| An Operator Perspective on Net-Centric Underwater Warfare |
12 JUL 2007 |
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| Authors:
Garfield R. Mellema; DEFENCE RESEARCH AND DEVELOPMENT ATLANTIC DARTMOUTH (CANADA)
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 | In March 2007, the Networked Underwater Warfare Technology Demonstration Project at Defence R&D Canada - Atlantic conducted an at-sea antisubmarine trial utilizing Net-centric Warfare (NCW) constructs to demonstrate improved technologies for underwater warfare. User feedback was solicited during and after the trial for the purpose of documenting the manner in which the systems were used during the trial and gaining insight into their potential future usage in NCW activities. This ... |
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| Detection Performance Prediction Model for a Generic Anti-Submarine Warfare Radar Mode |
FEB 2001 |
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| Authors:
Irina Antipov; John Baldwinson; DEFENCE SCIENCE AND TECHNOLOGY ORGANISATION SALISBURY (AUSTRALIA) ELECTRONICS AND SURVEILLANCE RESEARCH
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| This report describes the design and implementation of a detection performance prediction model that has been developed for a generic Anti- Submarine Warfare mode of a maritime surveillance radar system. The model provides a map of the predicted average probabilities of detection as a function of range and look direction compared to the wind/swell direction for a user defined target in user defined operational and environmental conditions. |
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| Survey of Ship Tracks Observed by NOAA AVHRR |
09 JUL 1998 |
4 pages |
| Authors:
James A. Coakley Jr; OREGON STATE UNIV CORVALLIS COLL OF OCEANIC AND ATMOSPHERIC SCIENCES
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 | High resolution, multispectral satellite imagery data from morning and afternoon satellite passes ver the coast of California during June 1994 were analyzed to determine the altitudes, visible optical depths, and cloud droplet effective radii for low-level clouds. Comparisons were made between the properties of clouds within 50 km of the tracks left by underlying ships in the clouds and those farther han 200 km from the tracks in order to ... |
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| Optimal Deployment Angles for the Air-Dropped Undersea Warfare Cable in Shallow Water |
MAR 1994 |
56 pages |
| Authors:
Fanourios P. Diamandopoulos; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
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| The Advanced Air Deployable Array (AdDA) is an air-dropped undersea warfare device for detection of an enemy submarine in the shallow waters region. Previous studies have introduced six tactical deployment methods by C-130 aircraft. This thesis addresses one of the methods, called Bound the Expanding Farthest-On Circle. Changes in deployment rules are suggested, and feasibility conditions identified. A model is developed showing how the isolation area where the submarine is ... |
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| Assessment of Atmospheric Influence on Surveillance Radar Performance in Littoral Zones |
SEP 93 |
87 pages |
| Authors:
Kyle M. Craigie; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
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| Acoustic sensors, traditionally thought of as the mainstay of modem ASW's means of detection and localization, are rapidly becoming secondary in the littoral zones to active sensors such as radar. The coastal region has a dynamic meteorological environment dominated by surface and near-surface ducts which influence sea clutter. Accurate, timely description of the effects this changing environment has on sensor performance is mandatory for the ASW tactitician to utilize his ... |
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| The Resonant Interaction of a Submarine's Wake with a Stratified Fluid |
JUN 93 |
72 pages |
| Authors:
Joseph A. Kowalewski; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
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| Through the use of asymptotic and perturbation methods, this thesis presents a theoretical study of the flow of a stratified fluid over variable topography as a model of the resonant interaction of a submarine's wake with a stratified fluid. Such resonant interactions may be able to produce significant upstream disturbances. The long time solution obtained in our model exhibits growth in time for the resonant case, indicating that perhaps nonlinear ... |
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| Submarine Internal Waves |
JAN 93 |
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| Authors:
E. O. Tuck; MATERIALS RESEARCH LABS ASCOT VALE (AUSTRALIA)
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| Details are provided of research directed towards the development of the computer program WAKE for predicting the internal waves produced by the passage of a submarine in a density stratified ocean. The research was undertaken within DSTO during the period February-March 1992. The report takes the form of a series of appendices (presented in chronological order), which provide a record of the progress of the research during that period. Results ... |
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| Navy Research: Status of Programs in Nonacoustic Antisubmarine Warfare Research |
OCT 91 |
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| Authors:
GENERAL ACCOUNTING OFFICE WASHINGTON DC NATIONAL SECURITY AND INTERNATIONAL A FFAIRS DIV
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| As part of our continuing work on Navy issues, we conducted a review of nonacoustic antisubmarine warfare research programs. Noting significant congressional interest in these programs in recent years, we compiled information on past and present developments to assist committees in this year's nonacoustic-ASW budget deliberations. Specifically, we gathered information from program participants and other informed sources on the key issues affecting whether the Navy should be given control over ... |
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| Synthesis and Characterization of Gallium-Arsenic Compounds Containing a Four-Membered Ga-As-Ga-Cl or Ga-AS-Ga-As Ring: Crystal Structures of (Me3SiCH2) 2GaAs(SiMe3)2)2 |
30 OCT 90 |
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| Authors:
Richard L. Wells; James W. Pasterczyk; Andrew T. McPhail; James D. Johnson; Abbas Alvanipour; DUKE UNIV DURHAM NC DEPT OF CHEMISTRY
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| The third example of an organogallium four-membered ring compound with arsenic, halogen mixed bridging, (Me3SiCH2)2GaAs(SiMe3)2Ga(CH2SiMe3)2CI, was prepared by the reaction of (Me3Si)3As with two equivalents of (Me3SiCH2) 2GaC1. X-ray crystallographic analysis showed that the compound contains a nonplanar Ga-As-Ga-C1 ring. The crystals belong to the monoclinic system space group P21/c (C52h) with four molecules per unit cell of dimensions a 12.476, b 15.832, c22.279 A, Beta 108.87, V 4164(2) A3. ... |
