It has a phase modulated monopulse radar, with 3 antenna groups.
(FA-110, FA-130, FA-140)


While the analogue, single target tracking monopulse sets are precisely keeping the target in the center of the pencil beam, the digitally aimed pencil beam is following in steps rather than continuously tracking.
Here the monopulse method is used to decide, where the target is located from the center of the beam.