Feasibility of in-orbit testing of inflatable antennas with celestial sources

Details Feasibility of in-orbit testing of inflatable antennas with celestial sources Feasibility of in-orbit testing of inflatable antennas with celestial sources

Jun 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990fiti.book.....b&link_type=abstract

Feasibility of in-orbit testing of inflatable antennas with celestial sources., by Baars, J. W. M.. European Space Agency, 75 -

Astronomy and Astrophysics

Astronomy

1

Calibrating, Feasibility Analysis, Moon, Orbital Space Tests, Radio Sources (Astronomy), Satellite Antennas, Sun, Antenna Radiation Patterns, Fresnel Region, Radio Spectra, Solar Radio Emission

Scientific paper

The feasibility of measuring the main parameters of a 3 m class satellite borne inflatable antenna at 10 GHz by regarding the Sun or the Moon as a test transmitter is investigated. Provided the measurements are made during a relatively quiet period of solar activity, good data can be obtained for beam width, gain, and near sidelobe levels. The pointing accuracy of the antenna must be about 4 arc minutes over the scanning range of the order of 10 degrees. The receiver can be a simple transistor amplifier with a calibrated noise injection in the input line in order to measure the absolute antenna temperature. The main conclusions of the study are applicable to antennas whose diameter varies from 3 to 5 m. Appendices are given which describe: measurement of the absolute radio spectrum of the source and the use of the spectrum for calibration of larger antennas; the measurement of large antennas with cosmic radio sources; radio holographic reflector measurement of the 30 millimeter radio telescope at 22 GHz with a cosmic signal source; and phase retrieval radio holography in the Fresnel region.

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