An adaptive DEM reconstruction method for multi-frequency InSAR systems

An adaptive DEM (Digital Elevation Model) reconstruction method is proposed for multi-frequence InSAR systems, which is based on generalized pixel model and CSSM (Coherent Signal Subspace Method). The essence of the method is to transform the correlation matrices at many frequency bins into one general correlation matrix at one focusing frequency by using a transformation matrix (focusing matrix), then to estimate the elevation by subspace projection. The method can provide an accurate estimation of the height even if the coregistration error reaches one pixel. The effectiveness and robustness of the method is verified by SIR-C real data.