Computer Science – Performance
Scientific paper
Nov 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984stin...8515798s&link_type=abstract
Unknown
Computer Science
Performance
Electromagnetic Interference, Lunar Radiation, Microwaves, Receivers, Solar Radiation, Spacecraft Instruments, Stellar Radiation, Infrared Radiation, Mathematical Models, Radiation Absorption, Signal Distortion, Solar Cosmic Rays
Scientific paper
Earth orbiting microwave receivers which are vulnerable to the interference from natural sources, mainly, the Sun and the Moon, are discussed. The irradiance from the Sun affects microwave receivers in two ways: (1) the infrared component of the irradiance causes nonuniform heating in metal structures and produces distortions that affect electrical performance; and (2) the graybody radiation component of the solar irradiance enters the collecting aperture of the antenna and the feed ports of the calibration circuits. The graybody radiation operates to degrade the signal to noise ratios and vitiate the internal calibration accuracy. The magnitudes of interference from the Sun and the Moon are analyzed and mathematical expressions are derived which serve to quantify the expected interference levels.
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