The purpose of the SP is to acquire analog data from the receiver, transform it into digital data, process it, detect space objects and describe their trajectory (distance to the object in time, speed of the object in time). A full system schematic is drawn in the figure below where one can see top-level data exchange between the components of the radar.
The FSM for the SP is depicted in the picture below:
More details may be found in the scientific papers: see “radar” publications