DocumentCode :
1009474
Title :
DEM Reconstruction Accuracy in Multichannel SAR Interferometry
Author :
Ferraiuolo, Giancarlo ; Meglio, Federica ; Pascazio, Vito ; Schirinzi, Gilda
Author_Institution :
Dipt. di Ing. Elettron. e delle Telecomun., Univ. di Napoli Federico II, Napoli
Volume :
47
Issue :
1
fYear :
2009
Firstpage :
191
Lastpage :
201
Abstract :
Interferometric synthetic aperture radar (InSAR) systems allow the estimation of the height profile of the Earth surface. When the height profile of the observed scene is characterized by high slopes or exhibits strong height discontinuities, the height reconstruction obtained from a single interferogram is ambiguous, since the solution of the estimation problem is not unique. To solve this ambiguity and restore the solution uniqueness, multiple interferograms, obtained with different baselines and/or with different frequencies, have to be used (multichannel InSAR). The height profile can then be estimated from multiple interferograms using maximum likelihood (ML) estimation techniques or by means of maximum a posteriori (MAP) estimation techniques, which take into account the relation between adjacent pixels. In this paper, the height estimation accuracy achievable with a given multibaseline interferometric configuration and using the aforementioned estimation techniques in terms of Cramer-Rao lower bound for the ML and of error lower bound for the MAP, is analyzed and discussed. It is shown that the MAP technique outperforms the ML one and that its attainable accuracy is not sensitive to the baselines choice, while mainly depends on the ground slopes.
Keywords :
digital elevation models; geophysical signal processing; geophysical techniques; height measurement; image reconstruction; maximum likelihood estimation; radar imaging; radiowave interferometry; remote sensing by radar; Cramer-Rao lower bound; Earth surface; digital elevation model reconstruction; height discontinuity; height estimation accuracy; height profile estimation; height reconstruction; interferometric synthetic aperture radar systems; maximum a posteriori estimation; maximum likelihood estimation; multibaseline interferometric configuration; multichannel InSAR; multichannel SAR interferometry; Digital elevation model (DEM) reconstruction; statistical estimation; synthetic aperture radar (SAR) interferometry;
fLanguage :
English
Journal_Title :
Geoscience and Remote Sensing, IEEE Transactions on
Publisher :
ieee
ISSN :
0196-2892
Type :
jour
DOI :
10.1109/TGRS.2008.2002644
Filename :
4689342
Link To Document :
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