagnosed from a mesoscale model in comparison to wind profiler/Radio Acoustic Sounding System (RASS) measurements from the profiler site at Miramar Marine Corps Station (MMR). This objective is met through validation of the observed BLH and evaluations of the model BLH using the observed BLH's. In particular, two methods, one uses Signal-to-Noise-Ratio (SNR) from the profiler, and ... |
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| Comparison of Acoustic and Aerial Photographic Methods for Quantifying the Distribution of Submersed Aquatic Vegetation in Sagamore Creek, NH |
MAR 2008 |
30 pages |
| Authors:
Bruce Sabol; Elizabeth Lord; Kevin Reine; Deborah Shafer; ENGINEER RESEARCH AND DEVELOPMENT CENTER VICKSBURG MS ENVIRONMENTAL LAB
|
| Maintenance dredging in the Black Channel portion of the Portsmouth Harbor and Piscatiqua River Federal Navigation Project in Portsmouth (commonly referred to as Sagamore Creek) occurs in close proximity to submersed aquatic vegetation (SAV). Species, density, and spatial distribution are of concern to resource agencies given the potential impacts associated with dredging activities including the physical removal of vegetation as well as increases in turbidity and/or siltation. A variety of ... |
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| Distribution, Abundance and Population Structuring of Beaked Whales in the Great Bahama Canyon, Northern Bahamas |
Jan-2008 |
10 pages |
| Authors:
Diane E Claridge; John W Durban; NATIONAL MARINE MAMMAL LABORATORY SEATTLE WA
|
| The long-term goal of this project is to fill key data gaps on the population ecology of beaked whales, specifically relating to distribution, habitat use, abundance and population structuring in the northern Bahamas. The objectives of the three-year study are: 1) To use visual survey techniques to document beaked whale distribution and habitat use, and to estimate abundance in the Great Bahama Canyon (Figure 1). 2) To use photo-identification techniques ... |
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| 2006 Progress Report on Acoustic and Visual Monitoring for Cetaceans along the Outer Washington Coast |
AUG 2007 |
30 pages |
| Authors:
Erin M. Oleson; John A. Hildebrand; John Calambokidis; Greg Schorr; Erin Falcone; SCRIPPS INSTITUTION OF OCEANOGRAPHY LA JOLLA CA
|
| An acoustic and visual monitoring effort for cetaceans was initiated within the boundaries of the proposed expansion area for the Quinault Underwater Tracking Range in July 2004. Acoustic data collection consisted of recordings at a site on the continental shelf to the west of Cape Elizabeth and another in deep water within Quinault Canyon. An analysis plan for acoustic data is included. Results for 32 visual surveys are presented as ... |
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| Acoustic Propagation Through a Forest Edge: Data Report for Camp Ripley, Minnesota |
JUL 2007 |
66 pages |
| Authors:
Michelle E. Swearingen; Michael J. White; Patrick J. Guertin; Jeffrey A. Mifflin; Timothy E. Onder; Donald G. Albert; Stephen N. Decato; Arnold Tunick; ENGINEER RESEARCH AND DEVELOPMENT CENTER CHAMPAIGN IL CONSTRUCTION ENGINEERING RESEARCH LAB
|
| Acoustic propagation and diffraction of high-amplitude, short duration signals through a forest edge have implications for noise mitigation and battlefield acoustic sensors. While the acoustic significance of this unique environment has been noted in the past, it has not been studied in any detail. Acoustic signals that have propagated through a forest edge yield complicated pressure-time histories for receivers both within and outside the forest. Several physical processes contribute to ... |
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| Distribution, Abundance and Population Structuring of Beaked Whales in the Great Bahama Canyon, Northern Bahamas |
Jan-2007 |
11 pages |
| Authors:
Diane Claridge; John Durban; BAHAMAS MARINE MAMMAL RESEARCH ORGANISATION ABACO (BAHAMAS)
|
