Interferometric point target analysis (IPTA) eliminates the effects of atmospheric delay to a certain extent in the monitoring of regional surface deformation,so this paper adopts the idea of neighborhood differencing to reduce the auto-correlated phases in the differential interferograms.Delaunay triangulation with distance constraint is used to establish the baseline network between PS points,effectively avoiding long distance baseline and low quality PS points,and an adjacent array model is applied for searching and deleting the repeated baselines in order to improve computation efficiency.Simulated data are used to validate the program and then eight TerraSAR-X images from July 2015 to February 2016 are used to monitor deformation along the Datong-Xi'an high speed railway based on the program.The results show high consistency with the existing ground fissures and field investigation data,proving that the PS baseline network is practicable in deformation monitoring of linear engineering.%针对SAR干涉点目标分析技术在区域地表形变监测中仅能在一定程度上消除大气延迟效应的问题,采用邻域差分的思想来减弱差分干涉相位中的自相关影响.采用附加距离限制的Delaunay三角网进行PS基线网络的布设,可以有效剔除距离较长的基线边和低质量的PS点目标,并利用邻接矩阵对PS基线网络中的重复边进行检测与删除,以提高程序的计算效率.首先利用模拟数据对程序的有效性与正确性进行验证,然后以大同-西安客运专线太谷-祁县段为研究对象,选取2015-07～2016-02的8景TerraSAR数据进行实例分析,获取的高铁沿线形变与已有地裂缝调查资料和野外实地考察资料具有较高的一致性,证明了PS基线网络在线性工程形变监测应用中的可行性.
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