| Layered Organization in the Coastal Ocean: Acoustical Data Acquisition Analyses and Synthesis |
04-Nov-2009 |
61 pages |
| Authors:
D V Holliday; RHODE ISLAND UNIV NARRAGANSETT GRADUATE SCHOOL OF OCEANOGRAPHY
|
 | The research conducted with the funding made available through this grant was from an ONR Departmental Research Initiative (DRI). The objective of the DRI was to better understand Layered Organization in the Coastal Ocean (LOCO). The explicit goal of the DRI was To understand the properties of densely concentrated, thin layers of planktonic biota that can occur in coastal ocean environments, and the interacting physical, chemical, biological and optical processes ... |
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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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| Broadband Multichannel Source-Receive Nodes |
27-Mar-2009 |
13 pages |
| Authors:
William S Hodgkiss; SCRIPPS INSTITUTION OF OCEANOGRAPHY LA JOLLA CA MARINE PHYSICAL LAB
|
| Two broadband multichannel source-receive nodes have been designed and fabricated for use in the investigation of both acoustic propagation perturbations caused by environmental fluctuations and acoustic data communications in the ocean. |
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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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| Layered Organization in the Coastal Ocean: Acoustical Data Acquisition, Analyses and Synthesis |
Jan-2008 |
10 pages |
| Authors:
D V Holliday; C F Greenlaw; RHODE ISLAND UNIV NARRAGANSETT GRADUATE SCHOOL OF OCEANOGRAPHY
|
| The long-term goal of our research is to improve our ability to observe the ocean's plants, animals, and their physical and chemical environment at the scales that control how they live, reproduce, and die. We are working with our colleagues in the ONR-sponsored research program on Layered Organization in the Coastal Ocean (LOCO) to jointly analyze data collected in Monterey Bay, CA during FY2002, 2005 and 2006. Our work this ... |
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| Continued Development of the SEAMAP Data Archive |
SEP 2007 |
21 pages |
| Authors:
Ben Best; Patrick Halpin; Andrew Read; DUKE UNIV BEAUFORT NC MARINE LAB
|
| Environmental laws and public concern require that the U.S. Navy conduct operations and training such that impacts to marine mammals are minimized and any adverse impacts mitigated. To that end, an archive of marine mammal distribution and movements is needed. The digital geo-referenced data archive known as Spatial Ecological Analysis of Megavertebrate Animal Populations (SEAMAP) is the world s largest public archive of marine mammal, seabird, and sea turtle observations. ... |
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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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| Mapping Clutter In Situ: Broadband Results from T-MAST 02 and Boundary 2004 |
Sep-2006 |
7 pages |
| Authors:
R C Gauss; J M Fialkowski; NAVAL RESEARCH LAB WASHINGTON DC
|
| This paper presents experimental results of applying two methods to help mitigate the seabed clutter problem by spatially isolating significant reverberant features in situ: 1) a clutter mapping technique applied to broadband (400 to 2500 Hz) acoustic data collected in the vicinity of the Stanton Banks off of Scotland during the T-MAST 02 experiment; and 2) the use of a cardioid receiver array on the Malta Plateau off of Sicily ... |
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| Acoustic Environment of Haro Strait: Preliminary Propagation Modeling and Data Analysis |
AUG 2006 |
53 pages |
| Authors:
Christopher D. Jones; Michael A. Wolfson; WASHINGTON UNIV SEATTLE APPLIED PHYSICS LAB
|
| Field measurements and acoustic propagation modeling for the frequency range 1 10 kHz are combined to analyze the acoustic environment of Haro Strait of Puget Sound, home to the southern resident killer whales. Haro Strait is a highly variable acoustic environment with active commercial shipping, whale watching, and Naval activity. Southern resident killer whales are of unique public concern in this area because of increasing anthropogenic noise levels that may ... |
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| Seismic-Acoustic Active Range Monitoring for Characterizing Low-Order Ordnance Detonation |
