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TitleRADARSAT Antenna Pattern Determination
AuthorLukowski, T I; Hawkins, R K; Cloutier, C; Wolfe, J; Teany, L; Srivastava, S K; Banik, B; Jha, R; Adamovic, M
SourceInternational Symposium, Geomatics in the Era of RADARSAT (GER'97), Ottawa, Canada, May 25-30; 1997 p. 6
Alt SeriesEarth Sciences Sector, Contribution Series 20042215
AbstractThe determination of the antenna gain patterns in elevation for RADARSAT is critical to the radiometric calibration of imagery produced by this system. The shapes of the antenna patterns in elevation were derived from imagery of the South American rain forests of Brazil and Colombia with a consistency on the order of ±0.2 dB. The absolute levels of the patterns have been determined by superposing the shapes on results from a set of precision radar ground targets known as the RADARSAT Precision Transponders. The tolerances on the absolute and relative calibration of the products are limited by spacecraft attitude knowledge. Near the edges of the swath, where the antenna patterns fall off rapidly, the uncertainty in attitude dominates the radiometric error budget. As pattern revisions are determined, they are included operationally in the determination of the corrections that are required in the Canadian Data Processing Facility to create radiometrically calibrated image products.

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