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Wednesday, August 12, 2020 | History

1 edition of Transverse horizontal coherence and low-frequency array gain limits in the deep ocean found in the catalog.

Transverse horizontal coherence and low-frequency array gain limits in the deep ocean

Transverse horizontal coherence and low-frequency array gain limits in the deep ocean

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  • 25 Currently reading

Published by Naval Research Laboratory in Washington, D.C .
Written in English

    Subjects:
  • Sound -- Transmission,
  • Sound-waves -- Scattering,
  • Underwater acoustics

  • Edition Notes

    StatementL. Bruce Palmer ... [et al.]
    SeriesNRL report -- 8695
    ContributionsPalmer, L. Bruce, Naval Research Laboratory (U.S.)
    The Physical Object
    Paginationiv, 37 p. :
    Number of Pages37
    ID Numbers
    Open LibraryOL14859638M

    Underwater acoustics is the study of the propagation of sound in water and the interaction of the mechanical waves that constitute sound with the water and its boundaries. The water may be in the ocean, a lake or a tank. Typical frequencies associated with underwater acoustics are . 7th World Glaucoma Congress - Abstract Book 15 Film Festival  FF CO2 LASER-ASSISTED SCLERECTOMY SURGERY (CLASS) Zhu Li Yap*1, Shamira Perera1 1 Singapore National Eye Centre, Singapore, Singapore CLASS was developed as an alternative to manual deep Sclerectomy.

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Transverse horizontal coherence and low-frequency array gain limits in the deep ocean Download PDF EPUB FB2

Get this from a library. Transverse horizontal coherence and low-frequency array gain limits in the deep ocean. [L Bruce Palmer; Naval Research Laboratory (U.S.);]. Experimental measurements of signal coherence and array signal gain are presented for both deep- and shallow-water sound channels.

The signal gain is related to the transverse horizontal coherence Cited by: Probabilistic analysis of Linear Mode vs Geiger Mode APD FPAs for advanced LADAR enabled interceptors. Transverse Horizontal Coherence and Low-Frequency Array Gain Limits in the Deep Ocean.

horizontal line array receivers at ranges from to km for measuring the transverse horizontal coherence. The type of signals under consideration here are the long-range low-frequency ATOC signals trapped in the SOFAR channel.

This is essentially a waveguide problem; as is characteristic of a waveguide problem, the acoustic field. Transverse horizontal cross‐coherence lengths as a function of signal frequency were measured by a hydrophone array 80 m long under homogeneous winter conditions with heavy sea : William M.

Carey. Transverse horizontal coherence and low frequency array gain limits in the deep ocean. Naval Res. Lab., Report Google Scholar. Desaubies Y. () Statistical Aspects of Sound Propagation in the Ocean.

In: Urban H.G. (eds) Adaptive Methods in Underwater Acoustics. NATO ASI Series (Series C: Mathematical and Physical Sciences), vol Cited by: 5. array, including temporal changes of these quantities.

The data used here are receptions of sound at frequencies 85array, a bottom-resting horizontal line array receiver with a vertical line array at one end. Figure 1 shows the location of the receiver, one set of. On the Mode Theory of Very-Low-Frequency Propagation in the Presence of a Transverse Magnetic Field D.

Crombie 1 (Decem ) The effect of a purely transverse horizontal magnetic field on the propagation of very­ low-frequency (vlf) waves is considered. It is ~ho\\'n that the magnetic field introduces. The coherence time and transverse coherence length of a low-frequency (– Hz) sound field that is formed by an omnidirectional point source at a distance of 10–30 km in a shallow-water acoustic waveguide, which is characteristic of an open ocean shelf, were estimated analytically and in a numerical experiment.

An anisotropic field of background internal waves is considered as a source Cited by: 8. In this paper we report the measurements of temporal coherence of acoustic signals propagating through shallow water using data from three experiments in three different parts of the world, with sound speed standard deviation (STD) varying from to 5m∕s near the layer depth.

Temporal coherence is estimated from the autocorrelations of broadband channel impulse functions, the latter Cited by: megameter low frequency 5–75 Hz measurements.1,25 Much related work in the s and s focused on using ray theory to work toward an estimate of temporal coherence by accumulating random phase fluctuations along isolated water-borne ray paths in the deep ocean.2,26 Due to perceived oversimplifications, many moved away from ray.

propagation in the ocean, and the effects of environmental variability on signal stability and coherence. We seek to understand the fundamental limits to signal processing imposed by ocean variability to enable advanced signal processing techniques, including matched field processing and other adaptive array processing methods.

OBJECTIVES. A low frequency means it takes a ____ amount of time for waves to pass. all wind generated waves in open ocean. What are the characteristics of shallow-water waves.

Water depth 1/20L but less than 1/2L, characteristics of both deep and. Low-frequency interaction between horizontal and overturning gyres in the ocean, Geophys. Res. Lett., 35, L, doi/ GL 1.

Introduction [2] Natural low-frequency variability of the oceanic cir-culation, in both the overturning and horizontal gyres, has been an area of much study, particularly as it relates to climate. You measure the amplitude of a transverse waves by the distance from the crest of trough of a wave to the rest position of the medium.

You measure the amplitude of compressional waves by how tightly the medium is pushed together by the compression, the denser the compressions the larger the amplitudes. Skip to Main ContentCited by: %A Worcester, P. %K km range %K Acoustic scattering %K Acoustic tomography %K aperture vertical array %K coherence %K kauai %K low frequency %K north pacific-ocean %K propagation %K source %K temperature %K underwater acoustics %M WOS %P %R /joe %U://WOS %V 34 %X.

To gain insight into the physical mechanisms responsible for deep shadow zone arrivals in long range ocean acoustic propagation we have characterized some key features of the replica correlated signals observed on an ocean bottom seismometer (OBS) deployed on the long-range ocean acoustic propagation experiment We compare the vertical.

In the low-frequency limit, for ka ≪ 1 or a/λ ≪ ½π, R r and X r reduce to () R r = π a 2 ρ 0 c (k a) 2 2 and X r = 8 a 2 ρ 0 c k a 3 where the low-frequency reactance, which is always positive, behaves like an additional vibrating mass M r = X r /ω = (8/3)ρ 0 a 3.

Typical sound speed profile in the deep ocean. 1 i 1 ] 4 i '" i" i i. l 4, 4, 4, 4, 5, 5, Speed (rUs) Figure Example sound speed profiles for various deep ocean locations. Antarctic Ocean (60~ 2. North Pacific (45 to 55~ 3.

Southern oceans (45 to 55~ 4. As shown in Figure 1, only two Lamb modes exist at the low frequency thickness range (1 MHz mm), there exist many high order modes which brings the challenges of mode separation. Thus, simulations are performed on the low range.

Narrowband low frequency sinusoids (5-cycle Gaussian-modulated pulse with a kHz central frequency) are Cited by: 1.When water waves get refracted (move from deep to shallow water), the speed and the wavelength changes. The frequency of the wave does not change; Electromagnetic Spectrum.

Electromagnetic waves are transverse waves. They are electric and magnetic fields that oscillate at 90° to each other. They transfer energy from one place to another.Content Posted in Cranes, Naomi Hirahara. G and Beyond Transmission Technologies for Evolving Optical Networks and Relevant Physical-Layer Issues.

Jobs Dominate News During Florida Election. Mu-M Yb-Sr-5(Po4)(3)F Energy-Storage Optical Amplifier. 10th anniversary of attosecond pulses.