| The long-term goal of this project is to collect baseline data to fill critical data gaps on the population ecology of beaked whales in the northern Bahamas, specifically relating to distribution, habitat use, abundance and population structuring. The objectives of the three-year study are: 1) To use visual survey techniques to document beaked whale distribution and habitat use, and to estimate abundance in the Great Bahama Canyon (Figure 1). 2) ... |
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| Effect of Internal Solitary Waves on Mine Detection in the Western Philippine Sea East of Taiwan |
DEC 2006 |
138 pages |
| Authors:
Chung-Ping Hsieh; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| Upper layer temperature in the western Philippine Sea near Taiwan was sampled using a coastal monitoring buoy with fifteen thermistors attached from July 28 August 7, 2005. Internal waves and internal solitons (IS) were identified using the empirical orthogonal function analysis. Without the IW and IS, the power spectra, structure functions, and singular measures (representing the intermittency) of the temperature field satisfy the power law with multi-scale characteristics at all ... |
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| Acoustic Rapid COTS Insertion: A Case Study in Spiral Development |
30 OCT 2006 |
87 pages |
| Authors:
Michael Boudreau; NAVAL POSTGRADUATE SCHOOL MONTEREY CA GRADUATE SCHOOL OF BUSINESS AND PUBLIC POLICY
|
| Acoustic Rapid COTS Insertion (A-RCI) is a success story in the use of Modular Open Systems Approach (MOSA)/Open Architecture (OA) beginning with towed-array sonar on 688 Class Submarines and later encompassing all sonar systems on all attack submarines, some surface ship sonar applications, and even aviation anti-submarine warfare. The Department of Defense (DoD) has long considered Open Systems Design a best practice that should be used during system development. However, ... |
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| Advances in Acoustic Landmine Detection |
01 OCT 2006 |
11 pages |
| Authors:
James A. Sabatier; MISSISSIPPI UNIV UNIVERSITY
|
| The phenomenon of the acoustic-to-seismic (A/S) coupling of airborne sound into the ground for buried anti-personnel and anti-tank landmine detection is well established [J. M. Sabatier and N. Xiang, IEEE Trans. on Geoscience & Remote Sensing, 39, pp 1146-1154 (2001); N. Xiang and J. M. Sabatier, J. Acoust. Soc. Am, 113, pp.1333-1341 (2003)]. A sound source is used to insonify the ground surface. The airborne sound couples into the soil ... |
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| Adaptive Track Detection for Multi-Static Active Sonar Systems |
Sep-2006 |
7 pages |
| Authors:
Christian G Hempel; NAVAL UNDERSEA WARFARE CENTER DIV NEWPORT RI
|
| Multi-static active sonar systems detect contacts of interest by transmitting coherent waveforms and detecting the echoes on one or more receiving sensors. When a target of interest is in a region where its echoes are detectable by more than one receiver it can, in general, be declared sooner by combining the measurements from all sensors. The track detection schemes used in active sonar systems are often based on the Wald ... |
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| Spatial Correlation Coefficient Images for Ultrasonic Detection (Preprint) |
JUL 2006 |
24 pages |
| Authors:
Raina Cepel; K. C. Ho; Brett A. Rinker; Jr. Palmer; Terrence P. Lerch; Steven P. Neal; MISSOURI UNIV-COLUMBIA DEPARTMENT OF MECHANICAL AND AEROSPACE ENGINEERING
|
| In ultrasonics, image formation and detection are generally based on signal amplitude. In this paper, we describe an amplitude independent approach for image formation and detection based on the similarity of adjacent signals. Signal similarity is quantified in terms of the correlation coefficient calculated between A-scans digitized at adjacent measurement positions. Correlation coefficient images are introduced for visualizing the similarity in measured A-scans. In backscatter, the approach reveals defect signals ... |
