一种PS选点方法的GB-SAR边坡监测数据处理应用  

Application of a permanent scatterers selection method in GB-SAR slope monitoring data processing

作　　者：王军飞[1] 刘东烈 汪雯雯 肖慎轲 彭军还[1] WANG Junfei;LIU Donglie;WANG Wenwen;XIAO Shenke;PENG Junhuan(China University of Geosciences(Beijing),Beijing 100083,China;Guizhou Provincial First Institute of Surveying and Mapping(Guizhou BeiDou Navigation Location Service Center),Guiyang 550000,China;Key Laboratory of Coal Geological Geophysical Exploration Surveying&Mapping Institute of Shanxi Province,Jinzhong,Shanxi 030600,China)

机构地区：[1]中国地质大学(北京),北京100083 [2]贵州省第一测绘院(贵州省北斗导航位置服务中心),贵阳550000 [3]山西省煤炭地质物探测绘院重点实验室,山西晋中030600

出　　处：《测绘科学》2020年第12期108-115,共8页Science of Surveying and Mapping

摘　　要：针对地基合成孔径雷达对矿区边坡进行连续监测所获取的数据和星载合成孔径雷达数据特性不同的问题,该文分析了传统的永久散射体(PS)选取方法在地基数据处理中的适用性,并提出了一种新的PS点选取方法,即相邻景干涉相位极限误差剔除法。该方法认为在相邻影像很短的时间基线(小于2 min)内,测区大气状态变化极其微小,且没有发生形变,那么在相邻景干涉相位图中,PS点的干涉相位值是数学期望为0的随机变量。用相干系数法初选PS点,求出初选PS点在相邻景干涉图中相位值的中误差,剔除超过极限误差的点,逐景进行相同操作,得到终选PS点。使用首云铁矿边坡的监测数据进行实验,结果表明,新方法在选点密度和稳定性方面效果较好,具有实用性。In view of the difference between the data obtained by ground-based synthetic aperture radar(SAR)and spaceborne SAR,the applicability of the commonly used method of selecting permanent scatterer(PS)in ground-based data processing was analyzed,and a new method of PS point selection was proposed,i.e.the interference phase limit error elimination method of adjacent scenes.This method considered that in the short time baseline(less than 2 minutes)of adjacent images,the change of atmospheric state in the survey area was extremely small,and there was no deformation.Then,in the interferogram of adjacent scenes,the interference phase value of PS point was a random variable with mathematical expectation of 0.The PS candidate points were selected by the coherence coefficient method,and the mean square error of the phase value of the PS candidate points in the adjacent scene interferogram was calculated.The points exceeding the limit error were eliminated,and the final selected PS points were obtained by performing the same operation one by one.The monitoring data of Shouyun iron mine slope were used for the experiment,the results showed that the new method had a good effect in the selection of density and reliability,and was practical.

关 键 词：边坡 地基合成孔径雷达 永久散射体 中误差 极限误差 

分 类 号：P237[天文地球—摄影测量与遥感]