Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 7 of 7 for “"Phase Screen"”.
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Propagation of Gaussian Beams Through a Modified von Karman Phase Screen
Gaussian beam propagation through discrete phase screens and an extended random media has been studied extensively over the last four decades. In this thesis, we numerically examine the effects of a discrete phase screen during Gaussian beam propagation on the scintillation index for a single beam …
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Numerical simulation of optical wave propagation through random media
… plane waves through a one-dimensional Gaussian phase screen and a two-dimensional Gaussian extended medium are simulated numerically, and wave statistics are calculated from the data obtained by the numerical simulation. For instantaneous realization of a random medium, a simplified version of …
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Simulation of High Frequency Waves Reflected From a Turbulent Ionosphere for Spread Spectrum Systems
… received wave field is performed by using the phase screen-diffraction layer method. This scheme simulates the propagation of an HF wave in the turbulent ionosphere. Based on the forward-scatter approximation, the scheme computes sequentially the effects of phase fluctuations due to the …
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Radio Propagation Through Density Irregularities in the Auroral Ionosphere
… that distort the incident radio wave by inducing phase and amplitude fluctuations. These fluctuations are called<em> ionospheric</em><em> scintillation</em>. Scintillation effects can be detrimental to Global Navigation Satellite Systems (GNSS) such as Global Positioning System (GPS), but the …
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Developing a 2-Phase Screening System to Assess the in vitro and in vivo Stability of Engineering Native Seed Storage Proteins
… this thesis describes the development of a 2-phase screening system that facilitates protein engineering of native 11S globulins by assessing the ability of stable site-directed variants to accumulate in seeds. Phase I employs E. coli as an expression system to assess the thermodynamic …
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Contemporary Ionospheric Scintillation Studies: Statistics, 2D Analytical and 3D Numerical Inversion
… irregularities can lead to random amplitude and phase fluctuations of the signal, otherwise known as scintillation, which can severely impact the performance of Global Navigation Satellite System (GNSS) and communication systems. Research into high latitude scintillation, through statistical …
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Evaluation of Millimetre-wave Coherent Scattering from a Sea surface covered by Foam modelled as Sequences of Thin Phase-Scattering Screens using Split-Step Fourier Method
… foam and modelled as sequences of thin and deep phase scattering screens. The propaga- tion media is a dense random media which comprise randomly distributed air-bubbles that follow a log-normal distribution pattern. The log-normal distribution is a skewed distribu- tion with low geometric mean …