Analysis of the Elements of Baseline Estimation of Interferometric SAR

Baseline is a key parameter in the theory of the interferometric synthetic aperture radar (InSAR). The baseline makes image pairs correlative. However it is also one of the sources which makes them decorrelation. So it is important to understand the baseline exactly. And it is also the basis of mastering InSAR theory and relevant image processing. In the condition of accepted DEM error, there must be an optimal baseline which makes DEM precision best. This article mainly discusses several concepts concerning baseline, such as decorrelation, critical and optimal baselines etc. Besides the relationships among them are mentioned too. Furthermore the optimal baseline model is established. Finally, The validation of the model via test is demonstrated.