The equation used to compute sea surface height anomaly at 1Hz is:

SSHA (1 Hz) = altitude of satellite (alt_[x1]_[x2]) - Ku band corrected ocean altimeter range (range_ocean_[x1]_Ku) - altimeter ionospheric correction on Ku band (iono_cor_alt_[x1]_Ku) - model dry tropospheric correction (mod_dry_tropo_cor_zeor_altitude_[x1]) - radiometer wet tropospheric correction (rad_wet_tropo_cor_[x1](_Ku)) - sea state bias correction in Ku band (sea_state_bias_[x1]_Ku) - solid earth tide height (solid_earth_tide_[x1]) - geocentric ocean tide height solution 1 = GOT (ocean_tide_sol1_[x1]) - geocentric pole tide height (pole_tide_[x1]) - inverted barometer height correction (inv_bar_cor_[x1]) - high frequency fluctuations of the sea surface topography (hf_fluct_cor_[x1] for NTC/STC off line products only) - mean sea surface (mean_sea_surf_sol1[x1]_Ku).

The equation used to compute sea surface height anomaly at 20 Hz is:

SSHA (20 Hz) = altitude of satellite (alt_[x1]_[x2]) - Ku band corrected ocean altimeter range (range_ocean_[x1]_Ku) - altimeter ionospheric correction on Ku band (iono_cor_alt_[x1]_Ku) - model dry tropospheric correction (mod_dry_tropo_cor_zero_altitude_01) - radiometer wet tropospheric correction (rad_wet_tropo_cor_01_ku) - sea state bias correction in Ku band (sea_state_bias_01_ku) - solid earth tide height (solid_earth_tide_01) - geocentric ocean tide height solution 1 = GOT (ocean_tide_sol1_01) - geocentric pole tide height (pole_tide_01) - inverted barometer height correction (inv_bar_cor_01) - high frequency fluctuations of the sea surface topography (hf_fluct_cor_01 for NTC/STC off line products only) - mean sea surface (mean_sea_surf_sol1[x1]_ku).

The geophysical corrections are computed at Level-2 processing.