Level-1 processing chain produces five types of Level-1 SRAL products available to users:

• L1B ECHO_SAR_Ku: L1 Tracking measurements in SAR mode - Ku band (20-Hz)

• L1B-S ECHO_SAR_Ku: L1 Tracking measurements in SAR mode - Ku band (20-Hz)

• L1A ECHO_SAR_Ku: L1 Tracking measurements in SAR mode - Ku band (20-Hz)

• L1B ECHO_LRM: L1 Tracking measurements in LRM mode (20 Hz – Ku and C bands)

• L1B ECHO_PLRM: L1b Tracking measurements in pseudo-LRM mode - (20 Hz – Ku and C bands)

Each one of these products is generated by a Level-1 processing chain:

• Level-1 SAR_Ku processing chain computes and applies the main corrections for a Doppler-delay processing.

• Level-1 LRM processing chain is a conventional altimetry processing chain and all algorithms involved are similar to the algorithms applied to other conventional altimetry missions such as EnviSat or Jason-2.

• Level-1 PLRM processing chain are very similar to Level-1 LRM processing chain algorithms but applied to L0 SAR input data. In the PLRM chain, a new algorithm is required to convert SAR waveforms to LRM-like waveforms.