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Radar observations of Mars

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Abstract

Radar observations in the past were used to investigate the astronomical properties of the planet and its reflectivity in radar frequencies. Because of the difficulties in signal detection and processing due to the low level of return signal, the data were published only in the form of Doppler spectrograms. In view of the increasing interest in Mars and the practicability of missions to Mars this paper uses the published data to evaluate the angular behavior of the radar backscattering characteristics of Mars; a required information for the design of radar equipment of spacecrafts. In addition, results of past observations are summarized, analyzed and discussed in terms of a general interpretation of the Martian surface. It is found that the generally accepted suggestion that Mars is a relatively smooth planet, smoother than the Moon, is confirmed by most of the results, but not all observations agree with this hypothesis. A surface model of relief and composition based on radar information in conjunction with other observations is reviewed. The processing methods of radar return signals are compared for a better understanding of the handling of the Doppler spectrogram, a form which is most widely used for the presentation of processed data.

An extensive bibliography of available papers and reports relevant to radar observations and the surface and lower atmosphere of Mars is included. The literature is concerned mainly with post-Mariner IV experiment, the mission which changed considerably many conceptions of Mars.

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  1. Center for Research, Inc., Engineering Science Division, University of Kansas, Lawrence, Kan., USA

    Arye Zachs & Adrian K. Fung

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  1. Arye Zachs
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Zachs, A., Fung, A.K. Radar observations of Mars. Space Sci Rev 10, 442–454 (1969). https://doi.org/10.1007/BF00203622

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