Working Paper Article Version 1 This version is not peer-reviewed

Systematic Interferometric Phase Biases and Their Impact on Earth Surface Deformation Monitoring

Version 1 : Received: 16 October 2020 / Approved: 27 October 2020 / Online: 27 October 2020 (15:26:30 CET)
(This article belongs to the Research Topic EUSAR 2020—Preprints)

How to cite: Ansari, H.; De Zan, F.; Parizzi, A. Systematic Interferometric Phase Biases and Their Impact on Earth Surface Deformation Monitoring. Preprints 2020, 2020100558 Ansari, H.; De Zan, F.; Parizzi, A. Systematic Interferometric Phase Biases and Their Impact on Earth Surface Deformation Monitoring. Preprints 2020, 2020100558

Abstract

We scrutinize the reliability of multilooked interferograms for deformation analysis. Designing a simple approach in the evaluation of the accuracy of the estimated deformation signals, we reveal a prominent bias in the deformation velocity maps. The bias is the result of propagation of small phase error of multilooked interferograms through the time series and can sum up to 6.5 mm/yr in case of using the error prone short temporal baseline interferograms. We further discuss the role of the phase estimation algorithms in reduction of the bias and put recommend a unified intermediate InSAR product for achieving high-precision deformation monitoring.

Subject Areas

SAR Interferometry; Accuracy; Big Data; Deformation Monitoring, Sentinel-1; Fading Signal; Signal Decorrelation

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