Inter-Comparability of Radiometric Performance between Sentinel-1A and Sentinel-1B

Konferenz: EUSAR 2021 - 13th European Conference on Synthetic Aperture Radar
29.03.2021 - 01.04.2021 in online

Tagungsband: EUSAR 2021

Seiten: 4Sprache: EnglischTyp: PDF

Schmidt, Kersten; Schwerdt, Marco (Microwaves and Radar Institute, German Aerospace Center (DLR), Oberpfaffenhofen, Germany)
Miranda, Nuno (ESA-ESRIN, Frascati, Italy)

The study shows that Sentinel-1B is more sensitive for low backscatter due to higher TX power and higher RX pattern gain compared to Sentinel-1A. Therefore targets covering a wide backscatter range are compared. While for point targets and medium backscatter areas (e.g. rainforest) no significant radiometric differences are found, the NEBZ within calm water is lower for Sentinel-1B compared to Sentinel-1A by about 1.4 dB. By evaluating transponder recordings, the SAR transmit power is found to be higher for Sentinel-1B compared to Sentinel-1A by about 0.7 dB. These different radiometric performances are present although both SAR systems are well calibrated.