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Document Type : Latin Dissertation
Language of Document : English
Record Number : 151435
Doc. No : ET23227
Main Entry : JONATHAN WILLIAM BENSON
Title Proper : ACOUSTIC COHERENCE IMAGING THROUGH THE ATMOSPHERE
Note : This document is digital این مدرک بصورت الکترونیکی می باشد
Abstract : The imaging of acoustic "scenes" through the atmosphere is a subject with little treatment inthe literature. This thesis strives to set the state of the art in this field by presenting imagingmethods and their performance in the turbulent atmosphere. Both narrowband interferometryand wideband techniques that can be solved using tomographic methods are presented. Anextensive series of field experiments was conducted in which multiple sensor arrays ofmicrophones recorded the signals received from loudspeaker sources outdoors under varyingatmospheric conditions. Besides providing data for characterizing the imaging performanceunder different conditions, the field data also allowed for measurements to be made thatcharacterize the atmosphere itself. Methods for enhancing image quality are discussed. It isshown that the popular self-calibration family of reconstruction methods from the radioastronomy community are not applicable to the acoustic imaging case. A new method. basedon estimating the intensity distribution jointly with atmospheric distortion model parametersusing multiple short integration period measurements, is....-....,....-...,..tested for theQ1 PC1 bus cardBoth these projects mere sofixare des elopment efforts tonards contributing to dlfferentaspects of Roboucs and lZ1echatronics projects m the Controls and Roboucs Group..
Subject : Electericl tess
: برق
electronic file name : TL46463.pdf
Title and statement of responsibility and : ACOUSTIC COHERENCE IMAGING THROUGH THE ATMOSPHERE [Thesis]
 
 
 
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