Method for iterative disk masking and automatic error repair for phase unwrapping
First Claim
1. A method of phase unwrapping of the interferogram of two synthetic radar images of the same area comprising:
- means for applying local circular or elliptical masks centered on the phase residues;
means for automatically detecting phase unwrapping errors during the unwrapping process;
means for stopping and restarting the phase unwrapping process;
means for cleaning the image at any stage in the process; and
means for increasing and decreasing the local mask size as required.
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Abstract
Disclosed is a new alternative method for the phase unwrapping of the interferogram of two SAR (Synthetic Aperture Radar) images of the same area. This new method uses an iterative approach to the phase unwrapping problem by applying local circular or elliptical masks centered on the phase residues. A phase unwrapping error is detected automatically during the unwrapping process by comparing each unwrapped value with neighboring unwrapped values. This new method for phase unwrapping significantly improves the quality of unwrapped phase maps. This will allow extraction of quantitative information such as height and deformation from interferometric SAR measurements. This is significant for the routine application of SAR interferometry in fields like digital elevation mapping and large scale deformation mapping.
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Citations
5 Claims
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1. A method of phase unwrapping of the interferogram of two synthetic radar images of the same area comprising:
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means for applying local circular or elliptical masks centered on the phase residues; means for automatically detecting phase unwrapping errors during the unwrapping process; means for stopping and restarting the phase unwrapping process; means for cleaning the image at any stage in the process; and means for increasing and decreasing the local mask size as required. - View Dependent Claims (2, 3, 4, 5)
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Specification