Baseline estimation using ground points for interferometric SAR

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