Nature of noise in 2D phase unwrapping

Richard Bamler; Gordon W. Davidson; Nico Adam

doi:10.1117/12.262705

17 December 1996 Nature of noise in 2D phase unwrapping

Richard Bamler, Gordon W. Davidson, Nico Adam

Proceedings Volume 2958, Microwave Sensing and Synthetic Aperture Radar; (1996) https://doi.org/10.1117/12.262705
Event: Satellite Remote Sensing III, 1996, Taormina, Italy

Abstract

This paper reviews the concept of noise in 2D phase unwrapping of SAR interferograms. It is shown that phase gradient estimates derived as wrapped phase differences of adjacent samples are biased, leading to an underestimation of phase slopes. Hence, linear estimators like least squares methods operating on such gradient estimates tend to globally distort the reconstructed terrain. The slope bias is quantified as a function of coherence and number of looks both theoretically and via simulations. The particular type of noise under discussion also may lead to impulse-like errors in the phase unwrapped by a linear method. In order to avoid these errors the support of reconstruction must be restricted in the same way as with so-called branch-cut methods.

Citation Download Citation

Richard Bamler, Gordon W. Davidson, and Nico Adam "Nature of noise in 2D phase unwrapping", Proc. SPIE 2958, Microwave Sensing and Synthetic Aperture Radar, (17 December 1996); https://doi.org/10.1117/12.262705

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