Physics
Scientific paper
Nov 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975jgr....80.4313s&link_type=abstract
Journal of Geophysical Research, vol. 80, Nov. 1, 1975, p. 4313-4324.
Physics
3
Holography, Ionospheric Disturbances, Radio Scattering, Satellite Tracking, Imaging Techniques, Magnetoionics, Scintillation, Very High Frequencies
Scientific paper
The holographic method has been recently introduced to study satellite scintillations. Only one ground station is needed to receive the radio hologram. The object wave scattered or diffracted by irregularities is measured in relation to a harmonic reference wave. The resulting amplitude and phase information can be interpreted, by using the reciprocity theorem, as the one-dimensional radio hologram at the height of the satellite orbit. In this paper the mathematical theory is developed to reconstruct the image. The theory is analogous to that used in acoustical holography to form the image digitally. Since the hologram is only one dimensional, the image can be reconstructed two-dimensionally in the plane which is defined by the vector from the ground station to the satellite and the satellite velocity vector. The Fresnel-Fourier transform is used to form the image in the reconstruction plane at various distances from satellite to ground. The calculations with the computer are carried out by using the fast Fourier transform.
Schmidt Georg
Tauriainen A.
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