APR 2006 |
31 pages |
| Authors:
Thomas S. Anderson; Jason C. Weale; ENGINEERING RESEARCH AND DEVELOPMENT CENTER HANOVER NH COLD REGIONS RESEARCH AND ENGINEERING LAB
|
| A seismic-acoustic field data acquisition experiment was conducted in March 2005 to support the ERDC Environmental Quality program, Distributed Source focus area. The Distributed Sources focus area strives to characterize the level of contamination in range environments attributed to ordnance residue for the purpose of range management and environmental remediation. This remote sensing research project emphasizes seismic magnitude measurements and subsequent inference of partial detonations and unexploded ordnance. The analysis ... |
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| Statistical Analyses of Marine Mammal Occurrence, Habitat Associations and Interactions with Ocean Dynamic Features |
30 MAR 2006 |
|
| Authors:
Peter L. Tyack; Arianna Azzellino; WOODS HOLE OCEANOGRAPHIC INSTITUTION MA
|
 | This work is sponsored by ONR as part of a joint research project with the NATO SACLANT Center Sound, Oceanography and Living MArine Resources (SOLMAR) project in La Spezia, Italy. Within this SACLANTCEN project multiple interdisciplinary sea trials (Sirena campaigns) have been successfully conducted in the northwestern Mediterranean Sea since 1999. Six sea trials have been conducted in the northwestern Mediterranean Sea from 1999 to 2003 during the late spring/summer ... |
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| Fuzzy Logic for Unattended Ground Sensor Fusion |
JAN 2006 |
63 pages |
| Authors:
Arjun Bharadwaj; Jerry M. Mendel; UNIVERSITY OF SOUTHERN CALIFORNIA LOS ANGELES SIGNAL AND IMAGE PROCESSING INST
|
| This report summarizes our research for the year January 2005 to Decenber 2005. We have developed multi-category classifiers based on seismic data to classify heavy-tracked, light-tracked, heavy-wheeled and light-wheeled ground vehicles. We focused on data collected in the normal terrain. We also developed fusion algorithms for type-1 and type-2 Fuzzy logic Rule-Based Classifiers (FL-RBCs) based on the Choquet Fuzzy Integral (CFI). We conducted experiments to evaluate the performance of the ... |
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| Scientific Analysis of ASIAEX South China Sea Data |
18 AUG 2005 |
3 pages |
| Authors:
Timothy F. Duda; WOODS HOLE OCEANOGRAPHIC INSTITUTION MA
|
| This grant funded follow-up work with data collected under other ONR grants during the 2001 South China Sea portion of the Asian Seas International Acoustics Experiment (ASIAEX). The goals of the effort were to further explain the nature of the fluctuating acoustic signals transmitted from fixed sources to fixed receivers, and to study characteristics of the ambient noise. Both studies are in the band of 200-450 Hz. The received signals ... |
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| Investigation of Outer Length Scale In Optical Turbulence Using an Acoustic Sounder |
SEP 2004 |
53 pages |
| Authors:
Jeffrey T. Douds; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
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| The horizontal separations between convective thermal plumes, and features within a thermal plume, were determined through the use of an acoustic sounder, an anemometer and extensive data analysis. The mean, standard deviation, median and mode were calculated for the computed correlation lengths of the acoustic sounder data sampled in time intervals of 2, 5 and 10 minutes. The data sampled at 2 and 5-minute intervals emphasized features within an individual ... |
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| Analysis of Acoustic Data Under Response of Sperm Whales to Air Gun Sounds in the Gulf of Mexico |
21 MAY 2004 |
4 pages |
| Authors:
Aaron M. Thode; SCRIPPS INSTITUTION OF OCEANOGRAPHY LA JOLLA CA MARINE PHYSICAL LAB
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| To field-test an automated procedure for passively tracking sperm whales in three-dimensions, using natural vocalizations recorded on two towed arrays, deployed either alone or in conjunction with dive tags. The algorithms would permit automated tracking of multiple animals over complete dive cycles, producing statistically significant sample sizes for evaluation of controlled- exposure studies. When used in conjunction with a dive tag, the algorithm would permit better resolution tracking of animals ... |
