Ionospheric holography. I - The holographic interpretation of ionospheric data. II - The analysis of a set of ionospheric holograms

Details Ionospheric holography. I - The holographic interpretation of ionospheric data. II - The analysis of a set of ionospheric holograms Ionospheric holography. I - The holographic interpretation of ionospheric data. II - The analysis of a set of ionospheric holograms

Apr 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980jatp...42..385r&link_type=abstract

Journal of Atmospheric and Terrestrial Physics, vol. 42, Apr. 1980, p. 385-391, 393-399, 401-406.

Computer Science

Sound

Hologrammetry, Holography, Ionospheric Propagation, Ionospheric Sounding, Radio Transmission, Satellite Transmission, Coherent Light, Doppler Effect, Imaging Techniques, Optical Equipment, Phase Shift

Scientific paper

Various techniques for ionospheric holography are considered, and it is shown that the recording of both amplitude and phase of the downcoming signal is technically possible and is preferable to the recording of amplitude or intensity only. It is also shown that the 40 MHz radio transmissions from satellites may be simply recorded in the form of one-dimensional Gabor holograms; in addition, a bench study on a test object has revealed that useful reconstructions may be obtained from records showing weak to moderate scintillation. An experiment is described in which a received satellite signal was recorded on photographic film in the form of a hologram, which was analyzed using a laser and an optical bench. The relation of the optical focal length to the height of the scatterer is derived, and it is shown that there are scatterers at all heights in the ionosphere, with a concentration in the E region. It is also found that the model of the ionosphere as a relatively thin layer of irregularly spaced scatterers is a great oversimplification.

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