Baseline estimation using ground points for interferometric SAR

Baseline estimation is important to generate accurate DEM with SAR interferometry. We often meet problems in calculated baselines from satellite position data. We propose a method to estimate baseline using ground points (GPs) with heights and their interferometric phases. GPs are selected in an amplitude master intensity image, and then interferometric phase of each GP is measured and used to tune baseline. Analysis is done to compare baseline estimation accuracy with the method using tiepoints with heights on both master and slave intensity images. It shows that the proposed method extremely improves accuracy. The example of three JERS-1 SAR datasets demonstrates accuracy of this method.