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23.01.2023 14:59 Age: 8 days

Swot first (nadir) ocean altimetry data

Category: News of the Swot mission

The sensors of Swot scientific payload have been switched on one by one during the past weeks.

Poseidon-3C nadir altimeter first Ku-band waveforms (Credit Cnes)

Swot nadir along-track sea level anomalies (one track) overlaid on gridded altimetry sea level anomalies for the same day (Credit Cnes for Swot, Copernicus Marine Service for the gridded data)

The sensors of Swot scientific payload have been switched on one by one during the past weeks.

The first altimeter to be switched on is the nadir altimeter, Poseidon-3C, following the precise orbit payload (Doris and GPS sensors). The ground segment has begun processing the nadir altimetry, microwave radiometer and orbit data, providing with the first sea surface heights from Swot. Comparisons with the multi-mission data (including in particular Jason-3, Sentinel-6 Michael Freilich, Saral, etc.) show the very good quality of this classical altimeter and of the processing. 


The innovative KaRIn altimeter-interferometer is the last in the sequence of switch-ons, but the space and ground segments have already proved in line with previous missions' quality.




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