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Information for space radar designers: Required dynamic range vs resolution and antenna calibration using the Amazon rain forestCalibration of the vertical pattern of the antennas for the SEASAT scatterometer was accomplished using the nearly-uniform radar return from the Amazon rain forest. A similar calibration will be attempted for the SIR-B antenna. Thick calibration is important to establish the radiometric calibration across the swath of the SIR-B, and the developed methodology will provide an important tool in the evaluation of future spaceborne imaging radars. This calibration was made by the very-wide-beam SEASAT scatterometer antennas because at 14.65 GHz the scattering coefficient of the rain forest is almost independent of angle of incidence. It is expected that the variation in scattering coefficient for the rain forest across the relatively narrow vertical beam of the SIR-B will be very small; even at L band the forest should be essentially impenetrable for radar signals, the volume scatter from the treetops will predominate as at higher frequencies. The basic research elements include: (1) examination of SIR-B images over the rain forest to establish the variability of the scattering coefficient at finer resolutions than that of the SEASAT scatterometer; (2) analysis of the variability of SIR-B data detected prior to processing for either azimuth compression or; possibly, range compression so that averages over relatively large footprints can be used; (3) processing of data of the form of (2) using algorithms that can recover the vertical pattern of the antenna.
Document ID
19850008930
Document Type
Reprint (Version printed in journal)
Authors
Moore, R. K. (Kansas Univ. Center for Research, Inc. Lawrence, KS, United States)
Frost, V. S. (Kansas Univ. Center for Research, Inc. Lawrence, KS, United States)
Date Acquired
August 12, 2013
Publication Date
July 1, 1985
Publication Information
Publication: JPL The SIR-B Sci. Invest. Plan
Subject Category
EARTH RESOURCES AND REMOTE SENSING
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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IDRelationTitle19850008899Analytic PrimaryThe SIR-B science investigations plan