多维层析SAR吴哥遗产地形变监测研究

As one of the most famous world cultural heritage sites, Angkor site has been suffered from extensive damage due to natural and human-induced factors. Angkor is unique for its large-scale ancient temples with complex structures, shown as “layover” signals in high resolution SAR data. The project plans to use MD-TomoSAR (Multi-Dimensional SAR Tomography) to carry out deformation monitoring study of Angkor. First, a deformation phase model will be established based on the analysis of the features of the archaeological site and its surroundings; Second, considering the heavy effect of atmosphere phase screen (APS) , the dense vegetation covered in the whole area and the uneven distribution of ancient buildings, a MD-TomoSAR method based on a multi-step network construction is put forward for robust detection of single and double persistent scatterers, with no need for preliminary removal of APS. Finally, the contributing factors and spatio-temporal process of deformation will be analyzed according to the results of deformation monitoring study of Angkor. Furthermore, a scientific proposal based on the study will be provided for the conservation and sustainability of Angkor site.

受自然与人为因素影响，吴哥古迹坍塌和裂变现象严峻。吴哥古建筑结构复杂、规模宏大，在高分辨SAR图像上存在显著的“叠掩”现象。本课题拟采用多维层析SAR(Multi-Dimensional SAR Tomography, MD-TomoSAR)方法开展吴哥遗产地的形变监测研究：首先，根据遗产地本体及其赋存环境特性，分析吴哥遗产地形变影响因素，建立关键驱动因子的多元形变模型；然后，针对研究区域大气延迟效应显著、植被覆盖密集和建筑群稀疏且空间分布不均匀的特性，提出基于二次二级构网模式的单、双永久散射体提取方法，并建立邻近单永久散射体的相位差分模型，避免提前估计大气相位，扩大形变监测范围，提高参数估计精度；最后，结合相关辅助数据，根据形变反演结果定量阐明近十年尺度吴哥遗产地形变成因和时空演变过程，为吴哥遗产地的保护和可持续发展提出科学建议。

受自然与人为因素影响，吴哥古迹坍塌和裂变现象严峻。吴哥古建筑结构复杂、规模宏大，在高分辨SAR图像上存在显著的“叠掩”现象。本课题采用多维层析SAR(Multi-Dimensional SAR Tomography, MD-TomoSAR)方法开展吴哥遗产地的形变监测研究：首先，根据遗产地本体及其赋存环境特性，分析吴哥遗产地形变影响因素，建立关键驱动因子的多元形变模型；然后，针对研究区域大气延迟效应显著、植被覆盖密集和建筑群稀疏且空间分布不均匀的特性，提出基于二次二级构网模式的单、双永久散射体提取方法，并建立邻近单永久散射体的相位差分模型，避免提前估计大气相位，扩大形变监测范围，提高参数估计精度；最后，结合相关辅助数据，根据形变反演结果定量阐明近十年尺度吴哥遗产地形变成因和时空演变过程，为吴哥遗产地的保护和可持续发展提出科学建议。