NOTE: The Level-0 product is an output from Level-0 processing and is an internal product only. It is not available to users and is considered only as an input to Level-1 processing.

The satellite sends all data measured to the Ground Stations in the form of Instrument Source Packets (ISPs). The data in ISPs are categorised and packaged according to their type:

• TM_ACQ: telemetry packets generated during acquisition mode
• TM_CAL1: telemetry packets generated during CAL1 calibration mode
• TM_CAL2: telemetry packets generated during CAL2 calibration mode
• TM_ECHO_LRM: telemetry packets generated during LRM tracking mode
• TM_ECHO_SAR: telemetry packets generated during SAR tracking mode.