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(Synthetic Aperture Radar Altimeter) which is based on the legacy CryoSat and Jason missions.

This instrument will provide a 300 meter resolution while being supported by the MWR instrument to measure atmospheric conditions like water vapor concentration in order to meet the high standards of accuracy for Sentinel-3.

SRAL (Synthetic Aperture Radar Altimeter) is the main topographic instrument to provide accurate topography measurements over sea ice, ice sheets, rivers and lakes.It uses dual-frequency Ku and C band and is supported by a microwave radiometer (MWR) for atmospheric correction and a DORIS receiver for orbit positioning. This allows the instrument, which is based on legacy missions such as CryoSat and the Jason missions, to provide a 300 meter resolution and a total range error of 3 cm. The instrument operates its pulse repetition frequency at 1.9KHz (LRM) and 17.8 KHZ (SAR)

Bibliography:

“3 - Mission Summary - Sentinel Online.” Sentinel, ESA, sentinel.esa.int/web/sentinel/missions/sentinel-3/overview/mission-summary.

“3 - Mission Objectives - Sentinel Online.” Sentinel, ESA, sentinel.esa.int/web/sentinel/missions/sentinel-3/mission-objectives.

“Facts and Figures.” Facts and Figures, ESA, www.esa.int/Applications/Observing_the_Earth/Copernicus/Sentinel-3/Facts_and_figures.

“Instruments.” Instruments, ESA, www.esa.int/Applications/Observing_the_Earth/Copernicus/Sentinel-3/Instruments.