PSDInSAR的永久散射体时序选择方法

The PS Selection Method Using Temporal Information in PSDInSAR Technique

已有永久散射体(PS)识别技术均侧重于利用时序数据集的统计特性,而没有考虑到数据集的时序特性,这样的处理方式势必带来时序信息的浪费,造成部分PS点的漏选。该文重点关注一种永久散射体具有较好的相位稳定度但却在整个监测时间内不连续,称这种PS点为类永久散射体点。文中对类永久散射体的概念及特征进行了详细描述,利用仿真实验分析了类永久散射体应用的可行性,根据类永久散射体特性对其进行了有效选择,形成一种新的永久散射体选择方法——时序选择法。同时对时序选择法以天津地区Envisat ASAR影像数据进行实验验证。通过类永久散射体的选择,PS点数量提高了、不均匀分布特性得到改善,同时保证了其较高的相干性。

PS（Permanent Scatters） selection methods mostly used points＇ statistic characteristics as criteria,which of course ignores temporal information of the data sets,some good permanent scatterers may also be ignored.This paper is focused on quasi permanent scatterers,which have good stability during the whole monitoring period except for a short time disturbance.After introducing the concept of quasi permanent scatterers,its character is simulated,the method of choosing it then formed,which is called PS temporal selection method.Then this method is applied to Envisat ASAR data in Tianjin area.With quasi permanent scatterers＇ help,the number of PS points increase and distribute evenly,keeping high coherence at the same time.