KLJ-7A AESA radar similarities with AN/APG-81 (F-35 AESA radar)

[The SC]

AN/APG-81

Description: The AN/APG-81 is an advanced fire control radar developed by Northrop-Grumman for the F-35 Joint Strike Fighter (JSF). It features both air and surface modes and Active Electronically Scanned Array (AESA) antenna for enhanced performance. The APG-81 radar underwent rooftop integration range-testing phase entering flight testing on a Northrop-Grumman BAC 1-11 testbed aircraft in early 2005. The BAC 1-11 tested its air and surface modes. Northrop-Grumman handed over the first AN/APG-81 active electronically scanned array (AESA) fire control radar to F-35 Joint Strike Fighter (JSF) prime contractor Lockheed-Martin on March 3, 2005. APG-81 radar system will support air-to-air, air-to-surface and electronic warfare modes providing the pilot with all-weather precision targeting and advanced air-to-ground automatic target cueing.
The AN/APG-81 radar is a combination of the proven technologies from the F/A-22's APG-77 and the F-16E/F's APG-80 AESA radar systems. The APG-81 features features 1,000 transceivers with the ability to track aerial targets and moving targets on the ground. In the air surveillance mode can detect an airborne target of one square meter Radar Cross Section (RCS) at a range of 150 kilometers. Besides, can track 23 targets in 9 seconds while engaging 19 of them in 2.4 seconds.
http://www.deagel.com/Aircraft-Warners-and-Sensors/ANAPG-81_a001381001.aspx
http://www.deagel.com/Aircraft-Warners-and-Sensors/ANAPG-81_a001381001.aspx
the last sentence should be corrected to: engaging 9 targets, since the F-35 does not carry 19 missiles, maybe 9..
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KLJ-7A airborne AESA radar

KLJ-7A
During the 2016 Zhuhai Airshow, a new model called KLJ-7A was unveiled to the public. The KLJ-7A is an AESA radar with an reported range of 170km for a 3 m2 target, with the ability to track 15 targets and engage 4.

Radar modes
Data from: Janes Defence[1]

• Range While Search (RWS)
• Velocity Search (VS)
• Single Target Track (STT)
• Track While Scan (TWS)
• Dual Target Track (DTT)
• Situational Awareness Mode (SAM)
• Air Combat Mode (ACM)(with five sub-modes)
• Real Beam Map (RBM)
• Doppler Beam Sharpening (DBS)
• Ground Moving Target Indication/Ground Moving Target Track (GMTI/GMTT)
• Air to Ground Ranging (AGR)
• Synthetic Aperture Radar (SAR)
• Sea Single Target Track (SSTT)
• Beacon (BCN)
  
  

Specifications
Data from: Jane's Defence [1]

• Frequency: X band
• Range:
  • Look-up: >75 km (for RCS of 3 m2) (V1)[1] or
    130 km for RCS of 5 m2 (V1), or
    110 km (for RCS of 3 m2) (V2), or
    140-150 km for RCS of 5 m2 (V2)
  • Look-down: >35 km (for RCS of 3 m2) (V1)[1]
• Total targets tracked: 10 in TWS (Track-While-Scan) mode (V1)
• Reliability:
  • MTBF (Mean Time Between Failure): 220 hours
  • MTTR (Mean Time To Recovery): 0.5 hours
• Weight: ≤120 kg
• Volume: 0.065 m3

https://en.wikipedia.org/wiki/KLJ-7

 

[abdulbarijan]

