Page 1ENVISAT Cal/Val Workshop ESRIN 9/13 December 2002 Antenna Elevation Pattern Estimation from Rain Forest Data M. Zink ENVISAT Programme ESA-ESTEC Page 2ENVISAT Cal/Val Workshop ESRIN 9/13 December 2002 Content Estimation Approach Fine-Tuning of VV patterns at ScanSAR sub- swath boundaries HH Beam Patterns VH Beam Patterns HV Beam Patterns Comparison with pre-launch patterns Page 3ENVISAT Cal/Val Workshop ESRIN 9/13 December 2002 Estimation Approach Based on IMP, WSM, (APM) products Range power profile calculated applying simple threshold masking Imaging geometry reconstructed from annotation parameters Re-apply AP corrected in the processor tan( inc ) correction Combined estimate from all available IM+WS products Page 4ENVISAT Cal/Val Workshop ESRIN 9/13 December 2002 WS/VV Range Power Profiles at ECR Approx. 0.5 deg around the beam merging region not used in estimation Over-compensation at beam edges, especially SS1 Page 5ENVISAT Cal/Val Workshop ESRIN 9/13 December 2002 new old Refined VV Patterns (SS1, IS3-IS6) Page 6ENVISAT Cal/Val Workshop ESRIN 9/13 December 2002 WS Profiles after Pattern Refinement Consistent slopes where the beams overlap Absolute levels agree with cal factor from transponders and expected RF o Page 7ENVISAT Cal/Val Workshop ESRIN 9/13 December 2002 Sample Images HH Page 8ENVISAT Cal/Val Workshop ESRIN 9/13 December 2002 Elevation Beam Patterns - HH Standard deviation of estimates