Dnestr radar (Russian: Днестр) and Dnepr radar (Russian: Днепр), both known by the NATO reporting name Hen House,[note 1] are the first generation of Soviet space surveillance and early warning radars. Six radars of this type were built on the periphery of the Soviet Union starting in the 1960s to provide ballistic missile warnings for attacks from different directions. They were the primary Soviet early warning radars for much of the later Cold War. In common with other Soviet and Russian early warning radars they are named after rivers, the Dnestr and the Dnepr.[note 2]
The Dnestr/Dnepr radars were intended to be replaced by the newer Daryal radars starting in the 1990s. Only two of the planned Daryal radars became operational, due to issues such as the dissolution of the Soviet Union. As of 2012, the Russian early warning network still consists of some radars of this vintage. It is likely that all the existing radars will be replaced by the third generation Voronezh radars by 2020.
The Dnestr radar came from work on ballistic missile defence undertaken in the late 1950s and early 1960s. System A, the prototype for the A-35 anti-ballistic missile system, was set up in the Sary Shagan testing grounds, in the Kazakh SSR.[7]: 123 Work on the system was led by design bureau KB-1 which proposed using VHF radar RTN (Russian: РТН) and the Dunay-2 UHF radar. Other alternatives were sought from Soviet industry and RTI proposed using VHF radar TsSO-P (Russian: ЦСО-П) and UHF radar TsSS-30 (Russian: ЦСС-30).[8]
TsSO-P (standing for Russian: центральная станция обнаружения – полигонная meaning central detection station – test site) was selected for further development, together with the Dunay-2.[8] TsSO-P had a long horn antenna 250 metres (820 ft) long and 15 metres (49 ft) high. It had an array with an open ribbed structure and used 200 microseconds pulses. Hardware methods were designed for signal processing as the intended M-4 computer could not run. It was built at area 8 in Sary Shagan and was located at 46°00′04.65″N 73°38′52.11″E / 46.0012917°N 73.6478083°E / 46.0012917; 73.6478083. It first detected an object on 17 September 1961.[8]
TsSO-P took part in the 1961 and 1962 Soviet Project K nuclear tests above the Sary Shagan range to examine the effects of high altitude nuclear explosions on missile defence hardware.[8]
TsSO-P was effective at satellite tracking and was chosen as the radar of the Istrebitel Sputnikov (IS) anti-satellite programme. This programme involved the construction of two sites separated in latitude to form a radar field 5,000 kilometres (3,100 mi) long and 3,000 kilometres (1,900 mi) high. The two sites chosen were at the village of Mishelevka near Irkutsk in Siberia, which was called OS-1, and at Cape Gulshad on Lake Balkhash near Sary Shagan, which was called OS-2. Each site received four Dnestr radar systems in a fan arrangement.[8][9][10][11]: 421 [11]: 433 [12]
Un radar Dnestr estaba compuesto por dos alas de radar TsSO-P unidas por un edificio de dos pisos que contenía un sistema informático conjunto y un puesto de mando. Cada ala del radar cubría un sector de 30 grados con un haz de exploración de 0,5 grados. El patrón de escaneo de elevación era una "pala" con un ancho de 20 grados. Los sistemas de radar se dispusieron para crear una barrera en forma de abanico. De los cuatro radares, llamados células (ruso: РЛЯ , romanizado : RLYa aproximadamente célula de localización de radio), dos estaban orientados hacia el oeste y dos hacia el este. Todos escaneados entre +10 grados y +90 grados de elevación. [8]
La construcción en los dos sitios comenzó entre 1962 y 1963 con mejoras en el modelo de prueba TsSO-P que se transmitieron a las unidades desplegadas. Ganaron una computadora M-4 2-M con semiconductores , aunque el resto del radar usaba tubos de vacío . Los sistemas de radar se completaron a finales de 1966 y se utilizó el cuarto Dnestr en Balkhash para las pruebas. [8] En 1968, el satélite objetivo Dnepropetrovsk Sputnik , DS-P1-Yu , se utilizó para probar la capacidad del sistema. [12] [13]
Los radares Dniéster fueron aceptados para el servicio por las Fuerzas de Defensa Aérea Soviéticas en abril de 1967 y pasaron a formar parte de la red de vigilancia espacial SKKP . [8] [11] : 434 [14]
