Monday, 19 November 2018

KLJ-7A active electronically scanned-array radar is being considered for use with J-20

KLJ-7A AESA radar being considered for China’s J-20 fighter aircraft

Reuben F Johnson, Kiev - IHS Jane's Defence Weekly

16 November 2018
The Nanjing Research Institute of Electronics Technology’s (NRIET’s) KLJ-7A active electronically scanned-array (AESA) radar is being considered for use with China’s J-20 multirole ‘fifth-generation’ fighter aircraft, a Chinese industry source has told Jane’s .

The radar, a mock-up of which was displayed by NRIET in a three-array configuration at the Airshow China 2018 on 6–11 November, is one of the options being evaluated for use on the platform, said the source, without providing further details.

The KLJ-7A is an advanced variant of the KLJ-7 (also referred to as Type 1478) X-band airborne fire-control radar (FCR) that has previously been presented in a number of different configurations.


KLJ-7A active electronically scanned-array (AESA) radar

The KLJ-7A multi-mode X-band jamming-resistant Active Electronically Scan Array (AESA) radar developed by the Nanjing Research Institute of Electronics Technology (NRIET) based in Jiangsu Sheng provice, China.

The KLJ-7A is the proposed AESA radar to be installed on the JF-17 Thunder Block III single engine fighter jet, which is operated by the Pakistan air force, says NRIET’s head Hu Mingchun in a China Daily report. A mockup of the KLJ-7A was displayed by NRIET at the Zhuhai air show 2016. Nanjing Research Institute of Electronics Technology (NRIET) is also the designer and manufacturer of the radars of J-10, J-11B, J-15 and J-20 stealth fighter.

Russian radar manufacturer Phazotron and NIIP had worked closely in the past with the Chinese radar design bureaus and provided technical assistance as well as operational models of Russian-made radar sets that were used as benchmarks in the process of these Chinese firms developing their own design.

The KLJ-7A AESA radars provide key defensibility gains against electronic warfare (EW) jamming and enemy radar detection. The AESA radars utilize many arrays — i.e. transmit and receive modules (TRM) — that can each transmit in a different frequency. In unison, these TRMs enable a single AESA radar unit to transmit in different frequencies simultaneously.

The KLJ-7A radar eliminates the former antenna and transmitter, preserves the latter’s control system and display system, and upgrades the processor. The radar is analogous to Raytheon AN/APG-63(V2) AESA radar. KLJ-7A incorporates the versatility, simplify logistics and reduce costs.

The radar combined three modules on the back of the radar — the power supply, the computer and the cooling cell.The antenna and the computer module are liquid cooled, as is marked on the housing. The cooling systems reportedly perform better than the cooling systems of Russian-made Zhuk-AE radar. Source:

The radar operates in the X band and weighs 145kg. It can detect a fighter-sized target at 170km. It can track 15 targets simultaneously and engage four at the same time. It also has a surface search function. AVIC claims that it has a “strong anti-jamming capability.” Source:

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Chengdu J-20: Details

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