Generalized functional model of maximum and minimum detectable deformation gradient for PALSAR interferometry

Empirical functional models for the maximum and minimum detectable deformation gradient of PALSAR interferometry were established based on coherence and discrete look numbers. Then, a least square regression method was used to fit the model coefficients and thus obtain the generalized functional models for both coherence and look numbers. The experimental results with ALOS PALSAR data of Wenchuan earthquake of China show that the new model works well for judging whether the deformation gradient can be detected by the D-InSAR technology or not. The results can help researchers to choose PALSAR data and to configure processing parameters, and also benefit the interpretation of the measured surface deformation.

一种修正的Goldstein干涉图滤波方法

干涉图的相位噪声是相干性和视数的函数。因此,一个好的干涉图滤波器应同时考虑相干性和视数的影响。本文对在干涉图滤波中广泛应用的Goldstein滤波器进行改进,通过视数的引入,对滤波器的滤波参数进行修正,大大增强了滤波的自适应性。模拟数据和真实数据的验证说明新的滤波器在滤波效果上有明显的改善,具有更好的稳健性。