Polyana-D4
9S52 Polyana-D4 ASU () is a Soviet/Russian automated command and control system for air defence troops. May act as an upper level command post (CP) of the SAM brigade including S-300V as well as the 9K37 Buk complex. And also other means, including aircraft. Developed by Scientific Research Institute of the automatisation technics of Minradioprom. Chief designer - G.A.Burlakov. Development works started under the Decisions of the Special Commission of the Presidium of the USSR Soviet Ministry on military-industrial questions dated June 29, 1977 and August 27, 1981. Mass production of the system organized at the Minsk  Electromechanical Plant (currently GNPO Agat), but later transferred to Penza, former Minradioprom factory. In service since 1986. Polyana-D4 is a substantial remake of 9S468M1 Polyana-D1, development by NIIAA. Etymology of the name: "Polyana" is Russian for the "meadow". Structure. PBU (MP06M of Polyana-D4M) is based on a BAZ-6950 chassis. KShM (MP02M of Polyana-D4M) is based on a Ural-375 chassis. Modifications. Algeria 2 (2014) Syria (2018)