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| Advanced Detection and Classification Algorithms for Acoustic-Color-Based Sonar Systems |
29 JUN 2006 |
7 pages |
| Authors:
Lawrence Carin; SIGNAL INNOVATIONS GROUP INC DURHAM NC
|
| Signal Innovations Group (SIG) has been working closely with the Naval Research Laboratory (NRL) on development of advanced algorithms for detection and classifying MCM targets, with data collected using the NRL sonar system. Over the current period of performance SIG has delivered to NRL kernel matching pursuits (KMP) software, that was employed by NRL at the most recent blind test. Details on the KMP algorithm are provided below. Additionally, NRL ... |
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| Shallow Seabed Methane Gas Could Pose Coastal Hazard |
30 MAY 2006 |
3 pages |
| Authors:
Angus I. Best; Michael D. Richardson; Bernard P. Boudreau; Alan G. Judd; Ira Leifer; Anthony P. Lyons; Christopher S. Martens; Danial L. Orange; Simon J. Wheeler; NAVAL RESEARCH LAB STENNIS SPACE CENTER MS SEAFLOOR SCIENCES DIRECTORATE
|
| Abnormally high levels of methane gas in seafloor sediments could pose a major hazard to coastal populations within the next 100 years through their impact on climate change and sea level rise. Marine scientists have known for many years that biogenic methane (CH4) is generated in shallow seabed sediments on continental margins, especially in rapidly deposited muddy sediments with high organic matter content. Grassy sediments are found in river deltas, ... |
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| Environmentally Adaptive Reverberation Nulling |
15 APR 2006 |
11 pages |
| Authors:
William A. Kuperman; William S. Hodgkiss; SCRIPPS INSTITUTION OF OCEANOGRAPHY LA JOLLA CA MARINE PHYSICAL LAB
|
| This report describes the research performed on behalf of the Office of Naval Research (grant # N00014-01-D-0043 Delivery Order 0007) on the following: The feasibility of enhancing active target detection using environmentally adaptive reverberation nulling techniques has been demonstrated with experimental data and related simulations. |
|
| SIHS TD Literature Review: Issues in Restorative Hearing |
APR 2006 |
|
| Authors:
Andrew Morton; HUMANSYSTEMS INC GUELPH (ONTARIO)
|
 | The auditory sense is a significant perceptual component of the dismounted infantry soldier's situation awareness. However, battlefield noise hazards necessitate the use of perceptually isolating hearing protection. This report seeks to review the progress made and key issues identified in developing a system to restore hearing capabilities to the protected listener. The auditory needs of the dismounted infantry soldier are described, followed by a description of the noise hazards encountered ... |
|
| Simulation of the Acoustic Pulse Expected from the Interaction of Ultra-High Energy Neutrinos and Seawater |
MAR 2006 |
79 pages |
| Authors:
Michael Gruell; NAVAL POSTGRADUATE SCHOOL MONTEREY CA DEPT OF PHYSICS
|
| The purpose of this thesis was to design, build, and test a device capable of simulating the acoustic pulse expected from the interaction between an Ultra-High Energy (UHE) neutrino and seawater. When a neutrino interacts with seawater, the reaction creates a long, narrow shower of sub-atomic particles. The energy from this reaction causes nearly instantaneous heating of the seawater on an acoustic timescale. The acoustic pulse created by the resulting ... |
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| Landmine Detection using Laser Vibrometry |
JAN 2006 |
|
| Authors:
J. C. Van Den Heuvel; A. C. Van Koersel; F. J. Van Putten; H. M. Schleijpen; TNO Defence Security and Safety The Hague (Netherlands)
|
| Acoustic Landmine Detection (ALD) using a laser vibrometry was studied using two acoustic ground excitation methods: acoustic (loudspeaker) excitation (AE) and laser excitation (LE). AE is suitable for detecting buried landmines but is a slow technique. A faster AE method based on a CMOS camera was proposed but not studied further. LE is potentially a faster technique but suffers from surface effects. An important surface effect is the relaxation of ... |
