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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.

A reproduceable noise generator

Watts, Donald George January 1958 (has links)
This thesis describes the design of a device for generating a reproduceable noise signals. The noise signal is generated by adding three periodic waveforms having non-multiple periods. Pulse techniques are used in the generation of the member functions so that the output may be reproduced exactly. Theoretical and experimental determinations of the amplitude probability distribution and of the autocorrelation function of the signal were made. On the basis of tests and observations made, it is concluded that the signal generated may be considered a noise signal having a near-Gaussian amplitude probability distribution, very little correlation for time-shifts greater than 30 seconds, and a bandwidth of about 60 cps. / Applied Science, Faculty of / Electrical and Computer Engineering, Department of / Graduate

Is open book testing viable within a military occupational producing school 25 uniform, Signal Support Systems Specialist, at Fort Gordon, GA.

Cierpial, Edwin C. January 2009 (has links) (PDF)
Thesis PlanB (M.S.)--University of Wisconsin--Stout, 2009. / Includes bibliographical references.

Acoustic determination of adhesive bond delamination

Batel, Mehdi 08 1900 (has links)
No description available.

Transient response of nonuniform dispersive media

Thorleifson, Jon Michael January 1967 (has links)
The transient response of one-dimensional nonuniform dispersive media is studied through the use of numerical techniques for the inversion of the Laplace transforms of the transient signals. The media considered are those in which the permittivity varies in one spatial dimension only and for which an analytical or numerical solution of the wave equation can be obtained. Two numerical techniques for the inversion of Laplace transforms are used, one in which the inverse transform is obtained in terms of a series of generalized Laguerre polynomials and the other in which the inverse is obtained by direct numerical integration of the complex inversion integral. Responses are calculated for the following cases; (a) a uniform isotropic plasma, (b) dielectric media with a piecewise linear variation in permittivity and (c) isotropic cold plasmas with a piecewise linear variation in electron density, for step-modulated and rectangular-pulse-modulated carrier input signals. It is shown that the results for case (a) compare favorably with the known exact solution, for a unit-step-modulated carrier input signal. / Applied Science, Faculty of / Electrical and Computer Engineering, Department of / Graduate

Electromagnetic compatibility of power electronic locomotives and railway signalling systems

Steyn, Barend Marthinus 28 July 2014 (has links)
D.Ing. (Electrical And Electronic Engineering) / Please refer to full text to view abstract

A Comparison of Two Techniques for Estimating the Travel Time of an Acoustic Wavefront Between Two Receiving Sensors

Montalbano, Frank J. 01 January 1984 (has links)
In recent years the United States Navy has concentrated most of its Anti-Submarine Warfare (ASW) research and development efforts toward passive sonar. Its ability to locate enemy targets without being detected gives the passive sonar system a supreme strategic advantage over its active counterpart. One aspect of passive sonar signal processing is the time delay estimation of an underwater acoustic wavefront. From this estimation the location and velocity of the radiating source (target) can then be determined. This report compares two popular methods of estimating time delay utilizing computer simulations of each: the cross correlator and the beamformer.

Signal detection and enhancement of infrasound events

Schuette, Mark Louis January 2011 (has links)
Typescript (photocopy). / Digitized by Kansas Correctional Industries

Vertical plane obstacle avoidance and control of the REMUS autonomous underwater vehicle using forward look sonar / Vertical plane obstacle avoidance and control of the Remote Environmental Monitoring Units autonomous underwater vehicle using forward look sonar

Hemminger, Daniel L. 06 1900 (has links)
Current rates of technological advancement continue to translate into changes on our battlefields. Aerial robots capable of gathering reconnaissance along with unmanned underwater vehicles capable of defusing enemy minefields provide evidence that machines are playing key roles once played by humans within our military. This thesis explores one of the major problems facing both commercial and military UUVs to date. Successfully navigating in unfamiliar environments and maneuvering autonomously to avoid obstacles is a problem that has yet to be fully solved. Using a simulated 2-D ocean environment, the work of this thesis provides results of numerous REMUS simulations that model the vehicle's flight path over selected sea bottoms. Relying on a combination of sliding mode control and feedforward preview control, REMUS is able to locate obstacles such as seawalls using processed forward look sonar images. Once recognized, REMUS maneuvers to avoid the obstacle according to a Gaussian potential function. In summary, the integration of feedforward preview control and sliding mode control results in an obstacle avoidance controller that is not only robust, but also autonomous.

Luminous intensity measurements for LED related traffic signals and signs

Jiang, Zhaoning. Zheng, Jim P. January 2004 (has links)
Thesis (M.S.)--Florida State University, 2004. / Advisor: Dr. Jim P. Zheng, Florida State University, College of Engineering, Dept. of Electrical and Computer Engineering. Title and description from dissertation home page (viewed June 18, 2004). Includes bibliographical references.

Autonomous-agent based simulation of anit-submarine warfare operations with the goal of protecting a high value unit /

Akbori, Fahrettin. January 2004 (has links) (PDF)
Thesis (M.S. in Modeling, Virtual Environments and Simulation (MOVES))--Naval Postgraduate School, March 2004. / Thesis advisor(s): Christian Darken, Curtis Blais. Includes bibliographical references (p. 103-104). Also available online.

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