# Russian air surveillance radars

This is an overview of Russian early-warning radars for air surveillance, and related design bureaus.

## NNIIRT

The Nizhny Novgorod Research Institute of Radio Engineering (Russian acronym: NNIIRT) has since 1948 developed a number of radars. These were mainly radars in the VHF-band, and many of which featured developments in technology that represented "first offs" in the Soviet Union. Innovations include the first Soviet air surveillance radar with a circular scan: the P-8 Volga (NATO: KNIFE REST A) in 1950, the first 3D radar: the 5N69 Salute (NATO: BIG BACK) in 1975, and in 1982 the first VHF-band 3D-radar: the 55Zh6 Nebo (NATO: TALL RACK). Other innovations were radars with frequency hopping; the P-10 Volga A (NATO: KNIFE REST B) in 1953, radars with transmitter signal coherency and special features like moving target indicator (MTI); the P-12 Yenisei (NATO: SPOON REST) in 1955 as well as the P-70 Lena-M with chirp signal modulation in 1968 or the widely used P-18 Terek (NATO: SPOON REST D) in 1970.

## NIIDAR

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. 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). These radars have better accuracy and faster scan rates, and are thus more suited for ground control of fighter aircraft, which complement the lower frequency radars developed by the NNIIRT design bureau. NNIDAR has in recent years expanded their product range to include innovative radar designs like the Podsolnukh-E over-the-horizon (OTH) surface-wave radar and the 29B6 Konteyner. The latter, while also being an OTH-radar, has separate locations for the transmitter and the receiver making it a bi-static system.

## VNIIRT

All-Russian Scientific Research Institute of Radio Engineering (Russian acronym: VNIIRT)
* 1955; P-15 1RL13 Tropa FLAT FACE A, UHF (B/C-band),
* 1970; ST-68 (19Zh6) TIN SHIELD, E-band, Fun fact: First Soviet radar with digital coherent signal processing,
* 1974; P-19 1RL134 Danube FLAT FACE B, UHF (B/C-band)

## Summary

Chronology of Soviet and Russian air surveillance radars :
| Radar | NATO reporting name | Radio spectrum (NATO) | Developed | Fun fact | Design bureau |
| P-3 | | VHF | 1948 | The first Soviet post-World War II air surveillance radar | NNIIRT |
| P-20 Periscope | TOKEN | E/F-band | 1949 | | NIIDAR |
| P-50 Observatory | | E/F-band | 1949 | Stationary variant of P-20 | NIIDAR |
| P-30 | BIG MESH | E/F-band | 1955 | | NIIDAR |
| P-30M | BIG BAR | E/F-band | 1959 | | NIIDAR |
| P-35 | BAR LOCK | E/F-band | 1958 | | NIIDAR |
| P-8 Volga | KNIFE REST A | VHF | 1950 | The first Soviet radar with circular scan | NNIIRT |
| P-10 Volga A | KNIFE REST B | VHF | 1953 | Frequency hopping | NNIIRT |
| P-12 Yenisei | SPOON REST | VHF | 1955 | Coherent radar with MTI | NNIIRT |
| P-15 Tropa | FLAT FACE A | UHF | 1955 | | VNIIRT |
| P-14 Lena | TALL KING | VHF | 1959 | | NNIIRT |
| P-35M | BAR LOCK | E/F-band | 1961 | Improved antenna layout | NIIDAR |
| P-70 Lena-M | | VHF | 1968 | First Soviet radar with chirp | NNIIRT |
| P-18 Terek | SPOON REST D | VHF | 1970 | | NNIIRT |
| ST-68 | TIN SHIELD | E-band | 1970 | First Soviet radar with digital coherent signal processing | VNIIRT |
| Sword-35 | BAR LOCK | E/F-band | 1971 | faster scanning, improved antenna, polarization filters, pulse duration/frequency modulation | NIIDAR |
| 5N84A Oborona-14 | TALL KING C | VHF | 1974 | | NNIIRT |
| P-19 Danube | FLAT FACE B | UHF | 1974 | | VNIIRT |
| 5N69 Salute | BIG BACK | D-band | 1975 | First Soviet 3D-radar | NNIIRT |
| 44ZH6 | TALL KING B | VHF | 1979 | Stationary version of Oborona-14 | NNIIRT |
| 55ZH6 Nebo | TALL RACK | VHF | 1982 | First Soviet meter-wavelength 3D-radar | NNIIRT |
| 1L13 | | | 1982 | | NNIIRT |
| 52E6 | | VHF | 1982-1996 | | NNIIRT |
| 1L13-3 Nebo-SV | BOX SPRING | VHF | 1985 | | NNIIRT |
| 55Zh6U Nebo-U | TALL RACK | VHF | 1992 | | NNIIRT |
| 1L119 Nebo-SVU | | VHF | 1997-2006 | | NNIIRT |
| 59N6-1 Protivnik-G1 | | D-band | 1997 | Average time between failures 840 hours | NNIIRT |
| 1L122 | | D-band | 1997-2006 | | NNIIRT |
| 1L121-E | | UHF | 2011 | It is able to monitor even on the Move | NNIIRT |
| 52E6MU | | VHF | 1997-2006 | | NNIIRT |
| P-18 modernisation kits | SPOON REST D | VHF | 1997-2006 | | NNIIRT |
| 55ZH6M Nebo-M | | VHF/multi-band | 2011 | | NNIIRT |
| Nebo-T | | VHF | 2022 | Nebo-T radars are a heavy upgrade of Nebo-U radar stations | NNIIRT |
| 59N6M | | | | | NNIIRT |
| Podsolnukh-E | | VHF | 2000 | over-the-horizon surface-wave radar | NIIDAR |
| 29B6 Container radar | | VHF | 2000 | Bi-static radar | NIIDAR |