|
| Evidence for an Infrasound Waveguide |
NOV 2005 |
8 pages |
| Authors:
Eugene Herrin; Tae Sung Kim; Brian Stump; SOUTHERN METHODIST UNIV DALLAS TX DEPTOF GEOLOGICAL SCIENCES
|
| On May 30, 2005, eight strongly dispersed infrasound signals were recorded at one seismo-acoustic array in the Republic of Korea. Phase-matched filtering (Herrin & Goforth, 1977) and a forward modeling technique were used to determine the nature of the dispersion. The most likely explanation for these dispersed infrasound signals is that the dispersion is due to propagation down a low-velocity waveguide: This can be characterized as an ephemeral "SOFAR" layer ... |
|
| A Book of Abstracts for the 2005 Underwater Acoustic Signal Processing Workshop held October 5-7, 2005 at Alton Jones Campus, University of Rhode Island, West Greenwich, Rhode Island, USA |
07 OCT 2005 |
42 pages |
| Authors:
Richard J. Vaccaro; RHODE ISLAND UNIV KINGSTON
|
| This document is a Book of Abstracts for the 2005 Underwater Acoustic Signal Processing Workshop. |
|
| Acoustic Emission Based Surveillance System for Prediction of Stress Fractures |
SEP 2005 |
21 pages |
| Authors:
Ozan Akkus; Nicholas Wasserman; TOLEDO UNIV OH
|
| Stress fractures of bone constitute the most serious musculoskeletal overuse injury during military training of male and female recruits. We believe that the cascade of events in stress fractures is structured as the upregulation of bone turnover, amplification of porosity, induction of greater local strains and associated increase in damage activity a priori to fracture. The hypothesis of our study is that the onset of stress fractures can be predicted ... |
|
| Internal Damage Detection and Assessment in Beams Using Experimental Natural Frequencies |
13 JUN 2005 |
143 pages |
| Authors:
Frances K. Durham; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING AND MANAGEMENT
|
| This study investigated the frequency response of a cantilever beam with the intent of establishing a reliable nondestructive method of damage detection. The test specimens were 12 aluminum 2024 T3 beams, each identical except for a unique, eccentrically located notch, and one reference notchless beam. The machined notches varied in length and location to simulate varying degrees of damage. Laser doppler vibrometry enabled the data acquisition. The changes in natural ... |
|
| The Beaufort Gyre Observing System 2004: Mooring Recovery and Deployment Operations in Pack Ice |
MAY 2005 |
33 pages |
| Authors:
J. Kemp; K. Newhall; W. Ostrom; R. Krishfield; Andrey Proshutinsky; WOODS HOLE OCEANOGRAPHIC INSTITUTION MA DEPT OF APPLIED OCEAN PHYSICS AND ENGINEERING
|
| In this technical report, the authors describe the methods of recovering and re-deploying instrumented deep-ocean bottom-tethered moorings within the Arctic perennial ice pack from icebreakers without diver assistance. Situated beneath the Arctic perennial ice pack, the principal components of the Beaufort Gyre Observing System are three deep ocean, bottom-tethered moorings with CTD and velocity profilers, upward looking sonars for ice draft measurements, and bottom pressure recorders. A major goal of ... |
|
| Acoustic Time Reversal in the Shallow Ocean |
17 MAR 2005 |
5 pages |
| Authors:
David R. Dowling; MICHIGAN UNIV ANN ARBOR DEPT OF MECHANICAL ENGINEERING
|
| Acoustic time reversal is of interest to the United States Navy because it is an effective means for focusing sound in unknown underwater environments. For the last nine years, the Office of Naval Research has supported theoretical and numerical investigations at the University of Michigan into the performance of time reversing arrays in the ocean. This report summarizes the research accomplishments of these investigations. |
|
| Effect of Suspended Sediment on Acoustic Detection Using Reverberation |
2005 |
6 pages |
| Authors:
