Title :
A PS-based approach for the calilbration of spaceborne polarimetric SAR systems
Author :
Iannini, L. ; Guarnieri, A. Monti
Author_Institution :
Dipt. di Elettron. e Inf., Politec. di Milano, Milan, Italy
Abstract :
The paper debates an external calibration approach based on the stable natural targets, namely Permanent Scatterers (PS), that can be spotted in the illuminated frame. The method, hereby called PolPSCal, allows for relative calibration of the full 4 by 3 polarimetric distortion matrices (PDMs) affecting the stack images. The algorithm is neither constrained to a particular PDM model (thus its implementation is practically feasible for any SAR sensor) nor to any external information. These latter are eventually demanded afterwards in order to normalize the returned PDM stack to an absolute reference. The PolPSCal mathematical framework is reported, and a performance analysis with concern to the PS detection and the PDM estimates accuracy is carried out on both synthetic data and a 29 images RADARSAT-2 dataset.
Keywords :
calibration; electromagnetic wave scattering; matrix algebra; radar cross-sections; radar imaging; radar polarimetry; synthetic aperture radar; PolPSCal; RADARSAT-2 dataset; external calibration; permanent scatterer; polarimetric distortion matrices; spaceborne polarimetric SAR system calilbration; stable natural target; stack image; Calibration; Estimation; Nickel; Stability analysis; Synthetic aperture radar; Thyristors; Permanent Scatterers; Polarimetric Calibration; Synthetic Aperture Radar;
Conference_Titel :
Geoscience and Remote Sensing Symposium (IGARSS), 2012 IEEE International
Conference_Location :
Munich
Print_ISBN :
978-1-4673-1160-1
Electronic_ISBN :
2153-6996
DOI :
10.1109/IGARSS.2012.6350599