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Precipitation mapping with an airborne synthetic aperture imaging radarUse of an airborne synthetic-aperture radar (SAR) of 3.1-cm wavelength for the detection and mapping of precipitation echoes is described. Difficulties in mapping related to the incoherence of the echoes are discussed; methods of increasing resolution by Doppler filtering are suggested. Observations made with a vertical side-looking SAR system flying above a stratiform storm were found to resemble vertical cross sections obtained with conventional radar showing snow streamers, the bright band and rain. However, the actual section sampled by the SAR after filtering for zero Doppler is shown to depend upon both the relative motion of the particles and the relative winds below the aircraft. Knowledge of the relative winds, deduced from Doppler spectrum variations, and of the particle fall speeds permits the generation of horizontal and vertical cross sections displaced from the aircraft's position.
Document ID
19770063050
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Atlas, D.
(NASA Goddard Space Flight Center Greenbelt, Md.; National Center for Atmospheric Research, Boulder, Colo., United States)
Elachi, C.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Brown, W. E., Jr.
(California Institute of Technology, Jet Propulsion Laboratory, Pasadena Calif., United States)
Date Acquired
August 9, 2013
Publication Date
August 20, 1977
Publication Information
Publication: Journal of Geophysical Research
Volume: 82
Subject Category
Meteorology And Climatology
Accession Number
77A45902
Funding Number(s)
CONTRACT_GRANT: NAS7-100
Distribution Limits
Public
Copyright
Other

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