Physics
Scientific paper
Dec 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufm.p22a0057b&link_type=abstract
American Geophysical Union, Fall Meeting 2003, abstract #P22A-0057
Physics
6964 Radio Wave Propagation, 6969 Remote Sensing, 6974 Signal Processing, 6979 Space And Satellite Communication, 6999 General Or Miscellaneous
Scientific paper
In the morning (UTC) of August 29th, 2003, with Mars in it closest opposition in 60,000 years, the Mars Odyssey spacecraft was tracked with the SRI 46-m dish antenna located in the Stanford foothills. At 07:44 UTC, Odyssey's UHF Relay was turned on, with its 10 watt beacon in CW mode, and a 22 dB/Hz SNR signal was received three minutes later at the SRI dish. The Doppler compensated frequency of 437.100 MHz was observed using real time spectrograms that revealed a weaker, 0 dB/Hz SNR signal crossing the Odyssey beacon with the apparent Doppler signature of a specular surface reflection. Further analysis of the Doppler profile supports the interpretation of a surface reflection which traverses northern Martian latitudes from 16 N to close to the pole and back down to 60 N. The reflection's intensity profile laid across the ground track affords a comparison of the UHF's 0.7 m wavelength with the surface reflections from the X-band MGS occultation profiles.
Barbieri A. J.
Callas John L.
Cousins M. D.
Gunnarsdottir Hrefna M.
Ilott P. A.
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