研究目的
To present a Range-Dependent Time Minimum Variance Distortionless Response (RDTMVDR) Beamformer and apply it to EcoSAR flight data during post-processing for RFI suppression.
研究成果
The RDTMVDR yielded a good improvement of the image quality, shifting the histogram peak from 0.48 to 0.62, demonstrating effective RFI suppression.
研究不足
The RFI removal is blind to interferers inside the swath, and the blind-spot is reduced but not eliminated by the range-dependent estimation.
1:Experimental Design and Method Selection:
The RDTMVDR Beamformer is designed to adaptively change the antenna pattern for each range line to increase RFI suppression.
2:Sample Selection and Data Sources:
EcoSAR flight data acquired on March 30th 2014 over Corcovado National Park in Costa Rica is used.
3:List of Experimental Equipment and Materials:
EcoSAR, a multi-channel architecture SAR system capable of digital beamforming.
4:Experimental Procedures and Operational Workflow:
The INC matrix is estimated for each range line after range compression to reduce the blind-spot of the mitigation process.
5:Data Analysis Methods:
The performance is compared using the interferometric coherence before and after RFI filtering.
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