Spectra Covariance Functions And Associated Statistics Of Underwater Acoustic Scattering From Lake Surface
DOWNLOAD
Download Spectra Covariance Functions And Associated Statistics Of Underwater Acoustic Scattering From Lake Surface PDF/ePub or read online books in Mobi eBooks. Click Download or Read Online button to get Spectra Covariance Functions And Associated Statistics Of Underwater Acoustic Scattering From Lake Surface book now. This website allows unlimited access to, at the time of writing, more than 1.5 million titles, including hundreds of thousands of titles in various foreign languages. If the content not found or just blank you must refresh this page
Spectra Covariance Functions And Associated Statistics Of Underwater Acoustic Scattering From Lake Surface
DOWNLOAD
Author : Terry Dale Plemons
language : en
Publisher:
Release Date : 1971
Spectra Covariance Functions And Associated Statistics Of Underwater Acoustic Scattering From Lake Surface written by Terry Dale Plemons and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1971 with Underwater acoustics categories.
A statistical analysis using ensemble averages is made of reverberation data obtained from the wind-driven surface of a fresh water lake. To produce the reverberation, gated FM and cw pulses are transmitted to insonify the scattering surface. The center frequency of each transmitted signal is 110 kHz. Two pulse durations, of 0.1 msec and 1.0 msec, are used in the cw experiment. The bandwidth of the FM signals, whose pulse durations are 1.25 msec, is 9.6 kHz. The transmitter and receiver are located at essentially the same place (R at T); i.e., the operation is monostatic. In the cw experiment the grazing angle is 22 deg and in the FM experiment the grazing angle is 0 deg. (Author).
Scientific And Technical Aerospace Reports
DOWNLOAD
Author :
language : en
Publisher:
Release Date : 1977
Scientific And Technical Aerospace Reports written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1977 with Aeronautics categories.
Characterization Of Active Underwater Acoustic Channels Part Ii Scattering In An Isovelocity Ocean
DOWNLOAD
Author :
language : en
Publisher:
Release Date : 1974
Characterization Of Active Underwater Acoustic Channels Part Ii Scattering In An Isovelocity Ocean written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1974 with categories.
The general approach to scattering phenomena developed here is now applied specifically to underwater acoustic scattering problems in an isovelocity medium, for the present without absorption and inhomogeneous properties other than the various possible scattering mechanisms themselves. Among the principal new results are (1) the explicit inclusion of doppler, which is shown to produce a nonstationary frequency-modulation of the injected signal; (2) the presence and effects of two orders of inhomogeneities in the second-order media statistics, e.g., poisson, or specular point scatterers (k=1) and continuous scattering elements (k=2); (3) the coherence properties and spectrum of the specular component (k=0); (4) necessary and sufficient conditions for the applicability of the poisson model alone (and of the earlier poisson models cited in the literature); (5) conditions that the medium be a WSSUS medium; (6) for weak scattering interactions, the wave number spectra of surfaces and volumes, including the interaction of surface displacement and motion; (7) various experimental programs for the measurement and underwater remote sensing of the medium; (8) an extensive development of wave surface statistics, particularly point and directional covariances, spectra, and wave number spectra for a variety of sea surface models, including the author's recent model; (9) strong-scattering results; and (10) channel characterizations by means of the local bicovariance and cospreading functions, with specific examples
Scientific And Engineering Studies Underwater Acoustic Scattering
DOWNLOAD
Author :
language : en
Publisher:
Release Date : 1987
Scientific And Engineering Studies Underwater Acoustic Scattering written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1987 with Underwater acoustics categories.
Characterization Of Active Underwater Acoustic Channels Part I A New Formulation For Scattering By Random Media And Interfaces
DOWNLOAD
Author :
language : en
Publisher:
Release Date : 1974
Characterization Of Active Underwater Acoustic Channels Part I A New Formulation For Scattering By Random Media And Interfaces written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1974 with categories.
A general approach to scattering phenomena is developed and applied specifically to underwater acoustic scattering situations involving the medium and its interfaces. The fundamental elements of the method are the development of the available scattering elements into a hierarchy of independent scatter processes, based on the scatterers activated, at any given instant. This, with the governing class of Langevin equation (e.g., forms of the (scalar) wave equation here) permits a corresponding development, in linear superposition, of the received, scattered field x sub m as a hierarchy of independent processes, x sub m(k), k=0,1,2., representing different scales of inhomogeneity which may be present in the medium, or upon its interfaces. First- and second-order moments (covariances and generalized spectra) are obtained in canonical form, representing global properties of the channel and the local properties of the medium itself. A number of probability densities are also obtained in important limiting cases, e.g. various (conditional) normal p.d.f.'s. Part I concludes with some remarks on an experimental program, designed to test and quantify various aspects of the general model, both for studies of the medium itself (and its associated interfaces), and for the broad class of statistical communication applications, such as detection, extraction, classification, communications per se, as well as signal and aperture design problems
Covariance Functions And Related Statistical Properties Of Acoustic Backscattering From A Randomly Rough Air Water Interface
DOWNLOAD
Author : Gary R. Wilson
language : en
Publisher:
Release Date : 2014
Covariance Functions And Related Statistical Properties Of Acoustic Backscattering From A Randomly Rough Air Water Interface written by Gary R. Wilson and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014 with Sound categories.
Considerations In Upper Ocean Doppler Velocimetry
DOWNLOAD
Author : David Scott Hansen
language : en
Publisher:
Release Date : 1984
Considerations In Upper Ocean Doppler Velocimetry written by David Scott Hansen and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1984 with Oceanographic instruments categories.
Lectures On Marine Acoustics
DOWNLOAD
Author : Jerald W. Caruthers
language : en
Publisher:
Release Date : 1971
Lectures On Marine Acoustics written by Jerald W. Caruthers and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1971 with Underwater acoustics categories.
Selected Advanced Topics In Marine Acoustics
DOWNLOAD
Author : Jerald W. Caruthers
language : en
Publisher:
Release Date : 1973
Selected Advanced Topics In Marine Acoustics written by Jerald W. Caruthers and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1973 with Sonar categories.
Covariance Function Of The Acoustic Backscatter From A School Of Fish
DOWNLOAD
Author : Robert Leroy Swarts
language : en
Publisher:
Release Date : 1972
Covariance Function Of The Acoustic Backscatter From A School Of Fish written by Robert Leroy Swarts and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1972 with Underwater acoustics categories.
A recently developed statistical model for first-order scattered fields is used to predict the normalized covariance function of an underwater acoustic signal backscattered by a hypothetical school of fish. The fish school is configured as an oblate spheroid with the individual fish Poisson distributed within the school. Empirical covariance functions are determined using ensemble averaging techniques from experimental data obtained by insonifying an actual school of fish with gated 28.2-kIlz continuous tone signals. A comparison of theory with the experimental results is made.