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

Konferenz: EUSAR 2021 - 13th European Conference on Synthetic Aperture Radar
29.03.2021 - 01.04.2021 in online

Tagungsband: EUSAR 2021

Seiten: 6Sprache: EnglischTyp: PDF

Ansari, Homa; De Zan, Francesco; Parizzi, Alessandro (German Aerospace Center (DLR)-Remote Sensing Technology Institute (IMF), Germany)

In this work we scrutinze 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 significant reduction of the bias and put forward the idea of a unified intermediate InSAR product for achieving high-precision deformation monitoring.