Computer Science – Sound
Scientific paper
Jun 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976jatp...38..583s&link_type=abstract
Journal of Atmospheric and Terrestrial Physics, vol. 38, June 1976, p. 583-592.
Computer Science
Sound
Computerized Simulation, Holography, Ionospheric Sounding, Photographic Measurement, Radio Observation, Wave Front Reconstruction, Atmospheric Models, Cameras, Diffraction Patterns, Inhomogeneity, Radio Antennas, Superhigh Frequencies, Very High Frequencies
Scientific paper
A technique for the three-dimensional reconstruction of ionospheric inhomogeneities is presented. The technique utilizes a ground-based, sparsely filled antenna array to observe VHF or SHF transmissions from an orbiting or geostationary satellite. Amplitude and phase measurements at each array element provide a sampling of the diffraction pattern caused by the inhomogeneities. Image reconstruction is achieved digitally by inverse propagation using Fourier optical techniques in a computational analogue of an optical imaging process similar to that involved in holography. The paper discusses the theory of the technique, practical considerations involved in its implementation, and the design of a demonstration experiment. Computer simulations of the experiment using idealized models of the irregularities are presented.
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