Naval Postgraduate School
Faculty and Researchers Collection
Now showing items 1-10 of 9913
Sound‐pressure level calculations using the RRA algorithm for depth‐dependent speeds of sound valid at turning points and focal points
(Acoustical Society of America, 1993)
Sound‐pressure level (SPL) calculations are made along individual ray paths for one‐dimensional, depth‐dependent, speeds of sound using an enhanced version of the recursive ray acoustics (RRA) algorithm. The SPL calculations ...
Sound-pressure level calculations using the RRA algorithm for depth-dependent speeds of sound valid at turning points and focal points
(IEEE, 1994)
Sound-pressure level (SPL) calculations are made along individual ray paths for arbitrary,one-dimensional,depth- dependent speeds of sound using an enhanced version of the RRA (recursive ray acoustics) algorithm. The SPL ...
LSVOCN: A pulse‐propagation model for a linear, space‐variant ocean
(Acoustical Society of America, 1990)
A full‐wave, pulse‐propagation model for three‐dimensional wave propagation in a Pekeris waveguide based on linear systems theory is presented. The randomly rough ocean surface and bottom are accounted for via coherent ...
Localization of multiple broadband targets via frequency domain adaptive beamforming for planar arrays
(Acoustical Society of America, 1989)
Computer simulation studies of a frequency domain adaptive beamforming algorithm for planar arrays are presented. The algorithm, which can localize multiple broadband targets, is a modified complex least‐mean‐square (LMS) ...
Linear time-invariant space-variant filters and the WKB approximation
(IEEE, 1985)
Computer simulated output electrical signals, based on derived mathematical models, were generated at each element in a receive planar array of complex weighted point sources. The output electrical signals depend on the ...
Linear systems theory and its relationship to ocean acoustics
(Acoustical Society of America, 1990)
The purpose of this talk is to demonstrate the consistency and relationships between linear systems theory and the physics of propagation of small‐amplitude acoustic signals in fluid media. Using the principles of linear, ...
Comments on the relationships between linear systems theory and the free‐space solution of the inhomogeneous linear wave equation
(Acoustical Society of America, 1990)
Using the principles of linear, time‐variant, space‐variant, filter theory, and time‐domain and spatial‐domain Fourier transforms, derivations of the solutions of the linear, three‐dimensional, inhomogeneous wave equation ...
Generalized Kirchhoff approach to the ocean surface‐scatter communication channel. Part II: Second‐order functions
(Acoustical Society of America, 1982)
Three second‐order functions which characterize the ocean surface‐scatter communication channel are derived from the transfer function of the ocean surface. These second‐order functions include the two‐frequency correlation ...
Three-dimensional ray acoustics: new expressions for the amplitude, eikonal, and phase functions
(IEEE, 1989)
New three-dimensional ray-acoustics expressions for the amplitude, eikonal, and phase along a ray path are derived. These expressions clearly indicate the numerical calculations that must be performed in order to evaluate ...
Three necessary conditions for the validity of the Fresnel phase approximation for the near-field beam pattern of an aperture
(IEEE, 1993)
A simple, straightforward derivation of three necessary conditions that define the region of validity for the near-field directivity function (beam pattern) of an aperture (array) is presented. The derivation of all three ...