Peter C. Chu; Michael Cornelius; Mel Wagstaff; NAVAL POSTGRADUATE SCHOOL MONTEREY CA NAVAL OCEAN ANALYSIS AND PREDICTION LAB
|
| Sonar operates by ensonifying a broad swath of the seabed using a line array of acoustic projectors with acoustic backscattering from the ensonified sediment. The suspended sediment layer affects the sonar imagery through the volume scattering strength. Understanding the acoustic characteristics of the suspended sediment layer can aid the Navy in detecting sea mines with sonar imagery. In this study, the Navy's Comprehensive Acoustic Simulation System is used to investigate ... |
|
| Incorporation of Atmospheric Flow Fields and Ground Interactions into Acoustic Finite-Difference, Time-Domain Simulations |
DEC 2004 |
9 pages |
| Authors:
D. K. Wilson; David H. Marlin; Sandra L. Collier; Neill P. Symons; David F. Aldrige; Vladimir E. Ostashev; COLD REGIONS RESEARCH AND ENGINEERING LAB HANOVER NH
|
| By providing highly realistic simulations of sound propagation through complex atmospheric and terrain environments, finite-difference time- domain (FDTD) techniques can potentially reduce development time and improve the battlefield performance of acoustic sensors. In this paper, we summarize recent progress in improving two key aspects of acoustic FDTD calculations for the atmosphere: (1) development of a rigorous implementation of sound propagation in a moving, inhomogeneous fluid, and (2) formulation and numerical ... |
|
| Acoustic Detection from Aerial Balloon Platform |
DEC 2004 |
9 pages |
| Authors:
C. Reiff; T. Pham; M. Scanlon; J. Noble; A. Van Landuyt; J. Petek; J. Ratches; ARMY RESEARCH LAB ADELPHI MD
|
| The US Army Research Laboratory (ARL) and US Army Night Vision and Electronic Sensors Directorate (NVESD) are leading the research and development in autonomous sensing and sensor networks for the Networked Sensors for the Future Force (NSfFF) and Future Combat System (FCS). With the emphasis being shifted to lighter and more mobile forces, ARL and NVESD have been collaborating and exploring various mobile platforms such as robotic vehicles and aerial ... |
|
| Volume Sensor Development Test Series 2- Lighting Conditions, Camera Settings, and Spectral and Acoustic Signatures (CD-ROM) |
24 NOV 2004 |
|
| Authors:
James A. Lynch; Susan L. Rose-Pehrsson; Daniel A. Steinhurst; Stephen C. Wales; Frederick W. Williams; NAVAL RESEARCH LAB WASHINGTON DC
|
| ELECTRONIC FILE CHARACTERISTICS: 776 files; Adobe Acrobat (.PDF), Bitmap (.BMP), .JPEG image, and DataLogger files. PHYSICAL DESCRIPTION: 1 CD-ROM; 4 3/4 in.; 283 MB and 1 hardcopy final report. SYSTEMS DETAIL NOTE: ABSTRACT: Real-scale fire tests in mock ship compartments were conducted to collect data of acoustic and spectral sensors and to experimentally evaluate the fire detection performance of three commercially available video image fire detection systems under various ... |
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| Wearable Sparse-Conformal-Acoustic-Networks for Tracking and ID of Urban Targets (CD-ROM) |
17 NOV 2004 |
|
| Authors:
Bernard Widrow; Victor Eliashberg; CARDINAL RESEARCH LLC STANFORD CA
|
| ELECTRONIC FILE CHARACTERISTICS: 72 files; Adobe Acrobat (.PDF), MS Word (.DOC), and Winamp media file (.WAV). PHYSICAL DESCRIPTION: 1 CD-ROM; 4 3/4 in.; 14 MB. SYSTEMS DETAIL NOTE: ABSTRACT: The objective of the research is the development of wearable acoustic array technology to enable a wirelessly connected squad of soldiers in an urban battle field to detect, localize, track, and categorize acoustic target signals. For the individual soldiers, sensitive ... |
|
| Effect of Sonic Thermographic Inspection on Fatigue Crack Growth in an Al Alloy |
OCT 2004 |
|
| Authors:
Kelly A. Tsoi; Nik Rajic; DEFENCE SCIENCE AND TECHNOLOGY ORGANISATION VICTORIA (AUSTRALIA) AIR VEHICLES DIV
|
