Non-Rayleigh scattering by a randomly oriented elongated scatterer
MetadataShow full item record
KeywordMonte Carlo method
The echo statistics of a randomly rough, randomly oriented prolate spheroid that is randomly located in a beampattern are investigated from physics-based principles both analytically and by Monte Carlo methods. This is a direct-path geometry in which reflections from neighboring boundaries are not a factor. The center of the prolate spheroid is assumed to be con fined to the plane containing the MRA (maximum response axis). Additionally, the rotation of the prolate spheroid is assumed to always be in this plane. The statistics and, in particular, the tails of the probability density function (PDF) and probability of false alarm (PFA) are shown to be strongly non-Rayleigh and a strong function of shape of scatterer. The tails are shown to increase above that associated with a Rayleigh distribution with increasing degree of elongation (aspect ratio) of the scatterer and when roughness effects are introduced. And, as also shown in previous studies, the effects associated with the scatterer being randomly located in the beam contribute to the non-Rayleigh nature of the echo. The analytically obtained results are compared to Monte Carlo simulations for verification.
Submitted in partial fulfillment of the requirements for the degree of Master of Science at the Massachusetts Institute of Technology and the Woods Hole Oceanographic Institution August 2012
Showing items related by title, author, creator and subject.
Broadband and statistical characterization of echoes from random scatterers : application to acoustic scattering by marine organisms Lee, Wu-Jung (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2013-02)The interpretation of echoes collected by active remote-sensing systems, such as sonar and radar, is often ambiguous due to the complexities in the scattering processes involving the scatterers, the environment, and the ...
Acoustic scattering of broadband echolocation signals from prey of Blainville's beaked whales : modeling and analysis Jones, Benjamin A. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2006-09)Blainville's beaked whales (Mesoplodon densirostris) use broadband, ultrasonic echolocation signals (27 to 57 kHz) to search for, localize, and approach prey that generally consist of mid-water and deep-water fishes and ...
Wilkin, John L. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1988-09)A study is conducted of the scattering of freely-propagating subinertial frequency coastal-trapped waves (CTWS) by large variations in coastline and topography using analytical and numerical techniques. Particular attention ...