Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981rasc...16...35t&link_type=abstract
Radio Science, vol. 16, Jan.-Feb. 1981, p. 35-45.
Astronomy and Astrophysics
Astronomy
Electromagnetic Interactions, Radar Astronomy, Radio Astronomy, Radio Frequency Interference, Satellite Power Transmission, Solar Power Satellites, Antenna Arrays, Cryogenic Cooling, Electromagnetic Noise, Radio Telescopes, Solar Cells, Thermal Noise, Thermal Radiation
Scientific paper
It is noted that when the satellite power system (SPS) is in operation, the power signal and its harmonics, which fall close to radio astronomy bands, may cause overloading of input stages. Mitigation will require the development of cryogenically cooled filters. Radiation within radio astronomy bands can arise from transmitter-generated noise, thermal noise from the large solar cell arrays, and possibly from intermodulation, component failures, and turn-on transients. It is noted that noise and harmonics can also be generated by the power-collecting rectennas, and that there may be propagation effects resulting from ionospheric heating. It is concluded that for any radio telescope, a zone of sky will be centered on the arc of satellites and observations here with high sensitivity will be precluded. It is estimated that the width of the zone, as determined by thermal radiation, will vary from about 30 deg for single-antenna telescopes to a few degrees for high-resolution arrays and interferometers. It is noted that since there will be some degradation in performance in bands close to the power signal and its second harmonic, adequate shielding by terrain between radio observatories and power receiving sites will be necessary.
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