| Sonic thermography has recently emerged as an important inspection technique capable of resolving inspection problems that contemporary methods have struggled with, such as tightly closed cracks in metallic structures and kissing bonds in composite repairs. The technique uses elastic waves injected by an acoustic horn resonating at typically either 20 or 40 kHz, which often excites lateral motion at the surfaces of a defect. This motion induces frictional heating and ... |
|
| Location, Characterization and Quantification of Hydroacoustic Signals in the Indian Ocean |
OCT 2004 |
60 pages |
| Authors:
M. Tolstoy; D. R. Bohnenstiehl; LAMONT-DOHERTY EARTH OBSERVATORY PALISADES NY
|
| In this final report we summarize research accomplished on the project titled, Location, Characterization and Quantification of Hydroacoustic Signals in the Indian Ocean. Our initial goals were to locate, characterize and quantify hydroacoustic signals recorded on the three available hydroacoustic stations in the Indian Ocean, and this was accomplished for available data through May 2003. However, shortly thereafter our contract was rescoped to focus on high frequency propagation through the ... |
|
| Utilizing Network-Enabled Command and Control Concepts to Enhance ASW Effectiveness |
SEP 2004 |
63 pages |
| Authors:
Ralph Klingbeil; John Shannon; George Galdorisi; NAVAL UNDERSEA WARFARE CENTER DIV NEWPORT RI
|
| This report describes an analysis of two selected concepts for improving Anti-Submarine Warfare (ASW) performance and effectiveness by means of network-enabled sharing of information during ASW operations. These concepts are identified as Shared Situational Awareness (SSA) and Collaborative Information Environment (CIE). It is shown that the application of queueing theory models provide useful tools for quantitatively estimating the value-added of implementing these concepts. In addition, queueing theory can be used ... |
|
| Blind Beamforming for Collaborative Array Processing in Sensor Networks |
MAY 2004 |
12 pages |
| Authors:
Kung Yao; CALIFORNIA UNIV LOS ANGELES DEPT OF COMPUTER SCIENCE
|
| The detection, localization, tracking, and identification of a single target by acoustical/seismic measured data are fairly well understood. Many of the methods considered in the SensIT program proven in various ways for a single target in an open-air environment, will not be applicable to multiple targets. In the proposal, we advocated a new algorithm based on an efficient computational Approximate Maximum-Likelihood (AML) method using alternate projection to tackle the multiple ... |
|
| Ecological Displays for Robot Interaction: A New Perspective |
2004 |
7 pages |
| Authors:
Robert W. Ricks; Curtis W. Nielsen; Michael A. Goodrich; BRIGHAM YOUNG UNIV PROVO UT
|
| Most interfaces for robot control have focused on providing users with the most current information and giving status messages about what the robot is doing. While this may work for people who are already experienced in robotics, an alternative paradigm is needed for enabling new users to control robots effectively. Instead of approaching the problem as an issue of what information could be useful, the focus should be on presenting ... |
|
| An Apparatus for Deploying and Recovering a Towed Acoustic Line Array from an Unmanned Undersea Vehicle |
08 DEC 2003 |
17 pages |
| Authors:
Richard M. Ead; DEPARTMENT OF THE NAVY WASHINGTON DC
|
| A free flooded section of an unmanned undersea vehicle (UUV) contains a rotating cylindrical drum, which serves as a spool for a towed line array cable. At the end of the cable is a reverse thruster with the ability to propel itself away from the UUV when the UUV is submerged. The thruster moves away from the UUV, pulling the cable and unspooling it as it does so in order ... |
|
| Marine Mammal Aerial Surveys in Bahamas and Hawaii |
DEC 2003 |
12 pages |
| Authors:
Joseph R. Mobley Jr; MARINE MAMMAL RESEARCH CONSULTANTS LTD HONOLULU HI
|
| Aerial surveys of marine mammals were performed as part of the Marine Mammal Monitoring on Navy Undersea Acoustic Ranges (3MR) program in three regions: a) Pacific Missile Range Facility (PMRF), Barking Sands, Kauai (BSURE and BARSTUR ranges; Jul 12-Nov 17, 2002); b) Bahamas (Northwest Providence Channel and AUTEC range; Jan 4-12, 2003); and c) main Hawaiian Islands (Feb 21- Apr 5, 2003). The mission was to identify species and record ... |
