A Regional Assessment of the Sentinel-3 STM L1b & L2 SAR/PLRM Data Products with an enhanced processing baseline

Salvatore Dinardo (HESPACE/EUMETSAT, Italy)

CoAuthors

Remko Scharroo (EUMETSAT, Germany); Luciana Fenoglio (University Bonn, Germany); Christopher Buchhaupt (TU Darmstadt, Germany); Bruno Lucas (HESPACE/EUMETSAT, Portugal); Carolina Nogueira Loddo (EUMETSAT, Germany); Matthias Becker (TU Darmstadt, Germany); Jérôme Benveniste (ESA, Italy)

Event: 2016 SAR Altimetry Workshop

Session: SAR mode performances: SAR CALVAL from Cryosat-2 and Sentinel-3

Presentation type: Type Poster

In the present work, we carry out a regional assessment of the quality of the Sentinel-3 (S-3) STM L2 SAR (Synthetic Aperture Radar) and PLRM (Pseudo-LRM) data products.
The work is structured in two parts.
In the first part, we will process the Sentinel-3 SAR data products from L0 until L2 in SAR and PLRM mode using a different processing baseline as defined in the S-3 STM Payload Ground Segment (PDGS).
The enhanced processing baseline includes a tailoring of the Delay/Doppler Processing and SAR Waveform Retracking: we will introduce new options, both in the L1b and in the L2 SAR chain, as zero-padding (in range and azimuth direction) and Hamming window in coastal zone and a double extension of the radar range window (for L1b chain) and a Delay-Doppler Stack Masking computed using the exact slant range correction (for L2 chain). We expect in this way to identify the positive impact of these changes in the S-3 data product quality.
TU Darmstadt/University Bonn will provide the PLRM L2 data (built from S-3 STM L1a) using a numerical retracker and zero-padding option, the SAR L2 data will be extracted from the ESRIN GPOD Sentinel-3 service.
In the second part of the work, we will proceed to validate the data.
The L2 altimetric geophysical parameters to be validated are the sea surface height above the ellipsoid (SSH), the sea level anomaly (SLA), the significant wave height (SWH) and the wind speed (U10), all estimated at 20 Hz. The selected test area is the North-East Atlantic Ocean and the North Sea ( between -25 and +16 deg longitudes and between 43S and 63N deg latitudes). The products quality will be assessed in open sea and coastal zone. The data will be validated by cross-comparison between SAR and PLRM data, cross-comparison between PLRM/SAR data and ocean wave model (ECMWF) data , wavenumber spectral analysis and validation against in-situ tide gauge and buoys data.
The in-situ calibration and validation (CAL/VAL) in the German Bight is part of the GB_S3CVAL activities proposed by the University Bonn/TU Darmstadt as part of the Sentinel 3 Validation Team (S3VT).

 

Poster show times:

RoomStart DateEnd Date
Grande Halle Mon, Oct 31 2016,18:30 Mon, Oct 31 2016,19:30
Salvatore Dinardo
HESPACE/EUMETSAT
Italy
salvatore.dinardo@eumetsat.int