Computer Science
Scientific paper
Mar 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003esasp.526e..13r&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
The Doppler Centroid frequency is an important instrument characterisation and key processing parameter. High Doppler estimation accuracy is needed to meet the radiometric requirements of ASAR products, and particularly for burst-mode data (ScanSAR and AP modes). On these modes, an error in the fine Doppler Centroid frequency introduces a radiometric banding error due to miss-application of descalloping functions. To ensure that no radiometric or geometric errors are introduced by incorrect Dopple estimated, the requirements on the measurements of Doppler Centroid frequency are very strong for ASAR products: for non-burst mode data the Doppler estimation error shall be less than 50 Hz, for burst mode data (AP, WS, GM) the Doppler estimation error shall be less than 25 HZ, which corresponds to +/- 0.2dB scalloping error. This paper summarised the different Doppler estimation algorithms used in PF-ASAR for the different modes, how this information appears on the ASAR products and provides a first comparisons between measured and expected Doppler as well as a preliminary estimation of the in-flight antenna miss-pointing based on wave mode data products.
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