| With the advantages of All-weather,wide coverage,high accuracy and low cost,Time-Series Interferometric SAR plays an important role in monitoring ground displacement,acquiring the seismic deformation field and the distribution of fault slip,observing the volcanic activities and lots of other crustal deformation phenomena,demonstrating its extraordinary potential for application.Different from the traditional Differential InSAR, the technique of time-series InSAR effectively overcomes the influences of the spatial decorrelation,temporal decorrelation and the atmospheric delay effect, improves the precision and reliability of acquired ground deformation results.However, as the information carrier of ground deformation,highly-coherence point targets mainly distributes in dense areas of buildings and structures,which makes time-series InSAR based on highly-coherence point targets have higher requirements to the actual application environment and can not be realized with high spatial density of ground deformation, seriously affected integrity and continuity of the acquired ground deformation.In order to meet the application needs,this paper aims at analyzing characteristics of highly-coherence distributed targets and merging it into time-series InSAR algorithm to retrieve the ground deformation in high precision.Therefore,this article does the following studies:(1) Based on the basic principles of InSAR technique, the paper analyzes the error sources of Differential InSAR and introduces two main types of time-series InSAR algorithm.(2) The paper points out the key problems in the inversion of the ground deformation by using the distributed targets, and gives concrete solutions.(3) Experiments of merging highly-coherence distributed targets into current time-series InSAR algorithm were carried out, which manifest that inversion of ground deformation with distributed targets and permanent targets is truly a feasible method. |
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