Independent Verification of the Sentinel-1A System Calibration

Abstract

In the frame of the GMES program, the main objective of the Sentinel-1 mission is to ensure the continuity of SAR data ac- quisitions in C-band for global earth monitoring. Sentinel-1A is the first of two C-band satellites launched in April 2014. In addition to the commissioning of Sentienl-1A executed by ESA, an independent verification of the system calibration has been executed. For this purpose, the complete calibration chain was developed and established by DLR, starting with a calibration concept, a detailed in-orbit calibration plan, the SW-tools for analyzing and evaluating all the measurements up to the calibration targets serving as accurate reference. Based on an efficient calibration strategy, this paper describes the different activities performed by DLR and presents the results obtained during the commissioning phase of Sentinel- 1A.