InSAR Time Series Analysis of L-Band Wide-Swath SAR Data Acquired by ALOS-2

Liang, C., Z. Liu, E. Fielding, and R. Burgmann (2018), InSAR Time Series Analysis of L-Band Wide-Swath SAR Data Acquired by ALOS-2, IEEE Trans. Geosci. Remote Sens., 56, 4492-4506, doi:10.1109/TGRS.2018.2821150.

Operating at L-band (∼24 cm wavelength) in wide-swath modes is one of the characteristics of the new and next generation satellite synthetic aperture radar (SAR) missions. After 3 years of operation, the Japan Aerospace Exploration Agency Advanced Land Observing Satellite-2 (ALOS-2) satellite has acquired a wealth of L-band wide-swath SAR data over many areas using its ScanSAR mode. We present interferometry SAR (InSAR) time series analysis results from ALOS-2 ScanSAR data. We analyze the possible error sources in the InSAR and correct them if possible. We present different time series analysis results including azimuth frequency modulation rate error, line of sight (LOS) ionospheric phase, azimuth shift caused by the ionosphere, and LOS displacement processed using both full-aperture and burst-by-burst workflows. The final InSAR LOS displacement time series result reveals both large-scale tectonic and small-scale anthropogenic deformation components. The results demonstrate the potential for measuring continental or even global-scale tectonic deformation and illustrate the promise of upcoming L-band wide-swath SAR missions, such as the NASA-ISRO SAR mission.

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Earth Surface & Interior Program (ESI)