A new method for estimating unambiguous phase observations of re-identified coherent targets for multi-baseline InSAR techniques

摘要

In order to improve the density of multi-baseline differential interferometric synthetic aperture radar (DInSAR) measurements, a coherent target re-identification process is required to be carried out. After this process, the number of coherent targets may remarkably increase, which is harmful to subsequent phase unwrapping process. In this letter, a new method is proposed to estimate unambiguous phase observations of additional coherent targets. Unlike that the traditional method conducts phase unwrapping in a global sense, it retrieves unambiguous phase observations independently. Thanks to this nature, the proposed method can be implemented in parallel and can effectively suppress phase unwrapping tiling artifacts. Using Sentinel-1 data, the efficiency and the effectiveness of the proposed method is confirmed.