Computer Science
Scientific paper
Mar 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983stin...8335224w&link_type=abstract
Unknown
Computer Science
Antenna Design, Earth Terminal Measurement System, Earth Terminals, Figure Of Merit, Microwave Transmission, Spacecraft Communication, Calibrating, Moon, Noise, Radio Stars, Standards, Sun
Scientific paper
Three basic measurement techniques and the associated measuring systems are examined to determine which are most likely to meet the needs of measuring the figure of merit (G/T) for future 20 GHz satellite systems: use of the Sun as a known source, use of the Sun as an intercomparison source with a calibrated reference terminal, and the use of a satellite signal as an intercomparison source. It is shown that the method of using the Sun as a known source is not very accurate (about 1.5 dB uncertainty), but that using the Sun as a transfer source is useful (0.3 dB to 0.5 dB, depending on measuring system) for Earth terminals with antenna diameter less than 1.8 m (6 ft). For Earth terminals with antenna diameters greater than 1.8 m (6 ft), the Sun cannot be used as a transfer source for technical reasons, but a satellite signal can be used as a transfer source.
Daywitt W. C.
Wait D. F.
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