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| Low-Frequency Acoustic Propagation Loss in the Arctic Ocean: Results of the Arctic Climate Observations using Underwater Sound Experiment |
05 MAR 2004 |
54 pages |
| Authors:
Alexander N. Gavrilov; Peter N. Mikhalevsky; SCIENCE APPLICATIONS INTERNATIONAL CORPMCLEAN VA
|
| Acoustic data from the Arctic Climate Observations using Underwater Sound (ACOUS) experiment are analyzed to determine the correlation between acoustic propagation loss and the seasonal variability of sea ice thickness. The objective of this research is to provide long-term synoptic monitoring of sea ice thickness, an important global climate variable, using acoustic remote sensing. As part of the ACOUS program an autonomous acoustic source deployed northwest of Franz Josef Land ... |
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| A Review of the ACOUS Experiment Results |
JAN 2004 |
14 pages |
| Authors:
Alexander Gavrilov; SCIENCE APPLICATIONS INTERNATIONAL CORPMCLEAN VA
|
| This technical report briefly summarizes the results of the Arctic Climate Observations using Underwater Sound (ACOUS) experiment conducted in October 1998 - December 1999. The most important scientific achievements of the experiment are presented. The methods of acoustic inversion for acoustic thermometry in the Arctic Ocean are discussed using the conclusions that were made after processing and interpretation of the ACOUS data. Some technical issues are considered to bring about ... |
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| Acoustic Data Collection of Tactical Unmanned Air Vehicles (TUAVs) |
DEC 2002 |
47 pages |
| Authors:
Tien Pham; Leng Sim; ARMY RESEARCH LAB ADELPHI MD
|
| This report discusses the data collection experiments of tactical unmanned air vehicles (TUAVs) conducted by the U.S. Army Research Laboratory of Webster Airfield, Patuxent River, MD in October 2001 and January 2002. The purpose of these data collection experiments was to collect raw acoustic signatures of TUAVs and to develop an acoustic database to support activities of the Action Group 6 (AG6) under the Technical Cooperative Program. The AG6's main ... |
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| Analysis of Sonic Anemometer Data from the CASES-99 Field Experiment |
JUL 2002 |
67 pages |
| Authors:
Giap D. Huynh; Sam S. Chang; ARMY RESEARCH LAB ADELPHI MD COMPUTATIONAL AND INFORMATION SCIENCES DIRECTORATE
|
| The Cooperative Atmosphere-Surface Exchange Study conducted near Leon, KS in October 1999 (CASES-99) is a multidisciplinary effort to study the interaction of the lower atmosphere with the land surface. Seven three-axis sonic anemometers from the U.S. Army Research Laboratory were deployed on five towers during the CASES-99 field campaign. Each of them has collected more than 100 hr of data. This report describes our data collection and processing details, and ... |
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| Autonomous Acoustic Source |
JUN 2002 |
9 pages |
| Authors:
William S. Hodgkiss; CALIFORNIA UNIV REGENTS LA JOLLA CA SCRIPPS INST OF OCEANOGRAPHY
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| An autonomous acoustic source buoy system has been designed and fabricated for use in the collection of underwater acoustic propagation data. The system consists of a surface buoy which provides battery power, signal waveform synthesis, power amplification, system control, and wireless local area network (WLAN) communications. |
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| Wavelet Digital Signal Processing of Undersea Acoustic Data |
APR 2002 |
11 pages |
| Authors:
Juliette W. Ioup; George E. Ioup; Joseph S. Wheatley; NEW ORLEANS UNIV LA DEPT OF PHYSICS
|
| Chirplet signal reconstruction algorithms have been developed using MATLAB. A Flexible Chirplet Transform algorithm has been developed. Building and implementation of chirplet reconstruction algorithms have been completed successfully. Feature extraction and noise removal for low frequency acoustic chirp signals have been completed using scalar wavelet, wavelet packet, multiwavelet, and chirplet and Fourier techniques. Comparison of these methods has been performed, and the results have been analyzed. Adaptive wavelet transform algorithms ... |
