双轨DInSAR矿区地面沉降监测能力分析
Analysis of Ground Subsidence Monitoring Capability of Double-track DInSAR Mining Area
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摘要: 利用双轨DInSAR及GIS空间分析工具对郭屯煤矿4景C波段Sentinel-1A SAR影像进行精细处理,获取该煤矿2015-11-27—2016-03-02期间的矿区地面沉降情况;与矿区工作面以及同时期水准监测数据进行定性和定量对比分析,提出一种新的DInSAR与水准监测结果对比分析验证方法,解决DInSAR与水准监测时间不一致的问题,然后综合利用相对误差与绝对误差对DInSAR地面沉降监测精度进行验证,避免仅通过绝对误差验证DInSAR结果时出现的弊端。结果表明:C波段双轨DInSAR能实时监控由于地下开采以及采空区残余形变引起的地面沉降,其监测的沉降位置及范围与矿区实际开采工作面相符,且沉降变化趋势与工作面开采进度一致;相干性较高的情况下,DInSAR技术在空间上可以准确探测出与水准监测相符的地面沉降变化情况,监测精度可达cm级。Abstract: The dual-track DInSAR and GIS spatial analysis tools are used to exactly process four scenes C-band Sentinel-1A SAR images of Guotun Coal Mine, obtaining the ground subsidence during 2015-11-27 to 2016-03-02; based on qualitative and quantitative comparison with working face and simultaneous leveling data, a new method for comparative analysis of DInSAR and leveling results is proposed to solve the inconsistency between DInSAR and level monitoring time, then, relative error and absolute error are comprehensively used to verify the accuracy of DInSAR ground subsidence monitoring, so as to avoid the disadvantages of verifying DInSAR results only through absolute error. The results show that C-band dual-track DInSAR can monitor the ground subsidence caused by underground mining and residual deformation of goaf in real time, and the monitored subsidence position and scope are consistent with the actual mining face, and the subsidence change trend is consistent with the mining progress of the face. In the case of high coherence, DInSAR technology can accurately detect ground subsidence changes consistent with level monitoring in space, with monitoring accuracy up to cm level.
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Keywords:
- dual-track DInSAR /
- mining area /
- ground subsidence /
- relative error /
- monitoring accuracy
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