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Proceedings Paper

Calibration of spaceborne scatterometers using the Amazon tropical rainforest
Author(s): David G. Long; Gary B. Skouson
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Paper Abstract

Spaceborne scatterometers are radar systems designed specifically to measure the normalized radar backscatter coefficient ((sigma) 0) of the ocean's surface in order to determine the near-surface wind vector. Precise calibration of the instrument sensor is required to determine (sigma) 0 accurately (of the order of a few tenths of a dB). Although careful calibration of the instrument is performed before launch, a post-launch calibration must also be performed. Post-launch calibration may be performed using ground stations and/or extended-area natural targets. The most commonly used extended area target has been the Amazon tropical rainforest which exhibits a remarkably high degree of homogeneity in its radar response over a very large area. However, the rainforest does exhibit some spatial and temporal variability. In this paper we present a simple technique for post-launch calibration of spaceborne scatterometer data using tropical rainforests which accounts for the temporal and spatial variability of the forest response. We first illustrate the technique with Seasat scatterometer (SASS) data then apply the technique to ERS-1 Active Microwave Instrument (AMI) scatterometer data. Gains corrections of up to several tenths of a dB are estimated for SASS. ERS-1 data was found to be well calibrated so that no corrections are required.

Paper Details

Date Published: 19 August 1993
PDF: 10 pages
Proc. SPIE 1935, Microwave Instrumentation for Remote Sensing of the Earth, (19 August 1993); doi: 10.1117/12.152609
Show Author Affiliations
David G. Long, Brigham Young Univ. (United States)
Gary B. Skouson, Brigham Young Univ. (United States)

Published in SPIE Proceedings Vol. 1935:
Microwave Instrumentation for Remote Sensing of the Earth
James C. Shiue, Editor(s)

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