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Calibration and validation of a set of multi-aspect airborne polarimetric Pi-SAR data

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To implement target reconstruction from multi-aspect SAR data, a simple method of first calibrating multi-aspect data is presented. It requires that at least one aspect is calibrated beforehand, and other aspects are then calibrated with respect to this calibrated aspect. A natural object, such as flat bare ground, is usually chosen as a reference target, and is expected to preserve identical scattering for all aspects. Thereafter, the channel imbalance factors are estimated from the distribution of the phase difference and amplitude ratio of co-polarized, hh and vv, echoes of the reference target, and are then used to compensate the whole SAR images. This approach was applied to the calibration of four-aspect airborne Pi-SAR (Polarimetric and Interferometric Synthetic Aperture Radar) data for target reconstruction. Based on the same principle, another potential application is calibration of descending (ascending) data using the calibrated ascending (descending) data.
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Document Type: Research Article

Affiliations: Key Laboratory of Wave Scattering and Remote Sensing Information (Ministry of Education), Fudan University, Shanghai 200433, PR China

Publication date: December 1, 2008

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