A multiresolution approach to improve phase unwrapping
- 23 December 2002
- conference paper
- Published by Institute of Electrical and Electronics Engineers (IEEE)
- Vol. 4, 2050-2053 vol.4
- https://doi.org/10.1109/igarss.1996.516885
Abstract
A method is presented for robust phase unwrapping based on instantaneous frequency estimation at multiple resolutions. Estimation is done of the frequency difference between resolution levels, resulting in asymptotically zero bias in the aliasing error. The frequency for the highest resolution level is found by the sum of difference frequencies, and the final frequency estimates are input to a least squares phase reconstruction algorithm. A hierarchical algorithm for frequency estimation at all resolution levels, based on the correlation Doppler centroid estimator, is derived. Also, an adaptive multiresolution approach is presented, in which the highest resolution level required for a frequency estimate without aliasing and thus a smooth phase reconstruction, is determined at each point. The method is investigated by simulations, and results show successful phase unwrapping without slope bias, even in the presence of undersampling and low coherence.Keywords
This publication has 5 references indexed in Scilit:
- 2-D phase unwrapping and instantaneous frequency estimationIEEE Transactions on Geoscience and Remote Sensing, 1995
- Robust two-dimensional weighted and unweighted phase unwrapping that uses fast transforms and iterative methodsJournal of the Optical Society of America A, 1994
- Estimating the Doppler centroid of SAR dataIEEE Transactions on Aerospace and Electronic Systems, 1989
- Satellite radar interferometry: Two‐dimensional phase unwrappingRadio Science, 1988
- Least-squares phase estimation from the phase differenceJournal of the Optical Society of America A, 1988