|
| Integration of InfraMAP with Near-Real-Time Atmospheric Characterizations and Applications to Infrasound Modeling |
13 NOV 2003 |
9 pages |
| Authors:
Robert G. Gibson; David E. Norris; BBN TECHNOLOGIES ARLINGTON VA
|
| Predicting the long-range propagation of infrasound relies on characterization of the propagation medium, namely, the global atmosphere from the ground to altitudes above 100 km. The ability to realistically model infrasound propagation depends on the fidelity of the atmospheric characterization. The analysis tool kit InfraMAP (Infrasound Modeling of Atmospheric Propagation) offers a range of options for specifying the propagation environment. The baseline capability utilizes global climatological models of temperature, wind, ... |
|
| A Nonlinear Programming Algorithm for Optimizing Conventional Beamformer Shading Weights |
10 NOV 2003 |
30 pages |
| Authors:
Thomas A. Wettergren; John P. Casey; Charles M. Traweek; NAVAL UNDERSEA WARFARE CENTER DIV NEWPORT RI
|
| A numerical method to determine the optimal shading weights for a conventional delay-and-sum beamformer has been developed. The method employs a maximization of the deflection coefficient under the constraint of maintaining signal gain. This provides an optimal array shading scheme based on available noise data. The algorithm has been implemented using off-the-shelf numerical methods that are applicable only for small arrays. For large arrays, a special- purpose optimization algorithm has ... |
|
| Nondestructive Evaluation (NDE) Technology Initiative Program (NTIP). Delivery Order 0032: MAUS Implementation for Corrosion/Crack Detection in Wing Structure - Phase III |
30 SEP 2003 |
48 pages |
| Authors:
Donald D. Palmer Jr.; Nancy L. Wood; BOEING CO ST LOUIS MO PHANTOM WORKS
|
| This report summarizes the results of Phase III of the "MAUS implementation for Corrosion/Crack Detection in Wing Structure" program. During Phase III, all system optimization activities, including hardware and software enhancements to improve ultrasonic pulse-echo data collection and data interpretation, were completed. Also completed was the B-52 upper wing spanwise splice inspection process development and validation. The automated second layer ultrasonic inspection procedure developed was designed to rapidly detect fatigue ... |
|
| Sensors for Micro Aerial Vehicles |
22 SEP 2003 |
26 pages |
| Authors:
Greg Mann; ARMY RESEARCH DEVELOPMENT AND ENGINEERING COMMAND REDSTONE ARSENAL AL
|
| Briefing charts from presentation of sensors and technologies developed for Micro Air Vehicles (MAV). |
|
| Environmentally Adaptive and Through-the-Sensor Efforts at NRL |
SEP 2003 |
12 pages |
| Authors:
Mike Harris; Will Avera; Dale Bibee; Don Walter; Brian Bourgeois; NAVAL RESEARCH LAB STENNIS SPACE CENTER MS MARINE GEOSCIENCES DIV
|
| The Naval Research Laboratory's Marine Geosciences Division is conducting research in Through-The-Sensor and Environmentally Adaptive Sensor Techniques. NRL's AutoSurveyTM system is an environmentally adaptive technique developed to minimize survey time in an area while obtaining the desired seafloor coverage. The effective swath of a multibeam survey system depends on water depth, sound velocity conditions, seafloor properties, and sensor settings. AutoSurvey monitors these conditions and using intelligent navigation adjusts ship track ... |
|
| Acoustic Lens Camera and Underwater Display Combine to Provide Efficient and Effective Hull and Berth Inspections |
Sep-2003 |
8 pages |
| Authors:
Edward O Belcher; Jeffery R Barone; Dennis G Gallagher; Ronald E Honaker; WASHINGTON UNIV SEATTLE APPLIED PHYSICS LAB
|
