1)School of Resources and Safety Engineering of Central South University, Changsha 410083;2)Hunan Key Laboratory of Clean Coal Resources Utilization and Mine Environment Protection, Hunan University of Science and Technology , Xiangtan 411201;3)GNSS Engineering Research Center, Wuhan University, Wuhan 430079
Abstract：The recognition and selection of highcoherence PS points is a premise that guarantees the highprecision 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.