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| Four-Dimensional Data Assimilation for Coupled Physical-Acoustical Fields |
01-Jan-2002 |
9 pages |
| Authors:
P F Lermusiaux; C S Chiu; HARVARD UNIV CAMBRIDGE MA DIV OF ENGINEERING AND APPLIED SCIENCES
|
| The estimation of oceanic environmental and acoustical fields is considered as a single coupled data assimilation problem. The four-dimensional data assimilation methodology employed is Error Subspace Statistical Estimation. Environmental fields and their dominant uncertainties are predicted by an ocean dynamical model and transferred to acoustical fields and uncertainties by an acoustic propagation model. The resulting coupled dominant uncertainties define the error subspace. The available physical and acoustical data are then ... |
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| Tidal Analysis Near the Shelfbreak in the Middle Atlantic Bight |
22 JUN 2001 |
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| Authors:
Glen Gawarkiewicz; James Lynch; Albert Plueddemann; WOODS HOLE OCEANOGRAPHIC INSTITUTION MA
|
| This project involved an AASERT grant to perform analysis of acoustic and oceanographic data from the Shelfbreak PRIMER experiment. The student completed his Ph.D. within the MIT/WHOI Joint Program. The thesis was entitled 'Analysis of Acoustic Propagations in the region of the New England Continental Shelfbreak' by Brian Sperry. |
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| Mapping and Analyzing Acoustic Surveys' Results: A GIS Approach |
2001 |
3 pages |
| Authors:
Michele Manghi; Gianni Pavan; Claudio Fossati; Marco Priano; PAVIA UNIV (ITALY)
|
| C.I.B.R.A. is a research group whose main interest is in the study of underwater sounds related to marine mammals and in the development of acoustic detection and analysis technologies. The "acoustic" aspect in wide area studies, critical habitat identification and population distribution has become more and more popular. According to our experience it is a difficult task to integrate, in one scheme, acoustic evidences with other data sets like remote ... |
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| Distribution of Calling Blue, Fin, and Humpback Whales in the North Pacific |
DEC 2000 |
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| Authors:
William A. Watkins; Mary A. Daher; Joseph E. George; Scott Haga; WOODS HOLE OCEANOGRAPHIC INSTITUTION MA
|
| The seasonal distribution of calling blue whales (Balaenoptera musculus) and fin whales (B. physalus), and singing humpback whales (Megaptera novaeangliae) has been analyzed from acoustic data recorded by U.S. Navy Sound Surveillance System (SOSUS) and other hydrophone arrays in the North Pacific. The data from ten arrays were selected as representative of four Regions along the continental margins, labeled Northwest (NW), Northcentral (NC), Northeast (NE), and Southeast (SE). The call ... |
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| Experimental and Theoretical Study of Cavity Acoustics |
MAY 2000 |
213 pages |
| Authors:
R. E. Dix; R. C. Bauer; SVERDRUP TECHNOLOGY INC ARNOLD AFS TN
|
| Between 1986 and 1990, a large database was compiled at AEDC from the results of a series of wind tunnel experiments investigating the aerodynamics of flow over open cavities. The database, known as the Weapons Internal Carriage and Separation (WICS) database, covered four experiments that were completed in the AEDC wind tunnels. The initial database documentation focused on the test and data, but included very little analysis ... |
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| Harsh Environment Program Data Collection. LWAD 00-1 Technical Note (CD-ROM) |
MAY 2000 |
|
| Authors:
D. Volak; R. Gindhart; Arthur Horbach; NAVAL AIR WARFARE CENTER AIRCRAFT DIV PATUXENT RIVER MD
|
| ELECTRONIC FILE CHARACTERISTICS: 418 files; Adobe Acrobat PDF, MS Excel, MS Word 97, MS PowerPoint. PHYSICAL DESCRIPTION: 1 computer laser optical disc (CD-ROM); 4 3/4 in. SYSTEMS DETAIL NOTE: Requires CD-ROM drive. ABSTRACT: Ocean environmental acoustic data was collected by a P-3 in order to characterize the environment off the east coast of the United States. The data was analyzed to make calibrated measurements of reverberation and transmission loss, with ... |
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| An Environmental Assessment in the Strait of Sicily: Measurement and Analysis Techniques for Determining Bottom and Oceanographic Properties |
