Die interferometrische Verarbeitung von SAR-Daten des ERS-1

The study describes new numerical methods and algorithms for the interferometric processing of ERS-1 SAR data. With regard to the improvement of the signal-to-noise ratio of the interferometric phase a method for a phase preserving, subpixel accurate image registration of complex SAR data is presented. Furthermore, spectral filter techniques are developed to suppress decorrelation effects caused by imaging geometry. Regarding the phase contribution of the 'flat earth' the interferogram is geometrically corrected using an automated procedure which is based on the exact estimation of the changeable imaging geometry using precise orbit data and the consideration of the local earth ellipsoid as a reference plane. Based on the 'residues' algorithm an efficient integration method is developed for the estimation of the absolute phase which additionally uses the intensity and coherence information to avoid an integration in image sections without significant phase values. The valuable use of the coherence analysis technique for the detection of temporary changes in geophysical surface parameters and the measuring method are demonstrated for a flooded region caused by a high tide in the river Rhein. (orig.)SIGLEAvailable from TIB Hannover: RN 437(95-28) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekDEGerman