Copernicus Sentinel–1 POD reprocessing campaign

Copernicus Sentinel–1 is a C-Band Synthetic Aperture Radar (SAR) satellite mission within the European Programme. The two satellites Sentinel-1A and -1B were launched in April 2014 2016, respectively. POD (Precise Orbit Determination) Service responsible for determination of orbital auxiliary products required by Payload Data Ground Segment (PDGS). Precise orbits are determined based on dual-frequency GPS (Global Positioning System) data delivered dedicated geodetic-grade receivers on-board satellites. Several updates operational orbit done during years including an update antenna reference point coordinates. switch to carrier phase ambiguity-fixing was major improvement. A reprocessing entire span both became necessary provide consistent time series state-of-the-art models processing settings. Due lack independent observation techniques, Sentinel-1 quality has been assessed analysing metrics, overlaps comparisons. For this purpose, members Quality Working Group (QWG) provided reprocessed their software packages weighted average all five solutions - combined serves as reliability depends among others number available whether manoeuvre performed processed day or not. mean consistency between below 1 cm 3D RMS interval Only few days show inferior due gaps manoeuvres. Following sophisticated validation process, from have made user community.