中国激光, 2020, 47 (3): 0310002, 网络出版: 2020-03-12   

高分三号全极化SAR散射特性分析与精度评价 下载: 909次

Analysis and Accuracy Evaluation of Scattering Characteristics of GF-3 Full-Polarized SAR
作者单位
1 辽宁工程技术大学测绘与地理科学学院, 辽宁 阜新 12300
2 中国科学院空天信息研究院, 北京 100190
摘要
基于H/A/α极化分解方法分析了GF-3全极化合成孔径雷达(SAR)的散射特性,并结合近同时相RADARSAT-2全极化SAR影像,分析了二者典型地物的极化散射特征,提出了基于传统H-α散射特征平面以及改进的类内聚合度和类间离散度的极化测量精度的评价方法。结果表明:GF-3全极化SAR不同地物的极化散射特性明显,三类地物的散射熵和散射角的平均偏差分别约为0.101和6.923,均优于RADARSAT-2(0.132和7.206)。根据H-α散射特征平面评价方法可知,GF-3与RADARSAT-2全极化SAR的总体极化精度相近,均约为0.7。根据类内聚合度和类间离散度联合因子评价方法可知,GF-3下三类典型地物的联合因子ρcs分别为85.34(水体)、28.99(建筑物)和122.72(植被),与RADARSAT-2的观测结果相近。另外,对不同散射机制的地物类型进行特征分析后发现,GF-3全极化SAR共极化通道观测精度与RADARSAT-2相近,但交叉极化通道观测精度略差于RADARSAT-2。
Abstract
Herein, the scattering characteristics of GF-3 full-polarization SAR (synthetic aperture radar) images were evaluated based on H/A/α polarization decomposition method, and the polarization characteristics of typical ground features in GF-3 and RADARSAT-2 full-polarization SAR images were analyzed. Evaluation method of polarization measurement accuracy based on traditional H/α characteristic scattering plane and improved intra-class aggregation and inter-class dispersion were proposed. Results show that the polarization scattering characteristics of GF-3 full-polarization SAR are clearly for different types of surface features. The average deviations of scattering entropy and scattering angle of three types of surface features are approximately 0.101 and 6.923, respectively, which is better than that of RADARSAT-2 (0.132 and 7.206, respectively). Based on the evaluation method of H/α characteristic scattering plane, the overall polarization accuracy of GF-3 and RADARSAT-2 polarimetric SAR is similar, both of which are approximately 0.7. According to the combined factors of intra-class aggregation and inter-class dispersion, the combined factors of GF-3 are 85.34 (water bodies), 28.99 (buildings), and 122.72 (plants). The recognition ability of GF-3 full-polarization SAR images for these three typical features is similar to that of RADARSAT-2. Furthermore, we analyze the characteristics of ground features with different scattering mechanisms and find that the co-polarization measurement accuracy of GF-3 full-polarization SAR is similar to that of RADARSAT-2 but the cross-polarization channel accuracy is slightly worse than that of RADARSAT-2.

李佳慧, 王晓晨. 高分三号全极化SAR散射特性分析与精度评价[J]. 中国激光, 2020, 47(3): 0310002. Li Jiahui, Wang Xiaochen. Analysis and Accuracy Evaluation of Scattering Characteristics of GF-3 Full-Polarized SAR[J]. Chinese Journal of Lasers, 2020, 47(3): 0310002.

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