DocumentCode :
1370677
Title :
A novel phase unwrapping method based on network programming
Author :
Costantini, Mario
Author_Institution :
Eur. Space Agency, Frascati, Italy
Volume :
36
Issue :
3
fYear :
1998
fDate :
5/1/1998 12:00:00 AM
Firstpage :
813
Lastpage :
821
Abstract :
Phase unwrapping is the reconstruction of a function on a grid given its values mod 2π. Phase unwrapping is a key problem in all quantitative applications of synthetic aperture radar (SAR) interferometry, but also in other fields. A new phase unwrapping method, which is a different approach from existing techniques, is described and tested. The method starts from the fact that the phase differences of neighboring pixels can be estimated with a potential error that is an integer multiple of 2π. This suggests the formulation of the phase unwrapping problem as a global minimization problem with integer variables. Recognizing the network structure underlying the problem makes for an efficient solution. In fact, it is possible to equate the phase unwrapping problem to the problem of finding the minimum cost flow on a network, for the solution of which there exist very efficient techniques. The tests performed on real and simulated interferometric SAR data confirm the validity of the approach
Keywords :
geophysical signal processing; geophysical techniques; radar imaging; remote sensing by radar; synthetic aperture radar; SAR interferometry; function reconstruction; geophysical measurement technique; global minimization problem; interferometric SAR; land surface; neighboring pixel; network programming; network structure; phase difference; phase unwrapping method; radar imaging; radar remote sensing; synthetic aperture radar; terrain mapping; Costs; Fast Fourier transforms; Functional programming; Interferometry; Performance evaluation; Phase estimation; Robustness; Synthetic aperture radar; Testing; Two dimensional displays;
fLanguage :
English
Journal_Title :
Geoscience and Remote Sensing, IEEE Transactions on
Publisher :
ieee
ISSN :
0196-2892
Type :
jour
DOI :
10.1109/36.673674
Filename :
673674
Link To Document :
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