针对PSI/DInSAR和Offset-tracking监测矿区地表大形变面临的瓶颈，开展以下三方面的研究：（1）基于点目标的Offet-tracking技术及适用性评价，主要包括点目标的精确提取和自动匹配研究；（2）SAR影像精密配准研究，包括基于稳定区点目标偏移量构建全局配准多项式模型，和基于形变区点目标偏移量构建局部配准纠正模型，恢复SAR影像在地表大形变区域的相干性；（3）联合PSI/DInSAR时序分析技术，修正局部配准纠正模型中距离向偏移量估计对应的地表形变信息，实现对矿区地表形变的高精度监测。通过研究，实现PSI/DInSAR和Offset-tracking深度融合，提高卫星SAR影像相关技术对矿区地表大形变监测的适用性和监测精度。研究成果将为深入开展西部矿区高强度开采地表沉陷规律研究提供技术支撑，对生态脆弱区实现煤炭资源高效开发与生态环境保护协调发展具有重要意义。

Concerning the bottleneck confronted while applying either PSI/DInSAR or Offset-tracking to large deformation monitoring in coal mining area, the research of this proposal will focus on the following three aspects. (1) Point-target-based Offset-tracking technology to improve the estimation efficiency and accuracy in area with low coherence, including point target identification and precisely automatic matching, offset component fitting caused by satellite orbit inconsistency and topography, of which the automatic precise matching between point targets is the key issue; (2) Precise co-registration between SAR images to restore the coherence otherwise lost due to large ground deformation, which consists of global polynomial construction based on the offset estimated with point-target-based Offset-tracking in stable area, and Regional Transformation Model (RTM) derived from the offset estimation in the corresponding deforming area; (3) According to the time-series analysis result from PSI/DInSAR, correct the deformation corresponding to range offset estimation from RTM to acquire the LOS deformation with higher accuracy. The ultimate goal is to realize the deep integration of PSI/DInSAR and offset tracking, so as to enhance the applicability and accuracy of SAR related technology while applied to large deformation monitoring in coal mining area. The achievements should provide technical supports for research on the rule of ground subsidence caused by high intensity coal mining in West China, which is of great importance for the ecologically vulnerable area to coordinate the development between coal resources exploitation and ecological environmental protection.