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TitleSpaceborne SAR Calibration: Selected Studies (extended abstract)
AuthorLukowski, T I; Hynna, K M; Hawkins, R K; Cloutier, C
Source17th Canadian Symposium on Remote Sensing, Saskatoon, Saskatchewan, June 13-15; 1995 p. 363
Alt SeriesEarth Sciences Sector, Contribution Series 20042602
AbstractCalibration requirements for spaceborne SAR imagery are becoming more stringent as the quantitative use of SAR imagery increases. This is a critical issue for RADARSAT as the SAR system will provide relatively calibrated C-band HH polarized SAR data products to users. Studies of essential parameters in calibration are being carried out at CCRS based on data from existing spaceborne SARs, but accounting for the difference between these SARs and RADARSAT.

One of the critical calculations in the radiometric calibration process is the derivation of the antenna pattern in elevation. Various determinations of antenna patterns have been examined. These methods have been compared using test forest imagery obtained by the ERS-1 SAR. Maximal variations on the order of .4 dB have been obtained when comparing these antenna patterns to those obtained by ESA. Various diffuse natural targets (for use in antenna pattern determination) available within the data reception circles of the Canadian Data Reception Facilities have been examined. Results have been compared to those obtained using the stable Brazilian rainforests (which are the traditional targets of known radar backscatter).

Ongoing studies are being carried out examining other critical parameters in the calibration process. Significant results from these studies will also be presented.


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