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Now showing items 156-175 of 882
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Array performance and variability at short range near Vestfjorden
(NATO. SACLANTCEN, 1993/08)An experiment was conducted in October 1989 in shallow water near Vestfjorden in support of low frequency active sonar system research at SACLANTCEN. This report addresses some acoustic measurement results from that test ... -
Array shape determination with a real-time model
(NATO. SACLANTCEN, 1993/08)A shape estimation scheme based on precomputed frequency-domain solutions of array motion is presented. The boundary conditions supporting each solution are discrete Fourier transform (OFT) components of sensor measurements, ... -
Arrays and array processors: future real time applications in oceanography and sonar
(NATO. SACLANTCEN, 1979/12)In the last several years oceanographic applications of arrays have increased substantially. The spatial resolution and redundancy provided by arrays have been necessary in the interpretation of signal propagation in complex ... -
Assessment of sea wave spectra using a surfaced glider
(CMRE, 2019/06)The determination of non-directional and directional sea wave spectra is attempted by analysing the dynamical response of a surfaced Slocum glider. The method makes use of the glider heave motion to infer non-directional ... -
Assessment techniques for computer models of sound propagation
(NATO. SACLANTCEN, 1975/10)Computer models of sound propagation have exactly three drawbacks: the model only approximates reality,the computer program only approximates the model, and the cost approximates infinity. The only way to assess these ... -
Assimilation of hydrographic data from the Atlantic inflow experiment into ocean models
(NATO. SACLANTCEN, 1989/10)This study represents the link between observational and numerical programs. A method for data -
At-sea measurements of acoustic elastic scattering by a 1.5m-long cylinder made of composite materials
(NURC, 2007/12)Monostatic and bistatic acoustic scattering measurements were performed on solid-filled fibreglass objects (a sphere and a cylinder with hemispherical endcaps) deployed proud on a sandy seabed and insonified by a rail-mounted ... -
At-sea measurements of diver target strengths at 100 Khz: measurement technique and first results
(NURC, 2006/08)During a recent at-sea trial of a diver detection system, the opportunity was taken of developing a technique for in-situ measurement of diver target strengths. The technique was based on making the diver perform circular ... -
Atlantic inflow experiment GIN Sea Cruise'87 datareport: Part I: Tydeman hydrography: volume 1
(NATO. SACLANTCEN, 1991/12)The hydrographic data from the GIN 87-T cruise on board the HNLMS Tydeman are summarised in this data report. This cruise constituted the first cruise of the 1987 portion of the Atlantic Inflow Experiment, -
Atlantic inflow experiment GIN Sea Cruise'87 datareport: Part I: Tydeman hydrography: volume 2
(NATO. SACLANTCEN, 1991/12) -
Atlantic inflow experiment GIN Sea Cruise'87: Data report Part II: Circulation (Faeroe Channel)
(NATO. SACLANTCEN, 1991/12)This data report summarizes results of the Atlantic Inflow Experiment, -
Atlantic inflow experiment, GIN Sea Cruise'86: Data report Part II: circulation
(NATO. SACLANTCEN, 1990/03)As the initial field effort of the Atlantic Inflow Experiment, three instrumented moorings were deployed in the Faeroe-Shetland Channel during June 1986. The purpose of the array was to monitor the inflow, and to tract the ... -
Atlantic inflow experiment, GIN Sea cruise'86: Data report: Part I: Hydrography + (Appendixes B and C)
(NATO. SACLANTCEN, 1988/06)An investigation of the inflow of North Atlantic surface water into the Greenland-Norwegian-Iceland -
Attenuation of shear waves in near-surface sediments
(NATO. SACLANTCEN, 1997)In situ measurement of compressional and shear speed and compressional attenuation in near-surface marine sediments is a well-developed technology but techniques required to measure shear attenuation have lagged behind. ... -
Autofocusing a synthetic aperture sonar using the temporal and spatial coherence of seafloor reverberation
(NATO. SACLANTCEN, 1997)An autofocusing algorithm for the compensation of translational motion errors of a sea floor rmaging synthetic aperture side scan sonar is presented. The algorithm does not depend on the presence or absence of dominant ... -
Automated port traffic statistics: from raw data to visualization
(CMRE, 2017/11)We describe how we leveraged best practices in big data processing pipeline design and visual analytics to prototype the Maritime Patterns-of-Life Information Service (MPoLIS), an information product currently under ... -
Automatic change detection for the monitoring of cluttered underwater areas
(NURC, 2008/09)Automating the surveillance of cluttered underwater areas (such as ports) poses several problems, the main one being the high number of contacts that any automatic target recognition (ATR) system will produce when surveying ... -
Automatic picture transmission receivers for weather satellite images: a brief introduction and survey of some commercially-available equipment
(NATO. SACLANTCEN, 1986/06)The Automatic Picture Transmission (APT) signal is broadcast from several polar-orbiting weather -
Automatic target classification using multiple sidescan sonar images of different orientations
(NATO. SACLANTCEN, 1997/09)In this report, the target classification performance of a multiple view sidescan sonar is investigated. The classification statistics are estimated using model based automatic classifiers. The guidelines to the design of ... -
Autonomous networked anti-submarine warfare research and development at CMRE
(CMRE, 2019/06)CMRE has been evaluating the potential of autonomous networked ASW using underwater vehicles through a program of sonar signal processing, underwater communications, navigation and robotic behavior developments and at-sea ...