South Korea will complete the development of an advanced radar system to be placed on the country's KF-X indigenous fighter jets by 2026 that will greatly boost its air-combat capabilities.The state-run Agency for Defense Development has begun the process of developing the active electronically scanned array radars for some 120 KF-X fighter jets that South Korea seeks to develop by the mid-2020s, the Defense Acquisition Program Administration said. It said a meeting with related officials and experts was held at the ADD's headquarters in Daejeon, 164 kilometers south of Seoul.
South Korea plans to build the new planes under the 18 trillion-won ($15 billion) Korean Fighter Experimental project in a bid to replace its aging jet fleet of F-4s and F-5s, while the Korean military decided to develop the AESA radar system on its own as the United States refused to transfer core technologies related to the fighter jet and the advanced radar.
The Korea Aerospace Industries KF-X/Indonesian Aerospace IF-X is a South Korean and Indonesian program to develop an advanced multirole fighter for the Republic of Korea Air Force (ROKAF) and Indonesian Air Force (TNI-AU), spearheaded by South Korea with Indonesia as the primary partner. It is South Korea's second fighter development program following the FA-50.
The project was first announced by South Korean President Kim Dae-Jung at the graduation ceremony of the Korea Air Force Academy in March 2001. South Korea and Indonesia agreed to cooperate in the production of KF-X/IF-X warplanes in Seoul on July 15, 2010. The initial operational requirements for the KF-X/IF-X program as stated by the ADD (Agency for Defence Development) were to develop a single-seat, twin-engine jet with stealth capabilities beyond either the Dassault Rafale or Eurofighter Typhoon, but still less than the Lockheed Martin F-35 Lightning II.
The overall focus of the program is producing a 4.5th generation fighter with higher capabilities than a KF-16 class fighter by 2020. Quantities of the resulting fighter are planned at 120 for the ROK Air Force and 80 for the Indonesian Air Force. South Korea plans to procure it from 2023 to 2030.
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. AESAs main use is in radar, and these are known as active phased array radar (APAR).
The AESA is a more advanced, sophisticated, second-generation of the original PESA phased array technology. PESAs can only emit a single beam of radio waves at a single frequency at a time. The AESA can radiate multiple beams of radio waves at multiple frequencies simultaneously. AESA radars can spread their signal emissions across a wider range of frequencies, which makes them more difficult to detect over background noise, allowing ships and aircraft to radiate powerful radar signals while still remaining stealthy. Most of the radar systems used in modern combat aircraft are AESA systems.
Sources / More Info:
http://airrecognition.com/index.php/archive-world-worldwide-news-air-force-aviation-aerospace-air-military-defence-industry/global-defense-security-news/global-news-2016/august/2834-south-korea-plans-to-complete-kf-x-radar-development-by-2026.html
https://en.wikipedia.org/wiki/KAI_KF-X
https://en.wikipedia.org/wiki/Active_electronically_scanned_array
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