Astronomy and Astrophysics – Astronomy
Scientific paper
May 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987pggp.rept..243t&link_type=abstract
In NASA, Washington, Reports of Planetary Geology and Geophysics Program, 1986 p 243-244 (SEE N87-23341 16-91)
Astronomy and Astrophysics
Astronomy
Mars Surface, Radar Astronomy, Radar Echoes, Superhigh Frequencies, Circular Polarization, Continuous Wave Radar, Radar Resolution, Spread Spectrum Transmission
Scientific paper
Radar echoes from the planet Mars were obtained on 27 S-band (wavelength = 12.5 cm) and 2 X-band (wavelength = 3.5 cm) tracks using the Goldstone Solar System Radar. These observations took advantage of the favorable 1986 opposition since the Earth-Mars distance was 0.40 AU at opposition and radar echo strength is proportional to inverse-fourth-power of the distance to the target. The coverages of the Goldstone observations are summarized. The observations were conducted via the CW-spectra techniques described by Harmon et al. A continuous tone was transmitted at Mars and the radar echo was sampled to obtain a Doppler spread spectrum. Each received event was separated into polarized (opposite sense circular) and depolarized (same sense circular) periods. There was one successful ranging run which had a resolution of 2 microseconds. This should yield surface heights accurate to 300 meters.
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