AutomaticgeocodingoftheinteferometricSARimages:Geo-InSARsystems / Geocodificação automática de imagens de radar de abertura sintética interferométrico: sistema Geo-InSAR

AUTOR(ES)
DATA DE PUBLICAÇÃO

2000

RESUMO

The generation of high resolution topographic map from airborne InSAR data, involves two processing parts, the Interferometric SAR processing and the InSAR Geocoding. The first part can be done in the automatic mode, because the algorithms involved are efficient and well known. In the second part, the phase calibration is the critical processing step, and the algorithm that has been used to do that is not efficient. The aim of this thesis, is an efficient method to estimate the phase offset, in order to calibrate the interferometric phase, to make the automatic InSAR Geocoding feasible. The proposed method for phase calibration, uses a pair of overlapped interferograms acquired in opposite flight direction. Functions between phase offset and heights for both interferogram are built, in a set of points in the overlapped area. For each point, the offset function of the first interferogram can be interpolated with the corresponding offset function of the second interferogram. This operation can be done for a set of points. The intersection of these interpolated functions, or crossing points, gives the estimated phase offset for both interferograms. The performance of this method has been tested with airborne InSAR data, acquired during the São Francisco mission in Brazil, and comparison of the results using corner reflectors are presented. The proposed method for phase calibration is 20 times faster then the equivalent one, and presents the same results in terms of accuracy. Extensive experimental results are provided, in order to confirm the feasibility of the automatic InSAR Geocoding procedure, using the proposed method for phase calibration. The Digital Elevation Models generated from interferometric phase, calibrated by using control points and also by using the new method, are compared. The automatic InSAR Geocoding process is 3 times faster when the new method for phase calibration is used, instead of the equivalent one. The use of the proposed method for phase calibration, shows that it is possible to decrease the number of the corner reflector in a mapping process, decreasing the cost of this process.

ASSUNTO(S)

geocodificação radar imagery processamento digital de imagens interferometry geometric rectification (imagery) radar de abertura sintética retificação geométrica sar imagens de radar synthetic aperture radar (sar) interferometria

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