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Ø TechDemoSat-1 (TDS-1) launched 8 July 2014
Ø TDS-1 GNSS-R ocean winds
§ NOC Fast Delivery Inversion (NOC FDI) (Unwin et al, 2016)
§ NOC Bistatic Radar Equation (NOC BRE) (Foti et al, 2015)
Ø GPS L1 noise hotspots (Foti et al, 2017)
Ø Radiometric calibration and impact of direct signal power
Ø Ocean wind inversion performance with calibrated observables
§ NOC Calibrated-FDI (NOC CFDI)
§ NOC Calibrated-BRE (NOC CBRE)
This talk
The story so far…
Global TDS-1 GNSS-R winds with NOC FDI
Data shown only between 55S-55N to avoid sea ice
TDS-1 FDI Wind Bias v ASCAT
Data shown only between 55S-55N to avoid sea ice
(without calibration)
Ø Larger biases found in some parts of the Equatorial ocean
TDS-1 Radiometric Calibration
Ø In-flight radiometric calibration strategy designed by SSTL and
implemented at NOC
Ø TDS-1 data: applicable to Programmed Gain Mode (PGM) only
Ø Tested two calibration approaches:
§ Internal reference (black-body load)
§ External calibration target (Antarctica, Dome-C)
Ø Very good agreement found between the two methods
Ø Inversion strategy similar to FDI
Ø CFDI observable based on calibrated received power
Ø Equatorial biases well mitigated by calibrated approach
TDS-1 Calibrated FDI Wind Bias v ASCAT
Data shown only between 55S-55N to avoid sea ice
(with calibration)
NOC CBRE
Ocean Wind Retrieval Performance