SAOCOM-1 L-band DInSAR Time Series generation through the P-SBAS approach: algorithm extension and products analysis

We present in this work the new advances of the Differential SAR Interferometry (DInSAR) technique referred to as Parallel Small BAseline Subset (P-SBAS) approach, for the generation of displacement time series from the recently available L-band SAR image sequences acquired by the Argentinian SAOCOM-1 constellation. In particular, we first discuss the algorithmic extensions allowing us to retrieve SAOCOM-1 DInSAR products, with a main focus on the exploitation of Stripmap SAR images and multi-look interferograms. Subsequently, the effectiveness of the extended P-SBAS algorithm is assessed through a comparative analysis between the achieved SAOCOM-1 DInSAR results and the corresponding ones relevant to Sentinel-1 and COSMO-SkyMed acquisitions. This analysis is focused on different test areas relevant to the Italian territory, also including the Campi Flegrei caldera, where GNSS measurements are available. In this case, a comparison between these data and the SAOCOM-1 displacement time series, is also presented. This shows that the mean standard deviation value of the differences between the DInSAR and the GNSS time series, the latter projected in the radar line of sight, is of about 1 cm, further confirming the effectiveness of the P-SBAS processing chain extension.