Computer Science
Scientific paper
Mar 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003esasp.526e..17h&link_type=abstract
Proceedings of CEOS Working Group on Calibration / Validation - SAR WORKSHOP (ESA SP-526). 24-26 September 2002, London, United
Computer Science
Scientific paper
Interferometric data processing requires careful calibration and validation of the complex input products. Interferometric calibration comprises geometric and phase accuracy aspects. With respect to geometry, orbit and timing parameter have to be calibrated in order to allow accurate geo-coding and optimal processing of the interferometric products. Phase accuracy of the input complex products is an important prerequisite for the interferometric measurement technique. This paper describes methods for location accuracy determination and reports the preliminary results obtained during the ongoing calibration/ validation phase of ENVISAT/ASAR. The paper includes the first ENVISAT/ASAR interferogram over Berlin, Germany. It was obtained with DLR~@~Ys interferometric processor GENESIS. This interferogram is compared to the result from ERS-2 for the same season of year. In addition, for verification of timing parameters two methods are described in this paper. The conventional method relies on precisely known ground control points (transponders or corner reflectors) and compares predicted and measured position in the slant range co-ordinate system. The new method relies on the precisely known geometry of ERS and a strong target visible in the ERS and ENVISAT/ASAR data. This cross-calibration method only requires a coarse height estimate of the considered target. Both methods are used to derive preliminary results for the location accuracy of ENVISAT/ASAR.
Eineder Michael
Holzner J.
Schättler B.
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