Physics
Scientific paper
Jan 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976kosis..14..140p&link_type=abstract
Kosmicheskie Issledovaniia, vol. 14, Jan.-Feb. 1976, p. 140-143. In Russian.
Physics
Atmospheric Refraction, Atmospheric Stratification, Mars Atmosphere, Phase Shift, Planetary Ionospheres, Radar Measurement, Atmospheric Models, Density Distribution, Doppler Radar, Error Analysis, Radar Echoes
Scientific paper
The changes introduced as the result of horizontal gradients in the Martian ionosphere into the angles of refraction and the phase path of radar signals transmitted to the surface of the planet from a satellite are analyzed. The analysis is based on a previously reported (Kazantsev, 1973) model of the Martian ionosphere. It is shown that horizontal gradients along the line of communication exert an influence on changes in the free Doppler frequencies ten times stronger than that of transverse gradients. The measurement of the angle of refraction is more strongly affected by errors inherent in the model than by the size of the gradient. The absolute correction to the angle of refraction and the phase path of the signal is dependent on the frequency of the signal, becoming insignificant at frequencies around 1000 MHz.
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