Method of correcting an object-dependent spectral shift in...

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G01S 13/48 (2006.01) G01S 7/41 (2006.01) G01S 13/87 (2006.01) G01S 13/90 (2006.01)

Patent

CA 2229767

A method of correcting an object-dependent spectral shift in radar interferograms has two main procedures. In the first, the phase of the interferogram is reconstructed through phase unwrapping and subsequently smoothed for reducing noise. In the second, the two complex-value radar images intended for forming the interferogram are suitably multiplied by a factor derived from the smoothed phase, and are subsequently low-pass-filtered. The spectral shift dependent on the local inclination of the terrain is thus adaptively corrected and the decorrelation caused by the image geometry is extensively eliminated. Particularly in the region of critical, mountainous terrain, the phase noise drops to a very low level.

Méthode permettant de corriger le décalage spectral dépendant de l'objet dans des interférogrammes radar. Comprend deux procédures. Dans la première, la phase de l'interférogramme est reconstruite par élimination d'ambiguïté (phase unwrapping), puis lissée afin de réduire le bruit. Dans la deuxième, les deux images radar à valeur complexe destinées à former l'interférogramme sont multipliées de la façon voulue par un facteur obtenu à partir de la phase lissée, puis filtrées au moyen d'un filtre passe-bas. Le décalage spectral dépendant de l'inclinaison locale du terrain est ainsi corrigé de manière adaptative et la décorrélation causée par la géométrie de l'image est largement éliminée. En terrain montagneux critique, particulièrement, le bruit de phase tombe à un très bas niveau.

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