JAN 2000 |
54 pages |
| Authors:
Martin Siderius; Mirjam Snellen; Dick Simons; Reiner Onken; SACLANT UNDERSEA RESEARCH CENTRE LA SPEZIA (ITALY)
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| In October 1997, the EnVerse 97 shallow water acoustic experiments were jointly conducted by SACLANT Centre, TNO-FEL and DERA off the coast of Sicily, Italy. The primary goal of the experiments was to determine the seabed properties through inversion of acoustic data. Using a towed source, the inversion method is tested at different source/receiver separations in an area with a range-dependent bottom. The sources transmitted ... |
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| Field-Deployable Acoustic Digital Systems for Noise Measurement |
2000 |
19 pages |
| Authors:
Qamar A. Shams; Kenneth D. Wright; Charles B. Lunsford; Charlie D. Smith; NATIONAL AERONAUTICS AND SPACE ADMINISTRATION HAMPTON VA LANGLEY RESEARCH CENTER
|
| Langley Research Center (LaRC) has for years been a leader in field acoustic array measurement technique. Two field-deployable digital measurement systems have been developed to support acoustic research programs at LaRC. For several years, LaRC has used the Digital Acoustic Measurement System(DAMS) for measuring the acoustic noise levels from rotorcraft and tiltrotor aircraft. Recently, a second system called Remote Acquisition and Storage System(RASS) was developed and deployed for the first ... |
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| The U.S. Army Research Laboratory's Acoustic & Seismic Database and User Interface Software |
NOV 1999 |
16 pages |
| Authors:
Anh Nguyen; Leng Sim; Ramaz Kvavilashvili; ARMY RESEARCH LAB ADELPHI MD
|
| The U.S. Army Research Laboratory's (ARL) acoustic and seismic data consist of various time-series signatures of battlefield ground and air targets. These signatures were collected from a number of sensor arrays placed within detection range of the targets travel path. The growth of the collected acoustic and seismic data in the past few years has resulted in an inevitable need for a database. As the first phase of ARL's Automatic ... |
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| Method for Enhancing Signal-to-Noise Ratio and Resolution of Amplitude Stable Signals. |
23 MAR 1999 |
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| Authors:
Ronald A. Wagstaff; Susan D. Gardner; NAVAL RESEARCH LAB WASHINGTON DC
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| A method for enhancing signal-to-noise ratio and resolution of amplitude stable signals wherein underwater acoustic data is first collected with an array of hydrophones, and then the data is digitally sampled. After producing spectra of sequential time snapshots of the digitally-sampled data, the spectra are beamformed for a single frequency. Next the low resolution beamformer response is deconvolved from the data by use of a calculated beam response pattern for ... |
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| Data Acquisition System Including Data Transmission Controller for Octavely Nested Acoustic Line Arrays |
10 MAR 1999 |
26 pages |
| Authors:
Steven D. Jette; DEPARTMENT OF THE NAVY WASHINGTON DC
|
| A data acquisition system receives an analog input signal comprising a plurality of octavely-nested components including a base octave and a selected number of higher-level octaves, and transmits digital data words representative of each component over a channel. The data acquisition system includes a data transmission system and an interface. The data transmission controller generates transmission strobes signals defining a series of octave transmission cycles each associated with one of ... |
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| Wide-Angle, Forward-Looking Bathymetric Mapping |
22 SEP 1998 |
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| Authors:
Michael R. Medeiros; DEPARTMENT OF THE NAVY WASHINGTON DC
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| A system for generating a wide-angle, forward-looking bathymetric map of the an region ensonified by single ping. A transmitter generates a large angle transmit pulse. An array of acoustic transducer elements operates to transmit the pulse, receive acoustic return signals and convert the returns into digital acoustic data. A receiver matched filters, shades and steers the data through a series of horizontal angles. For each horizontal angle steered to, the ... |
