InSAR地面沉降监测精度分析与评价

Accuracy Analysis and Evaluation of InSAR Land Subsidence Monitoring

针对InSAR地面沉降监测精度所受到的质疑,以郑州市为研究区,该文提出了在SAR卫星过境获取图像的同时开展水准测量,通过开展地面沉降星地同步观测实验,即利用水准观测结果对InSAR地面沉降监测的精度进行了对比分析与评价。分别于2012年11月、2013年6月、8月,开展了3次同步观测实验,获取了InSAR与同步的水准监测数据,通过统一参考基准,纠正了InSAR、水准两种测量方法测量结果出现的整体偏差;统一参考基准后,最临近距离的平均误差在±1.9mm^4.8mm之间,中误差在±2.3mm^5.6mm之间,采用克里金插值法的平均误差在±1.5mm^3.8mm之间,中误差在±1.9mm^4.6mm之间。结果表明InSAR地面沉降监测具有较高的测量精度。

This paper takes Zhengzhou city as the research area,aiming at the question of InSAR land subsidence monitoring accuracy,then carries out the “land subsidence observation experiment by synchronize satellite and ground”with the way of levelling when SAR satellite captures images.Namely,we analyze and evaluate the InSAR land subsidence monitoring accuracy by utilizing the levelling results.Three synchronize experiments were carried out in August 2012,November 2013 and June 2013,then InSAR and synchronize levelling results were acquired.The whole deviation of InSAR and levelling measurement results were corrected through the unified reference.The average error of the near distance between ±1.9mm^4.8mm and the mean square error between ±2.3mm^5.6mm after the reference been unified.The average error between ±1.5mm^3.8mm and the mean square error between ±1.9mm^4.6mm after applying the kriging interpolation method.Results showed that the InSAR land subsidence monitoring have higher measuring accuracy.