Computer Science
Scientific paper
Jun 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004esasp.550e..17d&link_type=abstract
Proceedings of the FRINGE 2003 Workshop (ESA SP-550). 1-5 December 2003, ESA/ESRIN, Frascati, Italy. Editor: H. Lacoste. Publish
Computer Science
Scientific paper
Combination of several interferograms of a same area, each having its own ambiguity of altitude, allows producing a combined interferogram with either a better signal to noise ratio or a lower ambiguity of altitude, unreachable from a single interferometric pair. InSAR baseline combination by summation of interferograms allows reaching peculiar equivalent baselines while increasing signal to noise ratio in the resulting interferogram. Despite this drawback such combination revealed to be highly useful in atmospheric artifacts identification and localization. Choosing adequately the interferograms to combine allow to generate interferograms with very short baseline in which the topographic phase component can be neglected, revealing artifacts before going further in a then useless processing. Baseline combination by averaging can only be applied on unwrapped phases. Therefore, each interferogram must be unwrapped prior to combination. We thus implemented a three step phase unwrapping procedure allowing to take fully advantage of an interferometric data set containing several InSAR pairs of a given site. Phase averaging allows to lower substantially the phase standard deviation and thus to increase the altitude accuracy. Baseline combination process was developed in the frame of an ESA DUP project [1] and of a TELSAT IV project [2].
Derauw D.
Orban Anne
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