This is an overview of Russian early-warning radars for air surveillance, and related design bureaus.
The Nizhny Novgorod Research Institute of Radio Engineering (Russian acronym: NNIIRT) has since 1948 developed a number of radars.
[1] These were mainly radars in the VHF-band, and many of which featured developments in technology that represented "first offs" in the Soviet Union.
The Dalney Radiosvyazi NII company (Russian acronym: NIIDAR) developed a number of radars from 1949 to 1959 in co-operation with the NII-20 Lianozovo electromechanical plant.
[3] However, unlike the NNIIRT, this design bureau focused on higher frequency radars like the P-20, P-30, P-30M, P-35, P-32D2 and the P-50 (NATO: E/F-bands).