Cinzia Zuffada (Jet Propulsion Laboratory, USA); Maria-Paola Clarizia (University of Michigan, USA); Estel Cardellah (Institut de Ciències de l\'Espai, Spain)

This study presents an analysis and comparison of the performance of different algorithms to estimate sea surface height from Global Navigation Satellite System Reflectometry (GNSS-R) data. It provides results from inter comparision of different GNSS-R simulators to generate synthetic realistic GNSS-R waveforms. These simulators are JPL's GNSS-R simulator which generates waveforms using semicodeless approach, CYclone Global Navigation Satellite System (CYGNSS) End-to-End Simulator (E2ES) which uses Global Positioning System (GPS) Coarse Aquisition (C/A) code to generate waveforms, and Spanish simulator which generated waveforms using interferometric approach. HALF algorithm is implemented and applied to synthetic data, and the achieved precision in the SSH for the different algorithms is assessed and compared. An analysis of data from TechDemoSat-1 (TDS-1) will also be conducted to retrieve sea surface height.