NOTE: The Level-1B product is an output from Level-1 processing and is an internal product only. It is not available to users and is considered only as an input to Level-2 processing.
The Level-1 calibration chain computes all calibration corrections. One part of these calibration corrections is characterised on the ground and one part is measured in flight.
There are three types of calibrations:
These calibration corrections are applied in the Level-1 measurement chains.
There are two types of Level-1 processing measurement chains: one to process LRM and SAR-C band data and another to process SAR-Ku band data. LRM mode is useful over open-ocean surfaces where topography is homogeneous.
The main processing steps of the LRM and SAR-C Level-1 measurement chains are:
The main processing steps of the SAR-Ku Level-1 measurement chain are: