An investigation into backscattered cross section calibration of an acoustic sounder used for analysis of lower atmospheric turbulence
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Authors
Davison, David Paul, Jr.
Subjects
Acoustic echosounders
Backscattered calibration
Differential scattering cross section
Backscattered cross section
Continued fraction
Backscattered calibration
Differential scattering cross section
Backscattered cross section
Continued fraction
Advisors
Walters, Donald L.
Date of Issue
1988-12
Date
December 1988
Publisher
Monterey, California. Naval Postgraduate School
Language
Abstract
Atmospheric temperature fluctuations quantified by C(r2) degrade the spatial and temporal coherence of electromagnetic and acoustic waves propagating in the atmosphere. A computer controlled atmospheric echosounder developed at the Naval Postgraduate School measures a time averaged C(r2) profile of the lower atmosphere. Assigning the proper C(r2) values to the backscattered return signals depends on an accurate calibration of this instrument. Calibration involves determination of the product of the echosounder's transmission efficiency E(t) and reception efficiency E(r). This thesis provides a preliminary investigation of a calibration process using pulsed acoustic energy backscattered from hard spheres. Supporting software calculates the desired product E(r)E(t) based on an assumption of echosounder efficiency reciprocity. Results of the calibration process investigation indicate the software performs as intended and that the proposed calibration method possesses sufficient merit to warrant further development.
Type
Thesis
Description
Series/Report No
Department
Department of Physics
Organization
Identifiers
NPS Report Number
Sponsors
Funding
Format
156 p.
Citation
Distribution Statement
Approved for public release; distribution is unlimited.
Rights
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.