It is very probable, although unconfirmed, that Russia’s air-defence network in Syria is integrated by “air defence grouping’s automated command and control post” Polyana. This Penza Radiozavod made system is made up of two separate units – combat control and command-staff stations – mounted atop two Kamaz trucks. The latest version know as Polyana-D4M1 (main picture) can process up to 500 airborne targets and track up to 255 targets at a time. Polyana is also able to process data from AEW&C and SIGINT aircraft known to fly missions over Syria, such as: A-50U, Tu-214R, Il-20M, and until very recently Ka-31.
Main image: pilot.strizhi.info