An Upward Looking Airborne Millimeter Wave Radiometer For Atmospheric Water Vapor Sounding And Rain Detection

J. A. Gagliano; R. H. Platt

doi:10.1117/12.948263

24 October 1985 An Upward Looking Airborne Millimeter Wave Radiometer For Atmospheric Water Vapor Sounding And Rain Detection

J. A. Gagliano, R. H. Platt

Author Affiliations +

Proceedings Volume 0544, Millimeter Wave Technology III; (1985) https://doi.org/10.1117/12.948263
Event: 1985 Technical Symposium East, 1985, Arlington, United States

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.

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J. A. Gagliano and R. H. Platt "An Upward Looking Airborne Millimeter Wave Radiometer For Atmospheric Water Vapor Sounding And Rain Detection", Proc. SPIE 0544, Millimeter Wave Technology III, (24 October 1985); https://doi.org/10.1117/12.948263

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