Technical Reports: Recent submissions
Now showing items 281-300 of 322
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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 -
Sediment shear waves: a comparison of in situ and laboratory measurements
(NATO. SACLANTCEN, 1989/03)Surficial sediment shear wave velocity measurements were made at eight sites (water depths 7-22 m) -
Estimators for model-based passive localization
(NATO. SACLANTCEN, 1988/07)A comparative study is made of the performance of four different estimators as used in the matched field technique of passive localization. The study is based on both real and synthesized data. In the synthesized data case, ... -
MAKE-MAP and MEDMAP: two programs for plotting maps of the Mediterranean Sea
(NATO. SACLANTCEN, 1988/06)Two FORTRAN programs MAKE_MAP and MEDMAP are described which, when used together, will plot maps of all or any portion of the Mediterranean Sea. Examples are given which show the high degree of detail provided by the 2' ... -
Detection of narrow-band low-level signals: simulated performance of high-resolution eigenstructure methods versus conventional beamforming
(NATO. SACLANTCEN, 1988/08)In this report the detection of narrow-band low-level signals by passive sonar is addressed, -
Qualitative aspects of seismograph-ocean bottom interaction
(NATO. SACLANTCEN, 1988/06)The parameters affecting the coupling of the Ocean Bottom Seismometer to the ground have been -
Deconvolution by homomorphic and Wiener filtering
(NATO. SACLANTCEN, 1988/09)This study is concerned with deconvolution methods applied to underwater propagation in shallow -
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 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 ... -
The application of coupled-mode theory to propagation in shallow water with randomly varying sound speed
(NATO. SACLANTCEN, 1987/06)Sound propagation in the Baltic Sea cannot be described correctly by range independent propagation -
Testing finite differencing schemes for the shallow water equations
(NATO. SACLANTCEN, 1987/10)The explicit, the semi-implicit, and the fractional step schemes are tested and compared in the -
Bispectrum of ship-radiated noise
(NATO. SACLANTCEN, 1988/07)The bispectrum of ship radiated noise is estimated. The noise was received on a towed array being towed by the same ship that served as the noise source. The array was beamformed such that the forward endfire beam pointed ... -
Deep water mass circulation in the Alboran basin: measurements - January to April '82 ALBORAN II
(NATO. SACLANTCEN, 1987/09)Alboran Sea circulation between 220 m and 1100 m depth is studied. Interaction between three water types, Atlantic water, Levantine water, and western Mediterranean Deep water cause a complicated flow pattern. Atlantic ... -
Deep water mass circulation in the Alboran Basin: Measurements - August to November'83: ALBORAN III
(NATO. SACLANTCEN, 1988/02)The circulation of the deep water mass in the western Alboran Sea is studied. Interaction between the -
Oceanographic data from the southern Tyrrhenian Sea: August to October 1984: Part 1 - Floats and moored instruments: Part 2 - Hydrography
(NATO. SACLANTCEN, 1988/02)A SACLANTCEN observational programme in the Southern Tyrrhenian Sea comprised a sequence of three cruises during the period August to November 1984. The primary purpose was to investigate the late summer water-mass variability ... -
Target motion effects on passive sonar: an appraisal of basic factors
(NATO. SACLANTCEN, 1986/12)Detection and tracking by passive sonar involve the observation of the target-radiated noise in bearing-cells and time-cells that have their dimensions predetermined by a combination of physical limitations, e.g. the size ... -
Measurements of correlation loss and time-spreading in linear FM sweeps and pseudo-random noise signals transmitted over long ranges in shallow water
(NATO. SACLANTCEN, 1986/12)The results of some transmission measurements made in shallow water are described. The ranges were about 15 km, 20 km, and 34 km, and the sound source was either suspended about 10 m above the bottom or was on the bottom ... -
Wave theory modelling of convergence zone propagation in the ocean
(NATO. SACLANTCEN, 1987/06)Improved numerical techniques together with continual advances in computer technology have now -
The determination of permeability in in-situ marine-floor sediments
(NATO. SACLANTCEN, 1985/11)A method of evaluating in situ permeability of unconsolidated marine floor sediments has been -
The influence of fluctuations in acoustic travel time on locating the position of an underwater sound source
(NATO. SACLANTCEN, 1985/10)This paper investigates the accuracy of an underwater acoustic positioning system in locating a sound source that transmits at unknown times in conditions in which the acoustic travel times between