Estimation of phase noise by time series analysis of ALOS-2 PALSAR-2 data

PALSAR-2 on ALOS-2 developed by JAXA, is a follow-on L-band SAR sensor from PALSAR on ALOS. The mission objectives defined by JAXA include contribution to disaster monitoring. To establish the methodology to acquire the damaged area for disaster monitoring, we need to improve our understanding of the relationships between the sensor parameters (e.g., coherence and errors of the interferogram) and specification. This study conducted InSAR analysis using several pairs of PALSAR-2 data of the Tsukuba study site, and quantitatively analyzed the coherence and errors of the DEM of flat targets. In addition, we developed a method to evaluate the phase noise and revealed that the phase noise of PALSAR-2 was about 2% (half) that of the noise of PALSAR.