A Feasible Approach for Improving Accuracy of Ground Deformation Measured by D-InSAR

D-InSAR is currently one of the most popular research tools in the field of Microwave Remote Sensing. It is unrivaled in its aspect of measuring ground deformation due to its advantages such as high resolution,continuous spa-tial-coverage and dynamics. However,there are still a few major problems to be solved urgently as a result of the intrin-sic complexity of this technique. One of the problems deals with improving the accuracy of measured ground deforma-tion. In this paper,various factors affecting the accuracy of ground deformation measured by D-InSAR are systemati-cally analyzed and investigated by means of the law of measurement error propagation. At the same time,we prove that the ground deformation error not only depends on the errors of perpendicular baselines as well as the errors of the inter-ferometric phase for topographic pair and differential pair,but also on the combination of the relationship of perpen-dicular baselines for topographic pairs and differential pairs. Furthermore,a feasible approach for improving the accu-racy of measured ground deformation is proposed,which is of positive significance in the practical application of D-InSAR.

真空—堆载联合预压法在软土地基处理中的应用研究

通过现场测试试验,初步揭示真空—堆载联合预压引起的地基垂直和侧向变形机理,并分析孔隙水压力的消散规律。由于这种软土地基处理方式对于提高路基稳定性、加快工程施工、缩短施工工期、加快软土地基固结、减少工后沉降等方面有着良好的作用,因此对这次试验进行的分析总结有助于真空一堆载联合预压法在我国高速公路软土地基处理中的推广应用。