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| Establishment of Acoustic Reverberation Special Research Program (ARSRP) Data Archive |
11 MAY 1998 |
5 pages |
| Authors:
John A. Orcutt; SCRIPPS INSTITUTION OF OCEANOGRAPHY LA JOLLA CA
|
| We have developed a database containing digital data collected during the Office of Naval Research Bottom Subbottom Acoustic Reverberation Special Research Program. The data entered into the database include the acoustic data from the 1991 Acoustic Reverberation Special Research Program, the bottom bathymetry, side scan data, and seismic reflection data from the 1992 Large Scale Geophysics Cruise, the digital data collected during the 1993 Small Scale Geophysics Cruise, and the ... |
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| Method for Data Gap Compensation |
07 OCT 1997 |
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| Authors:
Francis J. O'Brien Jr.; Chung T. Nguyen; Sherry E. Hammel; Bruce J. Bates; Steven C. Nardone; DEPARTMENT OF THE NAVY WASHINGTON DC
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| The present invention comprises a method for filling in missing data intervals in a quantized time-dependent data signal that is generated by, e.g., an underwater acoustic sensing device. In accordance with one embodiment of the invention, this quantized time-dependent data signal is analyzed to determine the number and location of any intervals of missing data, i.e., gaps in the time series data signal caused by noise in the sensing equipment ... |
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| The SESAME I Experiment, Acoustic Data Processing and Catalog |
08 AUG 97 |
90 pages |
| Authors:
Christine T. Mire; L. C. Robinson; Robert L. Field; NAVAL RESEARCH LAB STENNIS SPACE CENTER MS HIGH FREQUENCY ACOUSTICS SECTION
|
| The first Shelf Edge Study Acoustic Measurement Experiment, SESAME I, was conducted August/September, 1995. The experiment took place at the Malin Shelf (56 deg 33' N, 9 deg 0' W) with the objective of determining the effects of solitary internal waves on acoustic fluctuations at the shelf edge. This paper describes the preliminary analysis of the narrow band continuous wave (CW) acoustic data from the three acoustic legs of the ... |
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| A High Performance Towed Platform for Bio-Optical, Acoustical and Physical Data Acquisition |
05 AUG 1997 |
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| Authors:
Peter H. Wiebe; Timothy K. Stanton; Tom Austin; WOODS HOLE OCEANOGRAPHIC INSTITUTION MA DEPT OF OCEAN ENGINEERING
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| We have purchased the component instruments and assembled them in a custom towed body for acquisition of high frequency acoustics data, high frame rate video data, and environmental data. The system, BIOMAPER II, operates using a fiber optic telemetry unit and a cable with 3-glass fibers at ship speeds up to 10 kts. The cable, winch, and slip rings together with a shipping van are included as part of the ... |
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| Finite Difference Modeling of Bottom Reverberation |
07 MAY 97 |
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| Authors:
Ralph A. Stephen; WOODS HOLE OCEANOGRAPHIC INSTITUTION MA
|
| Finite difference modeling was used to compare scattering from volume and interface heterogeneities at the seafloor. Two-dimensional and three- dimensional models for flat seafloors with sub-bottom heterogeneities, single facets, and statistically rough seafloors were compared. Significant secondary and tertiary scattering from rough, hard bottoms representative of basaltic seafloors was observed. The results indicate that two-dimensional techniques may be appropriate for modeling sub-bottom volume heterogeneities with velocity contrasts less than 10%. ... |
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| Continuously Logged Sediment Acoustical and Physical Properties Data, R/ V Haakon Mosby Cores, Norwegian/Greenland Sea |
18 APR 97 |
166 pages |
| Authors:
William B. Sawyer; Frederick A. Bowles; Lisa Phelps; Peter R. Vogt; Kathleen Crane; NAVAL RESEARCH LAB STENNIS SPACE CENTER MS GEOLOGY/ GEOPHYSICS SECTION
|
