Freeman-Durden Decomposition with Oriented Dihedral Scattering
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摘要: 该文首先考察了当极化SAR 方位向与农作物种植行向不一致时,入射电磁波到地表、农作物的二次散射与一般二次散射的区别。其次,为描述这种二次散射,建立了有取向的二面角散射模型,并将该模型引入到Freeman-Durden 目标分解中,设计了相应的目标分解算法。最后,选取同一农作物种植区两种航迹的机载全极化SAR 数据实现了该分解算法。实验结果证明,对于农作物种植区,改进后的Freeman-Durden 分解能提升不同航迹下的极化SAR 数据目标分解的一致性。
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关键词:
- 合成孔径雷达(SAR) /
- 极化 /
- 极化目标分解 /
- 二面角散射
Abstract: In this paper, when the azimuth direction of polarimetric Synthetic Aperature Radars (SAR) differs from the planting direction of crops, the double bounce of the incident electromagnetic waves from the terrain surface to the growing crops is investigated and compared with the normal double bounce. Oriented dihedral scattering model is developed to explain the investigated double bounce and is introduced into the Freeman-Durden decomposition. The decomposition algorithm corresponding to the improved decomposition is then proposed. The airborne polarimetric SAR data for agricultural land covering two flight tracks are chosen to validate the algorithm; the decomposition results show that for agricultural vegetated land, the improved Freeman-Durden decomposition has the advantage of increasing the decomposition coherency among the polarimetric SAR data along the different flight tracks.
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