| With the advent of the War on Terrorism, and the formation of the Department of Homeland Security, security requirements for the nation's ports and harbors have increased exponentially. A grave threat to ports and harbors are mines or improvised explosive devices (IED) placed on ship hulls, piers, berths, and beds of harbors. Underwater detection is predominately carried out by divers. In dark, turbid water their searches require slow, tactile examinations. ... |
|
| Phase I: FY01 Investigative Study for the Advanced Volume Sensor |
30 JUN 2003 |
28 pages |
| Authors:
Susan L. Rose-Pehrsson; Jeffrey C. Owrutsky; Daniel T. Gottuk; Justin A. Geiman; Frederick W. Williams; NAVAL RESEARCH LAB WASHINGTON DC CHEMICAL DYNAMICS AND DIAGNOSTICS BRANCH
|
| This report presents an overview of relevant resesarch and commercially available products as of FY01 that utilize spatial and spectral methods for fire detection systems. New capabilities are desired that can monitor damage control events in an entire space at a mimmal cost. Optical detection methods are being investigated because this technology offers an effective means to monitor the entire space or volume without relying on diffusion of effluents to ... |
|
| SSC San Diego Biennial Review 2003. Vol 3: Intelligence, Surveillance, and Reconnaissance |
2003 |
58 pages |
| Authors:
Robert B. Olds Jr.; H. R. Everett; David Lapota; Vivian D. DiCristofaro; Mark V. Glover; Vincent McDonald; David Morin; Mark W. Owen; Joseph A. Rice; SPACE AND NAVAL WARFARE SYSTEMS CENTER SAN DIEGO CA
|
| Volume 3 of this Biennial Review features ten (10) technical papers describing and discussing innovative technologies being developed at the Spawar Systems Center in San Diego. |
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| A Methodology for the Assessment of the Capability of Inspection Systems for Detection of Subsurface Flaws in Aircraft Turbine Engine Components |
SEP 2002 |
138 pages |
| Authors:
R. H. Burkel; C. -p. Chiou; T. K. Keyes; W. Q. Meeker; J. H. Rose; GENERAL ELECTRIC CO CINCINNATI OH
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| A new methodology for determining probability of detection is described. Physical models are used heavily during the inspection process to minimize the amount of empirical data that must be gathered. This report includes a general review of various methodologies for determining probability of detection as well as a detailed discussion of the new approach that is being applied to the ultrasonic detection of internal inclusions in the rotating components of ... |
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| Multi-modal Speech Recognition Workshop 2002 |
12 JUN 2002 |
92 pages |
| Authors:
Sung H. Yoon; NORTH CAROLINA AGRICULTURAL AND TECHNICAL STATE UNIV GREENSBORO
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| Proceedings of the 2002 Multi-modal Speech Recognition Workshop held in Greensboro, North Carolina, June 10-12, 2002. Sponsored by Defense Advanced Research Projects Agency and the Center for Intelligent Mobile Information Systems, North Carolina A&T State University. The workshop consisted of two sessions; Session 1: Sensors and Sensor Fusion, and Session 2: Audio-Visual Speech Recognition. |
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| Inferring Bottom Acoustic Properties from AN/SQQ-32 Sonar Reverberation Data in Order to Reduce False Targets in Bottom/Buried Mine Detection |
APR 2002 |
11 pages |
| Authors:
Henry H. Howell; Robert H. Bourke; James H. Wilson; J. M. Null and; Josette Fabre; FLEET NUMERICAL OCEANOGRAPHIC CENTER MONTEREY CA
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| Bottom/sub bottom geoacoustic properties must be determined to high spatial resolution in order to reduce false targets for bottom/buried mine detection. Inversion techniques (ITs) are used to infer bottom geoacoustic properties using AN/SQQ-32 beam reverberation level (RL) time series data acquired in Rhode Island Sound in February 1993. A technique was developed wherein the deviation of the RL for an individual ping and beam from an area-wide average RL is ... |
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Reports by Keyword(s)
ACOUSTIC DETECTION