| Sediment cores were collected in the Greenland/Norwegian Sea for the purpose of ground-truthing previously collected sidescan imagery. This report presents the results of shore-based analyses performed on the cores. Interpretive results are not included. The unopened cores were continuously logged at 2-cm intervals for compressional-wave velocity and gamma-ray attenuation. Wet bulk density, porosity, water content, and void ratio were calculated from the attenuation measurements. Analytical results are presented in the ... |
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| Automatic Classification of Biological Sounds in the Arctic |
31 DEC 96 |
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| Authors:
Kurt M. Fristrup; WOODS HOLE OCEANOGRAPHIC INSTITUTION MA
|
| Ambient underwater recordings in the Arctic are generated by a complex mixture of physical processes and biological events. Even for experts, it is difficult and time-consuming to detect and identify biological transients. During this project, improved methods for reviewing multichannel acoustic data and promising techniques for automatic classification of biological sounds were developed. Two analytical methods demonstrated the promise of automatic recognition for these sounds. The first technique was a ... |
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| Speech Compression Using Cosine Packet Decomposition |
MAR 96 |
157 pages |
| Authors:
Joao R. Vasconcellos; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| As digitization of data becomes more prevalent, the demands on existing communications networks and computer systems to cope with this increase in data become overwhelming. Currently, the speech compression problem is handled using the CELP( Code Excited Linear Prediction) scheme and its derivatives. Such techniques are the most frequently used for speech compression at medium-to-low rate ranges. Recent research conducted into the area of cosine packets has proven this field ... |
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| Collection and Analysis of Acoustic Doppler Current Profiler Data |
JAN 96 |
68 pages |
| Authors:
W. R. Richardson; Colin R. Thorne; NOTTINGHAM UNIV (UNITED KINGDOM)
|
| Acoustic Doppler Current Profilers are presently employed by the U.S. Army in a number of projects. However, as with most new techniques there have been several problems both with the collection and the subsequent analysis of data. The main objective of this work is to improve the accuracy of Acoustic Doppler Current Profilers by examining the existing survey techniques and by developing computer software to process survey data. Two FORTRAN ... |
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| Assimilating Tomography Data into an Ocean Model |
NOV 95 |
8 pages |
| Authors:
Bruce M. Howe; James A. Mercer; UNIV OF WASHINGTON SEATTLE APPLIED PHYSICS LAB
|
| The objective of this research is to examine how assimilated acoustic tomography data constrains an open ocean quasi-geostrophic circulation model and improves model output. The primary scientific objective is to understand how line-integral measurements, such as tomographic measurements, improve the forecast skill of an ocean circulation model. In addition, we will quantify the improvement in the tomography array's spatial resolution and produce valuable qg-consistent ocean statistics for the Acoustic Mid-ocean ... |
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| Application of Data Sonification for Enhanced Interpretation of Numerical Model Results |
OCT 95 |
13 pages |
| Authors:
Julia A. Baca; ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS INFORMATION TECHNOLOG Y LAB
|
| This report describes the application of a technique known as data sonification. The technique entails creating auditory mappings for interpreting scientific data. The paper first provides background on research in the use of computer- generated audio for data interpretation. The remainder of the paper discusses a preliminary investigation in which the technique was employed to augment a scientific data visualization. The results of this investigation are reported and directions for ... |
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| MDA-1 Data Analysis and Report |
SEP 95 |
7 pages |
| Authors:
William S. Hodgkiss; SCRIPPS INSTITUTION OF OCEANOGRAPHY LA JOLLA CA MARINE PHYSICAL LAB
|
