The P-40 "Armour" or 1S12 (also referred to by the

NATO reporting name NATO uses a system of code names, called reporting names, to denote military aircraft and other equipment used by post-Soviet states, former Warsaw Pact countries, China, and other countries. The system assists military communications by providi ...

"Long Track" in the west) is a 3-D

UHF Ultra high frequency (UHF) is the ITU designation for radio frequencies in the range between 300 megahertz (MHz) and 3 gigahertz (GHz), also known as the decimetre band as the wavelengths range from one meter to one tenth of a meter ...

radar Radar is a system that uses radio waves to determine the distance ('' ranging''), direction ( azimuth and elevation angles), and radial velocity of objects relative to the site. It is a radiodetermination method used to detect and track ...

developed and operated by the former

Soviet Union The Union of Soviet Socialist Republics. (USSR), commonly known as the Soviet Union, was a List of former transcontinental countries#Since 1700, transcontinental country that spanned much of Eurasia from 1922 until Dissolution of the Soviet ...

Development

The P-40 started development in 1960 and by 1962 the radar had completed state trials and in 1963 was accepted into service by the anti-aircraft troops of the

Soviet armed forces The Armed Forces of the Union of Soviet Socialist Republics, also known as the Armed Forces of the Soviet Union, the Red Army (1918–1946) and the Soviet Army (1946–1991), were the armed forces of the Russian Soviet Federative Socialist Republi ...

. In 1965 the P-40 gained the

GRAU The Main Missile and Artillery Directorate of the Ministry of Defense of the Russian Federation (), commonly referred to by its transliterated acronym GRAU (), is a department of the Russian Ministry of Defense. It is subordinate to the Chief of ...

designation 1S12 as it was adopted as the target acquisition radar of the

2K11 Krug The 2K11 ''Krug'' (; English: 'circle') is a Soviet Union, Soviet and now Russian medium-range, medium-to-high altitude surface-to-air missile (SAM) system. The system was designed by NPO Novator and produced by Kalinin Machine Building Plant. I ...

mobile

anti-aircraft Anti-aircraft warfare (AAW) is the counter to aerial warfare and includes "all measures designed to nullify or reduce the effectiveness of hostile air action".AAP-6 It encompasses surface-based, subsurface ( submarine-launched), and air-ba ...

defence system. The main difference between P-40 and 1S12 is the additional "Telecode system" 1S62, with a telescope antenna at front right of chassis, to share data between 1S12 and 1S32. The P-40 was developed by Scientific Research Institute #208 GKRE, which later became known as

NIIIP JSC Scientific and Research Institute of Measurement Instrumentation – Novosibirsk Plant named after the Komintern (abbreviated as NPO NIIIP-NZiK, ) – Soviet/Russian large scientific and production joint venture (NPO) working in the field ...

of Minradioprom, OKB-588 (later Lianozovskiy Electromechanical Plant, LEMZ) also assisted in the production of the prototype. Between 1966 and 1968 the radar was upgraded, increasing the range of the system. Later, between 1969 and 1970, the radar's range was again improved in addition to achieving better reliability.

Description

The P-40 was the first high-mobility radar to enter into service with the then new tactical anti-aircraft forces of the

. The P-40 used the

AT-T Artilleriyskiy Tyagach Tyazholiy, or AT-T (, meaning "heavy artillery tractor") was a Soviet Cold War-era artillery tractor. The AT-T is based on the chassis and drive system from the T-54 tank. However, the hull has been rotated 180 degrees, wi ...

artillery tractor with tracked chassis, fitted with a 12-cylinder 4-stroke

diesel engine The diesel engine, named after the German engineer Rudolf Diesel, is an internal combustion engine in which Combustion, ignition of diesel fuel is caused by the elevated temperature of the air in the cylinder due to Mechanics, mechanical Compr ...

with an output of 342 kW (465 hp) and producing a top speed of 55 km/h. The P-40 had a crew of 6 and a total weight of 35 tons, the radar being powered by a gas turbine running 400 Hz generator. The radar uses an open frame truncated parabolic antenna with a stacked antenna feed. The radar antenna is mounted on the truck used to transport it giving excellent mobility; the radar is capable of being folded for stowage during transit. Azimuth was determined by mechanical scanning while the angle of the target is determined from within which beam of the antenna stack the target is detected. The radar does not carry a secondary antenna for

IFF In logic and related fields such as mathematics and philosophy, "if and only if" (often shortened as "iff") is paraphrased by the biconditional, a logical connective between statements. The biconditional is true in two cases, where either both ...

Operators

Former operators

Source: * * * * * *

Current operators

Source: * * * * * * * * *

Notes

External links

* https://www.radartutorial.eu/19.kartei/11.ancient/karte052.en.html {{DEFAULTSORT:P-40 Radar Soviet military radars Almaz-Antey products Military vehicles introduced in the 1960s