FN Archimer Export Format PT C TI Altimeter as an Imager of the Sea Surface Roughness: Comparison of SAR and LRM Modes BT AF TOURNADRE, Jean CHAPRON, Bertrand AS 1:1;2:1; FF 1:PDG-ODE-LOPS-SIAM;2:PDG-ODE-LOPS-SIAM; C1 Univ Bretagne Occidentale, CNRS, IFREMER, Lab Oceanog Phys & Spatiale,IRD, F-29280 Plouzane, France. C2 IFREMER, FRANCE SI BREST SE PDG-ODE-LOPS-SIAM UM LOPS IN WOS Ifremer UMR UR https://archimer.ifremer.fr/doc/00719/83076/88058.pdf LA English DT Proceedings paper DE ;Altimeter;high resolution surface roughness;inversion AB Satellite altimeters, designed to measure the topography of the ocean, are also good imagers of the ocean surface backscatter. A method was developed to invert the classical Low Resolution Mode high resolution HR waveforms in terms of surface backscatter at high resolution (similar to 300m). Since the launch of Cryosat-2 in 2010, a new generation of altimeters using Doppler capabilities has emerged and has become the standard for the new altimeters such as the Sentinel-3 one. The so-called SAR altimetry provides higher along-track resolution and lower noise level. In this mode altimeter are also good imagers of the surface backscatter. A new method of inversion of SAR waveforms is presented. The processing of the Sentinel-3 altimeters provides collocated SAR and LRM waveforms that are used to intercompare the inverted surfce backscatter. PY 2020 DI 10.1109/IGARSS39084.2020.9323226 ID 83076 ER EF