中文摘要：

分析幅度稳定性、相位稳定性、时序相关性及振幅离差阈值等多种Ps点提取方法的特点与缺陷，提出基于时序相关系数阈值与振幅离差阈值并集和交集的Ps点识别策略，给出其相应模型，并实例验证了该方法的有效性与优越性。

英文摘要：

The recognition and selection of high-coherence PS points is a premise that guarantees the high-precision of permanent scatterers. The characteristics and flaws of all kinds of selection methods, such as amplitude stability, phase stability, timing sequence correlation and amplitude dispersion index threshold were analyzed. The recognition strategy of PS points is brought forward based on the union and intersection of time sequence correlation coefficient threshold and amplitude dispersion index threshold. The basic principle of point target check method is expounded and the corresponding model is given, in addition, its effectiveness and superiority is verified.