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Author Archives: Chuck
A Comparison of Phase Locked Loops and Frequency Hypothesis Tracking
Processing low orbiting beacon satellite data has been a challenge largely because of the limited vehicle space for a VHF, UHF, L-band antenna system. The effective antenna patterns severely limit range of uniform illumination range with a common phase center. … Continue reading
Posted in Signal Processing
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IES 2015 Paper
IES2015Rino is an oral presentation of the new material introduced in the previous post Application of Wavelet Based Analysis to C/NOFS Ionospheric Density Measurements.
Posted in New Results
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AGU 2013 Poster and Supplemental Material
Tomographic reconstruction of ionospheric electron density profiles from GPS satellite measurement is being used extensively for global ionospheric monitoring. For the most part, the reconstruction process is a constrained iterative process. The results are sensitive to errors and initial conditions. … Continue reading
Posted in Propagation Theory Applications
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Phase Screen Models for Numerical Computation
To the extent that propagation disturbances can be approximated by an equivalent phase-screen, there are analytic models that allow computation of the power-spectrum of the intensity of the field as it propagates away from the phase screen. The analysis involves … Continue reading
Posted in Propagation Models, Scintillation Theory Book
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Beacon Satellite Symposium 2013 Keynote Talk
The following attachment is the keynote talk presented at the Beacon Satellite Symposium, Bath England, July 8, 2013 KeynoteTalk
Posted in General Interest
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Oblique Propagation
Chapter 4 of my book develops a computational framework for beacon satellite propagation. With a reference coordinate system centered at ionospheric heights, even small propagation angles lead to very large displacements in the observation plane. To avoid this problem, a … Continue reading
Posted in Scintillation Theory Book
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Statistical Theory of Scintillation-Update
In Chapter 3 of my book the system of differential equations that characterize the propagation of complex two-frequency field moments in irregular media were developed. The attached note reviews this material and its connection to the original and most cited … Continue reading
Posted in General Interest
Tagged Scintillation, Strong Focusing
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Optical Applications of Full Diffraction
Revised May 30, 2011 Earlier blogs on this topic discussed the relation of The Theory of Scintillation with Applications to Remote Sensing, which uses the forward propagation method (FPE) , to optical methods based on the Huygens-Fresnel construction. The revised … Continue reading
Posted in Propagation Theory Applications
Tagged Diffraction, Strong Focusing
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What’s the Book About
The theory of scintillation is about electromagnetic wave propagation in structured media. But why does a phenomenon that has been studied for nearly a century now merit a new theoretical expose? One part of the answer is that the essential … Continue reading
Posted in General Interest
Tagged Scintillation, Strong Focusing
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Strong Focusing–The LOGO
So what is the logo all about? As an electromagnetic wave field propagates in a structured medium, the structure is first imparted to the phase of the evolving wave field. As the wave field continues to propagate, the wave intensity … Continue reading
Posted in General Interest
Tagged Radio Propagation, Scintillation
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