Browsing Technical Reports by Title
Now showing items 1-20 of 322
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A classification technique combining aspect dependence and elastic properties of target scattering
(NATO. SACLANTCEN, 1999/04)Discrimination between man-made and natural underwater objects and between man-made objects of different characteristics are the key objectives of target classication. The current approach is mainly based on the analysis ... -
A collection of analytical results related to the ASW protection of convoys and carriers
(NATO. SACLANTCEN, 1987/07)This paper is a collection of diverse analytical results that are related to several aspects of a common problem: the defence of carriers against torpedo-firing submarines. This work is not in any sense a complete treatment ... -
A compact buoy system for ship-use in the measurement of ocean micro-structures over a monthly period
(NATO. SACLANTCEN, 1966/10)The oceanographic buoy described is for ship use. It allows a single ship to make synoptic studies of a limited body of water using a number of buoys. The purpose was to create an economic, simple, dependable sea unit, ... -
A compact thermometer for the study of microthermal structure from oceanographic buoys
(NATO. SACLANTCEN, 1965/10)A solid-state, thermistor thermometer, of small physical size (13 cm x 14 cm), low cost ($21.00 worth of parts), and long-term stability (of the order of 0.01 C in 60 days) is described. It has been used successfully - in ... -
A detailed study of sound reflections from a layered ocean bottom
(NATO. SACLANTCEN, 1965/05)The effect of layered sediments on sound reflection from the ocean bottom has been investigated theoretically and experimentally. Very detailed, systematic and computer-aided calculations of the reflection coefficient of ... -
A digital depth recorder
(NATO. SACLANTCEN, 1966/11)The depth recorder described has been designed for the direct computer processing of data, which it provides in digital form on perforated tape. It is intended as a supplement to the Precision Depth Recorder installed on ... -
A digital recording system for LORAN-C
(NATO. SACLANTCEN, 1967/04)A method for digitally recording the readings of a Collins LORAN-C Mk LR 101 Receiver on punched paper tape is described. The various advantages of automatically recording LORAN-C data are examined and it is shown how, ... -
A high resolution seismic sequence analysis of the Malta Plateau
(NATO. SACLANTCEN, 1999/05)A high resolution seismic study of the Malta Plateau was conducted to characterize the Quaternary sediment layers, mapping their regional extent and determining the environmental conditions during their deposition. Seismic ... -
A mechanical model for estimating the motion of low altitude satellites with respect to the Earth's surface
(NATO. SACLANTCEN, 1965/08)The principles and design of a mechanical model used for demonstrating or approximately estimating the motion of low altitude satellites with respect to the earth's surface are described. -
A method for determining absolute velocities from hydrographic data
(NATO. SACLANTCEN, 1987/07)This study describes a procedure for deriving the characteristics of large-scale climatic currents from -
A method for determining absolute velocities from hydrographic data: the numerical code
(NATO. SACLANTCEN, 1988/02)The numerical procedure associated with the inverse method of Peggion (1987) is described. The model equations are formulated on a spherical-shell coordinate system. The method is applied to a limited area of the basin of ... -
A method for the three-dimensional reconstruction of underwater objects
(NATO. SACLANTCEN, 1996/10)This report describes a method to estimate the three-dimensional aspects of underwater objects using a sequence of sonar images. The data are recorded by a sector scanning sonar, carried by an underwater vehicle which ... -
A method to quantify shortfalls and cost benefits for the MO 2015 ASW advanced concepts study
(NATO. SACLANTCEN, 1997/06)An ASW Advanced Concepts Study (ACS) has been initiated as part of Phase 2 of NATO Study, "Implications of New Technology for Maritime Operations in 2015". In this paper, a method to assess ASW search operations is described ... -
A microcomputer-controlled digital acquisition and analysis system for the expendable bathythermograph
(NATO. SACLANTCEN, 1985/10)For a number of years the expendable bathythermograph (XBT) has been an important tool for basic and applied oceanographic survey work. This has led to a significant body of work being done on the accuracy of the XBT system ... -
A neural-network-fusion architecture for automatic extraction of oceanographic features from satellite remote sensing imagery
(NATO. SACLANTCEN, 1999/06)This report describes an approach for automatic feature detection from fusion of remote sensing imagery using a combination of neural network architecture and the Dempster-Shafer (DS) theory of -
A note on attenuation and dispersion in marine sediments
(NATO. SACLANTCEN, 1989/04)From the more recent investigations reported ill the literature, -
A note on convergent zones
(NATO. SACLANTCEN, 1962/02)An exact solution for ray paths near a sound channel with parabolic velocity profile is given for rays crossing the sound channel axis at small angles. The convergent zone for such rays for a source on axis is compared ... -
A parametric synthetic aperure sonar for detection of proud and buried mines
(NATO. SACLANTCEN, 1997/12)This paper describes an experimental comparison between a parametric sonar and a conventional sonar for the detection of small objects on and in, the sea bed. Two experiments were performed in France (GESMA site) in October ... -
A plane-wave decomposition method for modeling scattering from objects and bathymetry in a waveguide
(NATO. SACLANTCEN, 1996/11)In this paper a straightforward plane-wave decomposition method which can be used for solving object andlor interface scattering problems in a waveguide is described. The method utilizes the free-space scattering matrix ... -
A review of the application of UUV technology to mine countermeasures
(NATO. SACLANTCEN, 1999/03)The emphasis on littoral warfare, the proliferation of low cost mines available to potentially hostile countries, high exercise costs and risks related to the operation of present NATO MCM units, require the development ...