Paralelamente a la implementación de las unidades de vigilancia espacial Dnestr, se estaba desarrollando una versión modificada de las unidades Dnestr originales, el radar Dnestr-M, para que actuara como radar de alerta temprana para identificar ataques con misiles balísticos . Los dos primeros se construyeron en Murmansk, en el norte de Rusia ( Olenegorsk – RO-1) y cerca de Riga, en la entonces RSS de Letonia ( Skrunda – RO-2). Constituyeron el comienzo de la red SPRN soviética , el equivalente de los BMEWS de la OTAN . [11] : 421 [8] [15]
El primer Dnestr-M en Olenegorsk se completó en 1968. [8] En 1970, se aceptaron para el servicio los radares de Olenegorsk y Skrunda, y un centro de mando asociado en Solnechnogorsk . Según Podvig (2002), parece que estaban posicionados para identificar lanzamientos de misiles desde submarinos de la OTAN en los mares de Noruega y del Norte . [5]
The Dnestr-M included many improvements over the previous versions such as an increase in the pulse length from 200μs to 800μs which increased the range of objects identified, more semiconductors, and many other scanning and processing changes.[8]
A version of this radar was built at the Sary Shagan test site and was called TsSO-PM (Russian: ЦСО-ПМ). After this had completed tests in 1965 it was decided to upgrade nodes 1 and 2 of the two OS sites to Dnestr-M, keeping nodes 3 and 4 as Dnestr. These radars remained as space surveillance radars which scanned between +10 and +90 degrees, comparative to scanning between +10 and +30 degrees for the missile warning radars. A space surveillance network of four Dnestrs and four Dnestr-Ms, and two command posts was formally commissioned in 1971.[8]
Work to improve the radar continued. An improved array was designed which covered 60 degrees rather than 30. The first Dnepr radar was built at Balkhash as a new radar, cell 5. It entered service on 12 May 1974.[2] The second was a new early warning station at Sevastopol. New Dneprs were also built at Mishelevka and another at Skrunda, and then one at Mukachevo. The remaining radars were all converted to Dnepr with the exception of cells 3 and 4 at Balkhash and Mishelevka which remained space surveillance radars.[5][8][11]: 422
All current operational radars are described as Dnepr, and have been updated incrementally.[2][16]
Each Dnepr array is a double sectoral horn antenna 250m long by 12 m wide.[2] It has two rows of slot radiators within two waveguides. At each end of the two arrays, there is a set of transmitting and receiving equipment. It emits a signal covering a sector 30 degrees in azimuth and 30 degrees in elevation, with the scanning controlled by frequency. Four sets mean the radar covers 120 degrees in azimuth and 30 degrees in elevation (5 to 35 degrees).[2]
The Dnepr involved the horn antenna being reduced from 20 to 14 metres in height and the addition of a polarising filter.[8]
These radars have been installed at six different radar stations and as of 2012 are operational at three – Balkhash, Mishelevka and Olenegorsk.[2][16][17] The 1972 Anti-Ballistic Missile Treaty required that early warning radars were located on the periphery of national territory and faced outwards. This caused problems when the Soviet Union collapsed in 1991 as many of the radar stations were now in newly independent states.[5][15][18][19] The first station to close was Skrunda, in newly independent Latvia. A 1994 agreement between Russia and Latvia agreed that the two Dnepr radars there would stop working in 1998, and would be fully demolished by 2000.[20]: 129 [21]: 65 [11]: 426
Russia signed an agreement with Ukraine in 1992 allowing it to continue using the Dnepr radars at Sevastopol and Mukachevo. The stations were run by Ukrainian personnel and data was sent to the headquarters of the Russian early warning system in Solnechnogorsk.[22][23] In 2008 Russia announced that it was pulling out of the agreement with Ukraine and that the last data given to Russia from the stations would be in 2009.[24]: 76 [25] The Ukrainian government announced that the stations were to be used part-time for space surveillance.[26][27]
The remaining stations in Russia and abroad are being replaced by the Voronezh radar. The Dneprs in Mishelevka, Irkutsk will close once the second array of the new Voronezh radar is operational.[citation needed] The Dnepr at Olenegorsk, Murmansk will be replaced by a Voronezh as well. It is planned to start construction there in 2017.[17][28]
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