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| Coding Gains for Rank Decoding |
FEB 90 |
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| Authors:
A. B. Cooper III; ARMY BALLISTIC RESEARCH LAB ABERDEEN PROVING GROUND MD
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| It is well-known that the use of channel state information can improve decoding reliability. This is because estimates of channel noise can be used to help identify which received symbols are most likely to be in error. Any technique which uses channel noise information to improve decoding is called a soft decision decoding algorithm. Discarding channel state information in the decoding process requires an increase in the transmitter power required ... |
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| Polarization Matrices of Lithium Tetraborate |
JUN 89 |
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| Authors:
Arthur Ballato; ARMY LAB COMMAND FORT MONMOUTH NJ ELECTRONICS TECHNOLOGY AND DEVICES LAB
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| In analytical treatments of piezoelectric-acoustic transducers, signal processors, and resonators, the electrochemical transduction mechanism is most often expressed in terms of the elements of the piezoelectric (e) or (d) matrices. Molecular interpretations of piezoelectricity, and especially electrooptical applications, usually involve polarization as the preferred variable, and consequently the alternative (a) and (b) matrices are of interest. The elements of these latter sets are calculated for lithium tetraborate from measured elastopiezodielectric ... |
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| Reactive Atmosphere Processing of BaTiO(3) and Origins of Its Photorefractive Effect |
APR 89 |
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| Authors:
M. B. Klein; B. A. Wechsler; HUGHES RESEARCH LABS MALIBU CA
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| Photorefractive materials offer great promise for applications in optical data processing and phase conjugation using degenerate four-wave mixing. BaTiO3 is a particularly promising material, primarily because the very large value of the electro-optic tensor component r42 yields correspondingly large values of grating efficiency, beam coupling gain, and four-wave mixing reflectivity. Unfortunately, the commercial availability of BaTiO3 crystals is limited, and samples which are available are relatively small and impure and ... |
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| Canadian and U.S. Defense Planning toward the Arctic |
APR 89 |
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| Authors:
Suzanne Holroyd; RAND CORP SANTA MONICA CA
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| A Program to Compute Electric Anomaly Detection Probabilities |
OCT 88 |
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| Authors:
R. N. Forrest; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
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| The report contains user instructions, a listing and documentation for a microcomputer BASIC program that can be used to compute an estimate of the probability that an electrometer based electric anomaly detection (EAD) system will detect a submarine during an encounter. Keywords: Electric anomaly detection, Lateral range function, Detection models, and Electric dipole. (RH) |
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| Photoinduced Self-Localized Structural Distortions in YBa2Cu3O7-delta: Direct Evidence of Polarons or Bipolarons |
MAY 88 |
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| Authors:
Y. H. Kim; C. F. Foster; A. J. Heeger; S. Cox; G. Stucky; CALIFORNIA UNIV SANTA BARBARA DEPT OF CHEMISTRY
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| Photoinduced infrared absorption measurements of YBa2Cu307-delta (delta=0.75) in the spectral region from 150/cm to 4000 cm are reported. We observed photoinduced infrared active vibrations (IRAV) modes, associated phonon bleachings, and an electronic transition (from a localized gap state) peaked at 1050/cm (0.13 eV). The spectral features indicate a local tetragonal to orthorhombic distortion in the Cu-O plane around the photoinduced charge carriers in YBa2Cu307-delta is smaller than La2CuO4. The photoinduced ... |
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| Growth of GaAs Crystals by the Heat Exchanger Method (HEM) for Microwave Device Applications |
MAR 88 |
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| Authors:
Chandra P. Khattak; Frederick Schmid; CRYSTAL SYSTEMS INC SALEM MA
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| Large GaAs crystals with uniform properties and low defect density are required for microwave devices. The variable quality of the available GaAs, wafer-to-wafer, intra-wafer, boule-to-boule, and intra-boule is unsatisfactory for high yield device processing. It has been shown that undoped (100) semi- insulating GaAs crystals can be grown using the Heat Exchanger Method (HEMTM) with remarkably uniform electronic properties. It has also been demonstrated that undoped dislocation free GaAs crystals ... |
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| Thermal Macrowake of Surface Ships |
FEB 88 |
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| Authors:
Peter O. Cervenka; DAVID TAYLOR RESEARCH CENTER BETHESDA MD
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| A theoretical scheme to describe the infrared scar left by a surface ship on a body of water is presented. Starting from a field velocity distribution behind the vessel, the fluid mechanical behavior of the disturbance is developed as it interacts with the vertical thermal profile of the water and produces a temperature pattern on the sea surface. As a result, the signal sensed by a remote detection system is ... |
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| Improvements in Techniques of Microwave Thermography |
11 JUN 85 |
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| Authors:
Alan H. Barrett; MASSACHUSETTS INST OF TECH CAMBRIDGE RESEARCH LAB OF ELECTRONICS
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| During the period 15 November 1983 to 15 November 1984 our efforts have focussed on (1) modifying our 3 and 6 GHz radiometers for reflection compensation and making design changes to improve the stability, (2) designing antennas to give improved penetration depth, and (3) bistatic measurements whereby the scattered radiation from an embedded object is determined to provide information on the size of the object and the proper frequency for ... |
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Non-acoustic and Non-magnetic Sub Detection