| The Marine Physical Laboratory (MPL) was involved in all aspects of the July 1991 MDA-1 experiment including experiment planning, participation in the experiment, and analysis of the resulting data. Analysis of the data collected during MDA-1 began in FY92. MPL activities related to this analysis included distribution of the MDA-1 data, quick-look characterization of the data quality, localization of the MDA-1 array elements throughout the experiment and ambient noise analysis. ... |
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| Event-Driven Signal Processor Interface Having Multiple Paralleled Microprocessor-Controlled Data Processors for Accurately Receiving, Timing and Serially Retransmitting Asynchronous Data with Quickly Variable Data Rates. |
07 MAR 1995 |
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| Authors:
Victor A. Andersen; James D. Perry; DEPARTMENT OF THE ARMY WASHINGTON DC
|
| A hydrophone analog signal data acquisition, A/D conversion and data transmission system includes a first-stage signal processing subsystem which provides digital representations of the hydrophone analog signal which in turn are signal processed for transmission in the form of data packets by a second-stage signal pro- cessing subsystem (40). Subsystem (40) includes a plurality of signal processing units (48) having inputs ... |
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| Preliminary Estimates of Low-Frequency Sound Effect on Sea Animals in the Eastern Arctic |
08 SEP 94 |
88 pages |
| Authors:
V. M. BelKovich; N. G. Bibikov; N. A. Dubrovsky; M. N. Suhoruchenko; V. A. Zhuravlev; SCIENCE APPLICATIONS INTERNATIONAL CORPSAN DIEGO CA
|
| For many years, the economic exploitation of the Arctic was confined to fishery and aquatic mammals hunting. Such activities being performed by all coastal countries lead to a considerable decrease in number of all kinds of fish and whales. Even the supplies of the regional basic fish species were depleted. This caused a serious disbalance of the ecological system: the number of bird's colonies was decreased, the food supplies of ... |
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| West Florida Shelf Environment for the Area Characterization Test I (ACT I) |
08 JUL 94 |
90 pages |
| Authors:
B. R. Gomes; J. E. Matthews; NAVAL RESEARCH LAB STENNIS SPACE CENTER MS
|
| During 18 through 27 September 1992, a carefully controlled acoustic exercise, Area Characterization Test 1 (ACT 1) was conducted in the shallow- water West Florida Shelf area known as Florida Middle Ground under the auspices of the Undersea Warfare Office of the Advanced Research Projects Agency. The goal is to develop an acoustic detection capability in adverse ocean environments such as shallow-water areas of continental shelves. To accomplish this, environmental ... |
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| Coastal Acoustic Tomography Data Constraints Applied to a Coastal Ocean Circulation Model |
APR 94 |
92 pages |
| Authors:
Le N. Ly; Ching-Sang Chiu; NAVAL POSTGRADUATE SCHOOL MONTEREY CA DEPT OF OCEANOGRAPHY
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| A direct insertion scheme for assimilating coastal acoustic tomographic (CAT) vertical temperature sections into a multilevel, coastal primitive equation model for the Gulf of Sirte (Lybia) is investigated using computer simulation experiments. Although the model was developed for the whole Mediterranean Sea (MED), only a model sub-domain covering the Gulf of Sirte was used in this study. The model has realistic coastlines and bottom topography, and a coastal-following, curvilinear, nearly ... |
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| Expert Maintenance Advisor Development for Navy Shipboard Systems |
1994 |
13 pages |
| Authors:
Portia J. Harris; Robert S. Romalewski; NAVAL RESEARCH LAB STENNIS SPACE CENTER MS
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| In the Navy's search to find a more cost-effective maintenance tool, the Naval Research Laboratory at Stennis Space Center, Mississippi developed an Expert Maintenance Advisor for the AN/USH-32(V) Signal Data Recorder-Reproducer Set. This analog tape recorder system is a high performance acoustic data recorder/reproducer set used in data acquisition and data processing. Its maintenance is complicated by multiple adjustments, their relationships, and lengthy calibration and checkout procedures. The Expert Maintenance ... |
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