InSAR技术在矿区沉降监测中的应用研究

THE APPLICATION OF INSAR TECHNOLOGY TO MINING AREA SUBSIDENCE MONITORING

介绍了应用InSAR技术监测矿区地表沉降以及地下开采活动的原理;利用重轨差分InSAR技术获得了峰峰矿区地表ENVISAT和JERS 1的雷达形变干涉相位图;分析了在矿区地表沉降过程中ENVISATC波段和JERS 1 L波段形变干涉相位图的相干特性、相位特性以及干涉测量技术在矿区地表沉降监测中应用的可行性和局限性。实验结果表明,利用C波段和L波段雷达数据可以实施对矿区地表沉降的监测,但是C波段雷达受到空间干涉基线的限制更加严格,如果要实现对矿区地表沉降的监测,需要充分利用每个卫星回访时期的雷达数据,建立长时序的星载雷达形变干涉相位图序列,才能较好地实现矿区地表沉降监测。

Interferometry SAR is an emerging earth observation technique, which is especially useful in cartography and surface subsidence survey. This paper describes the method for monitoring the mining activities using the In- SAR technique. Both ENVISAT ASAR and JERS1 SAR data were used to generate deformation interferograms, Characteristics of coherence as well as phase patterns on the C band and L band deformation interferograms were comparatively studied, and the feasibility and limitation of using InSAR technology in mining area subsidence monitoring were analyzed. The experimental result shows that both C band and L band can accomplish the monitoring of mining area subsidence, but C band has more restricted conditions for its perpendicular baseline. For the purpose of obtaining a satisfactory outcome in mining area subsidence monitoring by using the InSAR method, the time series of SAR images of every visit period and SAR deformation interferograms should be established.