Analysis of the Baseline Decorrelation and Critical Baseline of Interferometric SAR

Baseline is a significant concept in the principle of SAR Interferometry. It reflects the inherent characters in the height measuring of InSAR, because it is not only the source of coherence but also the root of baseline decorrelation, and it defines the limitation of InSAR by a critical baseline. In this article, the baseline, the baseline decorrelation, the critical baseline and the relationships among them were analyzed thoroughly. A new concept, named coherent angle, was introduced to make the analysis more precise. The appearances of them both in time domain and image field were also explained.