Baseline modelling for ERS-1 SAR interferometry

An automated system for generating interferograms is presented, including coarse and fine registration, calculation of the interferogram, baseline estimation, and planar phase removal. Adaptive filtering, phase unwrapping, and baseline estimation are then performed to calculate the height model. Methods for the precise estimation of the interferometric baseline using ground control points are presented, and height residuals are compared. Test results are tabulated for an ERS-1 scene pair acquired over the Bonn area in Germany during March 1992. Of the methods tried, a three parameter iterative non-linear least squares procedure produces the best baseline model for use in generating digital elevation models