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Proceedings Paper

An Upward Looking Airborne Millimeter Wave Radiometer For Atmospheric Water Vapor Sounding And Rain Detection
Author(s): J. A. Gagliano; R. H. Platt
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Paper Abstract

A 90/180 GHz multichannel radiometer is currently under development for NASA's 1985 Hurricane Mission onboard the Convair 990 research aircraft. The radiometer will be a fixed beam instrument with dual corrugated horns and a common lens antenna designed to operate simultaneously at 90 and 180 GHz. The all solid state front-end will contain three double side band data channels at 90 ± 3 GHz, 180 + 3 GHz, and 180 ± 7 GHz. These frequencies are chosen to coincide with those proposed for the Advanced Moisture Sounding Unit (AMSU) radiometer which is scheduled for future orbital deployment onboard a Tiros-N satellite. The airborne radiometer will mount in a window port on the CV-990 and will maintain a fixed beam view approximately 14 degrees off zenith. Primary scientific interests for this instrument are the gathering of atmospheric humidity data near the water vapor absorption line of 183.35 GHz and the collection of atmospheric precipitation signatures at 90 GHz. The radiometer design is a Dicke chopper arrangement selected to achieve maximum absolute temperature accuracy and minimum brightness temperature sensitivity. In addition, the instrument will be self-calibrating with built-in temperature controlled calibration loads. Analog outputs of the three data channels will be calibrated DC voltages representing the observed radiometric brightness temperatures over the selected integration time.

Paper Details

Date Published: 24 October 1985
PDF: 6 pages
Proc. SPIE 0544, Millimeter Wave Technology III, (24 October 1985); doi: 10.1117/12.948263
Show Author Affiliations
J. A. Gagliano, Georgia Institute of Technology (United States)
R. H. Platt, Georgia Institute of Technology (United States)

Published in SPIE Proceedings Vol. 0544:
Millimeter Wave Technology III
James C. Wiltse, Editor(s)

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