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TitleAbsolute Radiometric Calibration of the CCRS SAR
AuthorUlander, L M H; Hawkins, R K; Livingstone, C; Lukowski, T I
SourceIEEE Transactions on Geoscience and Remote Sensing (Institute of Electrical and Electronics Engineers) vol. 29, issue 6, 1991 p. 922-933,
Alt SeriesEarth Sciences Sector, Contribution Series 20041433
Alt SeriesRESORS 1084625
PublisherInstitute of Electrical and Electronics Engineers (IEEE)
Mediapaper; on-line; digital
File formatpdf
SubjectsScience and Technology; radar methods; remote sensing; radiometric surveys, airborne; radar imagery; C-band; Synthetic Aperture Radar
AbstractDetermining the radar scattering coefficients from SAR (synthetic aperture radar) image data requires absolute radiometric calibration of the SAR system. The authors describe an internal calibration methodology for the airborne Canada Centre for Remote Sensing (CCRS) SAR system, based on radar theory, a detailed model of the radar system, and measurements of system parameters. The methodology is verified by analyzing external calibration data acquired over a six-month period in 1988 by the C-band radar using HH polarization. The results indicate that the overall error is +or-0.8 dB (1 sigma ) for incidence angles +or-20 degrees from antenna boresight. The dominant error contributions are due to the antenna radome and uncertainties in the elevation angle relative to the antenna boresight.

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