Low-noise interferometer for microwave radiometry

Details Low-noise interferometer for microwave radiometry Low-noise interferometer for microwave radiometry

Jun 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988rsci...59..914t&link_type=abstract

Review of Scientific Instruments (ISSN 0034-6748), vol. 59, June 1988, p. 914-920. NSF-NASA-supported research.

Astronomy and Astrophysics

Astronomy

5

Horn Antennas, Interferometers, Low Noise, Microwave Radiometers, Radio Astronomy, Sis (Superconductors)

Scientific paper

An interferometer for precision measurements in microwave radiometry is proposed which uses two low-noise heterodyne receivers based on SIS tunnel junction mixers in the 40-50-GHz band. The antenna interference pattern has lobes which lead to positive output signals and lobes which give negative output, and the radiometer measures the difference in the power from these lobes without beam switching or instrument motion. The present system cancels instrumental signals, has a very low 1/f noise in the output, and has a zero outpus signal when viewing a uniform source. It is noted that application of the interferometer may be limited to radiometry with relatively large beams.

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