Browsing by Title
Now showing items 800-819 of 882
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The hydrological characteristics of the waters exchanged between the eastern and the western basins of the Mediterranean
(NATO. SACLANTCEN, 1972/09)An analysis is done of hydrographic data obtained in 1965 and 1966 in the region of Tunis-Sicily-Malta. Vertical sections permit to follow the opposite spreadings of the surface water of Atlantic origin and the levantine ... -
The influence of a low velocity layer on the reflectivity from the sea floor
(NATO. SACLANTCEN, 1966/05)The influence on the reflectivity of a low velocity layer on top of a sand half-space has been investigated. By expressing sediment density and velocity in terms of porosity it has been possible to use this quantity as an ... -
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 -
The influence of quantizing and sampling on the signal-to-noise ratio of a complex correlator
(NATO. SACLANTCEN, 1967/09)The combined effects of sampling and phase-quantizing of phase- modulated signals in Gaussian noise are studied and expressed in terms of the output signal-to-noise ratio of a matched filter correlator. The obtained results ... -
The intrinsic variability of detection range and its implications
(NURC, 2009/12)The range of first detection of an approaching target is among the most important parameters defining sensors and defensive surveillance systems. A demonstration of capability typically consists of staged approaches of a ... -
The joint SACLANTCEN/USA towed vertically directive source - TVDS
(NATO. SACLANTCEN, 1996/07)This report is the text of a paper presented at Undersea Defence Technology, Cannes, 1995 (UDT 95). It outlines the development of the Towed Vertically Directive Source (TVDS) and the associated ship-handling and winching ... -
The KRAKEN normal mode program
(NATO. SACLANTCEN, 1991/09)In the late 1970's several normal-mode models existed which were -
The Levantine intermediate water mass from Sardinia to Rhodes
(NATO. SACLANTCEN, 1972/09) -
The magnetic dipole moment of RV Alliance
(NATO. SACLANTCEN, 1999/02)A SACLANTCEN magnetometry sea trial was performed in September 1998 in the northern Tyrrhenian Sea in the vicinity of the Formiche di Grosseto islands. One of the trial objectives -
The Maltese oceanic front: a surface description by ship and aircraft
(NATO. SACLANTCEN, 1972/09)Simultaneous observations by ship and aircraft of an oceanic fronta ! zone east of Malta in May 1971 show a predominatly north-south boundary between two water masses evidently formed by surface water from the western ... -
The MPS-3 and the SPS-81
(NATO. SACLANTCEN, 1979/12)The Larqe Aperture Acoustics Branch of the Naval Research Laboratory has developed a sea-qoinq signal processinq system in which two different types of array processors are used - a Signal Processing Systems SPS-81 and ... -
The Ninth International Conference on Information Fusion (Fusion 2006) final conference report
(NURC, 2006/10)The 9th International Conference on Information Fusion (FUSION 2006) was held on 10-13 July 2006 in Florence, Italy. The FUSION conference series serves as the annual gathering and -
The ocean wave dynamo: a source of magnetic ambient noise
(NATO. SACLANTCEN, 1997/09)The electromagnetic dynamo field of sea surface waves, a consequence of the Lorentz force, has been measured with two simultaneously operating, closely spaced tri-axial magnetometers. Measurements from a magnetometer located ... -
The optimum frequency of propagation in shallow-water environments
(NATO. SACLANTCEN, 1983/04)The optimum frequency of propagation in shallow water environments is the result of competing propagation and attenuation mechanisms at high and low frequencies. It is shown that the optimum frequency is strongly dependent ... -
The prediction of temporal statistics of directional ambient shipping noise
(NATO. SACLANTCEN, 1982/06)A technique for predicting the probability density function (PDF) of the ambient-noise power received by a narrow-band system in a modelled shipping and wind noise field is described. The densities of the shipping noise ... -
The propagation and reception of transient electromagnetic signals in the presence of a conducting half-space
(NATO. SACLANTCEN, 1961/05)In this paper a theoretical treatment is given of the short-distance propagation and reception of a step-function in the presence of a conducting half-space. The step-function is generated by a horizontal electric dipole ... -
The relation between the waveguide invariant, multipath impulse response, and ray cycles
(NURC, 2012/04)The waveguide invariant, b, that manifests itself as interference fringes or "striations" in a plot of frequency vs source-receiver separation, is usually thought of as a modal phenomenon. This paper shows that striations ... -
The Response model: an operational model for towed array shape and attitude estimation validated on TABAT data
(NATO. SACLANTCEN, 1993/08)An operational model for array shape and attitude estimation, based on the continuous measurement of heading and depth at a single position in the array, is presented. This model, which we call the Response model has been ... -
The reverberation of sound from smooth ocean floors
(NATO. SACLANTCEN, 1963/02)The reverberations produced by a completely flat surface separating two homogeneous isotropic fluids is investigated. There is no effort to include the effect of rough surfaces which would be a logical extension of the ...