Question: Who developed  an advanced active electronically scanned array radar system for the fifth generation aircraft that is the designation intended for a stealth, single-seat, twin-engine jet multirole fighter aircraft designed for air superiority and attack operations ?
Context: Irbis-E (Snow Leopard) is an advanced multi-mode, hybrid passive electronically scanned array radar system developed by Tikhomirov NIIP for the Su-35 multi-purpose fighter aircraft.  NIIP developed the new radar based on the Bars radar system provided to Su-30MKI/MKM/MKA aircraft. N036 Byelka (Russian: Белка , literally Squirrel) is an advanced active electronically scanned array radar system developed by Tikhomirov NIIP for the fifth generation Sukhoi Su-57 fighter aircraft.  NIIP developed the radar from the N035 Irbis-E that was equipped on the Su-35S fighter aircraft. An active electronically scanned array (AESA), is a type of phased array antenna, that is a computer-controlled array antenna in which the beam of radio waves can be electronically steered to point in different directions without moving the antenna.  In the AESA, each antenna element is connected to a small solid-state transmit/receive module (TRM) under the control of a computer, which performs the functions of a transmitter and/or receiver for the antenna.  This contrasts with a passive electronically scanned array (PESA), in which all the antenna elements are connected to a single transmitter and/or receiver through phase shifters under the control of the computer.  AESA's main use is in radar, and these are known as active phased array radar (APAR). EMPAR (European Multifunction Phased Array Radar) is a PESA rotating C band multifunction passive electronically scanned array radar built by Selex ES (previously SELEX Sistemi Integrati, since 2016 merged in Finmeccanica, than Leonardo S.p.A.).  It is designed to be the principal radar system aboard naval vessels of medium and large sizes.  The radar offers full volumetric search coverage, low altitude and surface search, the tracking of multiple targets, and the capability to uplink information for missile guidance. A passive electronically scanned array (PESA), also known as passive phased array, is a phased array antenna, that is an antenna in which the beam of radio waves can be electronically steered to point in different directions, in which all the antenna elements are connected to a single transmitter (such as a magnetron, a klystron or a travelling wave tube) and/or receiver.  This contrasts with an active electronically scanned array (AESA) antenna, which has a separate transmitter and/or receiver unit for each antenna element, all controlled by a computer.  AESA is a more advanced, sophisticated versatile second-generation version of the original PESA phased array technology. The AN/TPS-80 Ground/Air Task Oriented Radar (G/ATOR) is the United States Marine Corps next generation Air Surveillance/Air Defense and Air Traffic Control (ATC) Radar.  The mobile active electronically scanned array radar system is currently being developed by Northrop Grumman and is expected to reach initial operating capability in August 2016. The Sukhoi Su-57 (Russian: Сухой Су-57 ) is the designation intended for a stealth, single-seat, twin-engine jet multirole fighter aircraft designed for air superiority and attack operations.  The aircraft is the product of the PAK FA (Russian: ПАК ФА , Russian: Перспективный авиационный комплекс фронтовой авиации , "Perspektivny Aviatsionny Kompleks Frontovoy Aviatsii", literally "Prospective Airborne Complex of Frontline Aviation"), a fifth-generation fighter programme of the Russian Air Force.  Sukhoi's internal name for the aircraft is T-50.  The Su-57 will be the first aircraft in Russian military service to use stealth technology.  The fighter is planned to have supercruise, stealth, supermaneuverability and advanced avionics to overcome the prior generation fighter aircraft as well as ground and maritime defences. The Euroradar CAPTOR is a next-generation mechanical multi-mode pulse Doppler radar designed for the Eurofighter Typhoon.  Development of the CAPTOR lead to the Airborne Multirole Solid State Active Array Radar (AMSAR) project which eventually produced the CAESAR (CAPTOR Active Electronically Scanned Array Radar), now known as CAPTOR-E. The Elta 2052 is an advanced airborne active electronically scanned array fire control radar for fighter aircraft.  It is suitable for F-15, MiG-29, Mirage 2000 and LCA Tejas.  The "EL/M-2052" is an advanced Airborne Fire Control Radar (FCR) designed for air superiority and advanced strike missions. The IAI EL/M-2075 Phalcon is an airborne early warning and control (AEW&C) active electronically scanned array radar system developed by Israel Aerospace Industries (IAI) and Elta Electronics Industries of Israel.  Its primary objective is to provide intelligence to maintain air superiority and conduct surveillance.  The Federation of American Scientists stated that the Phalcon was the most advanced AEW&C system in their 1999 article.  It was surpassed by newer versions—the EL/W-2085 and the EL/W-2090.
Answer: Tikhomirov NIIP