C-band radar backscatter of Baltic sea ice: theoretical predictions compared with calibrated SAR measurements
作者:
L. M. H. ULANDER,
R. JOHANSSON,
J. ASKNE,
期刊:
International Journal of Remote Sensing
(Taylor Available online 1992)
卷期:
Volume 13,
issue 13
页码: 2447-2468
ISSN:0143-1161
年代: 1992
DOI:10.1080/01431169208904281
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
Airborne Synthetic Aperture Radar (SAR) data have been analysed together with in situ measurements of sea ice during the Bothnian Experiment in Preparation for ERS-1 (BEPERS) in March 1988. Based on the physical properties of the snow-covered level ice, a scattering model is used to predict the C-band like-polarization backscattering coefficient in an experiment area. Both the average backscattering coefficient and the SAR image texture were found to be in good agreement with the scattering model predictions. The backscatter signature of the level ice was found to be dominated by the ice surface r.m.s. height and autocorrelation function. These parameters were determined from profiles of the ice surface height, which were measured using a laser profiler device with sub-mm accuracy. The present model is expected to be accurate when the backscattering is dominated by scattering from the cm-scale snow or ice surface roughness.
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