Reprints: Recent submissions
Now showing items 261-280 of 548
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Autonomous underwater vehicles for port protection
(NURC, 2006/07)NATO's present capability to deal with a terrorist threat to our ports is slow, dangerous, and inefficient. Ports are a challenging area within which to conduct MCM operations due to several factors: shipping movements, ... -
The structure of fronts in the seasonal thermocline
(NATO. SACLANTCEN, 1972/09)Some years ago, when the first continuous profiling temperaturesalinity- depth probes came available it was discovered that tht thermocline had a layered structure. The thickness of these layers was a few metres and ... -
Multi-waveform active sonar tracking
(NURC, 2007/06)This paper extends the NURC distributed multihypothesis -
Multipath pulse shapes in shallow water: theory and simulation
(NURC, 2007/04)In shallow water propagation the steeper ray angles are weakened most by boundary losses. Regarding the sound intensity as a continuous function of angle it can be converted into a function of travel time to reveal the ... -
Separability of seabed reflection and scattering properties in reverberation inversion
(NURC, 2007/02)Separation of scattering properties (Lambert's mu) from reflection properties (the reflection loss angle derivative alpha) presents difficulties in the geoacoustic inversion of long range reverberation in isovelocity ... -
A deep stepped thermohaline structure deep in the Mediterranean
(NATO. SACLANTCEN, 1972/09)A deep stepped thermohaline structure has been observed in the Tyrrhenian Sea below the Levant ine water salinity maximum. The layers are remarkably homogeneous starting with a thickness of 10 m - 20 m at 600 m and thereafter ... -
Intermediate water downstream of the Strait of Sicily
(NATO. SACLANTCEN, 1972/09)In July 1970 the ATLANTIS II sailed through the western Mediterranean providing an opportunity to make a quasi-synoptic observation of the Levantine Intermediate Water between the Strait of Gibraltar and the Strait of ... -
Methods used in France for the calculation of sound fields
(NATO. SACLANTCEN, 1971/12) -
The Levantine intermediate water mass from Sardinia to Rhodes
(NATO. SACLANTCEN, 1972/09) -
Some statistical characteristics of ocean motions from current measurements
(NATO. SACLANTCEN, 1972/09)A rotary-component method for analysing vector series in two dimensions was developed for the study of the coupling between wind-stress and surface current [Gonella, 1972J. This method provides a good tool for instrumental ... -
Preliminary results of current measurements in the Strait of Sicily in May 1970
(NATO. SACLANTCEN, 1972/09)During May 1970, series of oceanographic observations were made in the Strait of Sicily in support of MILOCMED. Sections of hydrologic stations were made using temperature salinity recorder (TDS) and Nansen bottles by R/ ... -
A contribution to the hydrology of the Strait of Sicily
(NATO. SACLANTCEN, 1972/09)The Osservatorio Geofisico Sperimentale of Trieste made a series of hydrological measurements in the Mediterranean in 1968. The areas concerned were the Gulf of Taranto, the Tyrrhenean Sea and the Western Basin. At. the ... -
A summary of oceanographic data obtained in deep water in the Strait of Sicily in May 1970: MILOCMED surv 70
(NATO. SACLANTCEN, 1972/09)Observations of temperature and salinity using a TSD profiling system were made down to 500 m in a deep water area southeast of Pantelleria Island in the Strait of Sicily in May, 1970. The usual two layer system was observed, ... -
A study of the turbulent flow and character of the water masses over the Sicilian ridge in both summer and winter
(NATO. SACLANTCEN, 1972/09)The western sill region of the Strait of Sicily lies between Sicily (Capo Lilibeo) and Tunisia (Cap Bon) and is part of the submarine ridge separating the eastern from the western Mediterranean. [Fig. lJ. It was studied ... -
On the physics and design of electrical discharge sources for active undersea surveillance
(NATO. SACLANTCEN, 1993/08)Underwater electrical arcs have long been used as an impulsive sound source, although efforts to improve efficiency and control acoustic output have been limited by inadequate understanding of the arc initiation process. ... -
Array and cable tracking data through ship maneuvers
(NATO. SACLANTCEN, 1993/08)This paper presents tracking results from two sea tests in which a towed cable and array were tracked at the Atlantic Undersea Test and Evaluation Center (AUTEC). The tracking tests involved instrumenting the cable with ... -
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, ... -
Practical active sonar receiver systems using fast frequency-domain correlation
(NATO. SACLANTCEN, 1993/08) -
Performance assessment of broadband impulsive noise jammers
(NATO. SACLANTCEN, 1993/08)A noise jammer raises the noise level observed by a threat sonar to degrade the sonar's detection performance. In this paper we assess the potential for a specific noise jammer waveform used to countermeasure low frequency ... -
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 ...