Theses and Dissertations
Now showing items 1-9 of 9
A digital filter representation of the ASQ-81 magnetometer.
(Monterey, California. Naval Postgraduate School, 1983-09)
A digital filter representation of the ASQ-81 magnetometer is derived from the s-plane transfer functions of the system through the use of a bilinear transformation. A FORTRAN computer program is written which applies ...
Optimum frequency for propagation of sound in shallow sound channels
Optimum frequency for propagation of sound in shallow sound channels was studied using two acoustic transmission loss models. The split-step Parabolic Equation model (a full-wave model) and the Fast Asymptotic Coherent ...
ECTRACE : three dimensional acoustic ray trace program
Acoustic ray paths in the ocean are known to exhibit significant horizontal deflections after repeated reflections from the bottom. The effect may be quantitatively and qualitatively observed through a ray trace model ...
Fiber optic gradient hydrophone construction and calibration for sea trial.
A Mach-Zehnder interferometric fiber optic gradient hydrophone, for operation at 632.8 nm wavelength, was designed and constructed for testing in the laboratory. Two individual fiber optic hydrophone sensing coils with ...
Use of the Wavenumber Technique with the Lloyds Mirror for an Acoustic Doublet.
(Monterey, California. Naval Postgraduate School, 1985-03)
This thesis examines a method to determine the depth of a point source in an isospeed ocean environment. Using the Fourier Transform on the acoustic pressure field in the range domain results in the attainment of the ...
The effects of color, exposure time, and target density on tactical display recognition tasking
This study investigated the effects of a partially redundant color code on a visual search task. Monochrome and partially redundant color displays consisting of NTDS symbology, in concentrations of 18 targets and 36 ...
A study of the feasibility of using a buried sonar transducer to echo-locate objects buried in sediment.
An analysis is conducted to determine the feasibility of using a buried sonar transducer to echo-locate torpedoes imbedded in sediment. The active sonar equation is examined and representative values for each term are ...
An acoustic bubble density measurement technique for surface ship waters
The Dual Frequency Pump Method of acoustically determining point by point bubble cloud densities was studied to determine the practicality of using this acoustic technique to determine bubble densities in surface ship ...
Oceanographic analysis of sun glint images taken on space shuttle mission STS 41-G
A series of four sun glint images taken by the crew of the space shuttle Challenger, mission STS 41-G, on 8 October 1984 were analyzed and compared to NOAA-7 AVHRR infrared images and to bathythermographs of the same area. ...
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Antisubmarine Warfare Academic Group (9)