研究目的
Investigating the polarimetric calibration of airborne synthetic aperture radar (SAR) data affected by terrain slopes using a dual-band data fusion technique.
研究成果
The proposed technique is capable of deriving the distortion parameters and performs better than the methods presented in Quegan and Ainsworth et al. It is useful for PolCAL in mountainous areas and for monitoring systems without CRs in long-term operation.
研究不足
The technique's effectiveness in vegetated areas is limited due to different penetration capabilities between X-band and P-band, and the accuracy of co-pol channel imbalance estimation without CRs is not as high as with CRs.
1：Experimental Design and Method Selection:
The technique involves deriving the polarization orientation angle shift (POAS) from X-band interferometry and applying it to P-band fully-polarimetric data, followed by iterative determination of crosstalk and cross-pol channel imbalance using the POAS after dual-band data fusion.
2：Sample Selection and Data Sources:
The study uses data from the CASMSAR system, China’s first airborne SAR mapping system, which operates with dual-band high-resolution SAR sensors.
3：List of Experimental Equipment and Materials:
The CASMSAR system, which includes X-band single-pass cross-track interferometry and P-band fully-polarimetric measurement capabilities.
4：Experimental Procedures and Operational Workflow:
The process includes deriving the POAS, estimating crosstalk and cross-pol channel imbalance iteratively, and evaluating the performance using corner reflectors (CRs).
5：Data Analysis Methods:
The performance of the proposed technique is analyzed and validated by comparison with results from deployed CRs, and the experimental results with four datasets are presented.
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