AN/APG-81

Description: The AN/APG-81 is an advanced fire control radar developed by Northrop-Grumman for the F-35 Joint Strike Fighter (JSF). It features both air and surface modes and Active Electronically Scanned Array (AESA) antenna for enhanced performance. The APG-81 radar underwent rooftop integration range-testing phase entering flight testing on a Northrop-Grumman BAC 1-11 testbed aircraft in early 2005. The BAC 1-11 tested its air and surface modes. Northrop-Grumman handed over the first AN/APG-81 active electronically scanned array (AESA) fire control radar to F-35 Joint Strike Fighter (JSF) prime contractor Lockheed-Martin on March 3, 2005. APG-81 radar system will support air-to-air, air-to-surface and electronic warfare modes providing the pilot with all-weather precision targeting and advanced air-to-ground automatic target cueing.
The AN/APG-81 radar is a combination of the proven technologies from the F/A-22's APG-77 and the F-16E/F's APG-80 AESA radar systems. The APG-81 features features 1,000 transceivers with the ability to track aerial targets and moving targets on the ground. In the air surveillance mode can detect an airborne target of one square meter Radar Cross Section (RCS) at a range of 150 kilometers. Besides, can track 23 targets in 9 seconds while engaging 19 of them in 2.4 seconds.
http://www.deagel.com/Aircraft-Warners-and-Sensors/ANAPG-81_a001381001.aspx
the last sentence should be corrected to: engaging 9 targets, since the F-35 does not carry 19 missiles, maybe 9..
--------------------------------------------------------------------------------------------------------------------------------------------
KLJ-7A airborne AESA radar

KLJ-7A
During the 2016 Zhuhai Airshow, a new model called KLJ-7A was unveiled to the public. The KLJ-7A is an AESA radar with an reported range of 170km for a 3 m2 target, with the ability to track 15 targets and engage 4.

Radar modes
Data from: Janes Defence[1]

• Range While Search (RWS)
• Velocity Search (VS)
• Single Target Track (STT)
• Track While Scan (TWS)
• Dual Target Track (DTT)
• Situational Awareness Mode (SAM)
• Air Combat Mode (ACM)(with five sub-modes)
• Real Beam Map (RBM)
• Doppler Beam Sharpening (DBS)
• Ground Moving Target Indication/Ground Moving Target Track (GMTI/GMTT)
• Air to Ground Ranging (AGR)
• Synthetic Aperture Radar (SAR)
• Sea Single Target Track (SSTT)
• Beacon (BCN)

Specifications
Data from: Jane's Defence [1]

• Frequency: X band
• Range:
  • Look-up: >75 km (for RCS of 3 m2) (V1)[1] or
    130 km for RCS of 5 m2 (V1), or
    110 km (for RCS of 3 m2) (V2), or
    140-150 km for RCS of 5 m2 (V2)
  • Look-down: >35 km (for RCS of 3 m2) (V1)[1]
• Total targets tracked: 10 in TWS (Track-While-Scan) mode (V1)
• Reliability:
  • MTBF (Mean Time Between Failure): 220 hours
  • MTTR (Mean Time To Recovery): 0.5 hours
• Weight: ≤120 kg
• Volume: 0.065 m3

https://en.wikipedia.org/wiki/KLJ-7

Radar specs of radars onboard JFT

KLJ-7 V-I ( Basic KLJ-7 onboard blk 1 JFT's / most likely will be upgraded to V-2 in earlier blocks/ better then upgraded APG-66's onboard F-16A/B block 15's )
Range : 75 Km for 3m2 RCS (earlier report by Janes)
105 Km for 5m2 RCS (Posted by Niret)

KLJ-7 V-2 (Upgraded KLJ-7 onboard blk-II JFT's and most likely onboard JF-17B's/ comparable with the likes of APG-68 V(9) onboard F-16 Blk-52 )
Range : 120-130 Km for 5m2 ( Kanwa interview with project director of the JFT )


In consideration for Block III

KLJ-7A (AESA radar/ compared with Israeli ELM 2052 AESA developed to upgrade the likes of F-15's )
Range : 170 Km for 5m2 (Wang Hongzhe via Henry Kenhmann)

Vixen 1000E ( Undeclared range / the official brouchure states "Significantly enhanced performance relative to similar sized systems with the same weight, volume and power ---- Comparable performance to larger mechanically scanned radrs)

Radars that were under consideration however never made/ will make the platform

RC-400 (Was a very strong consideration in the french upgrade package which was later cancelled)
range : 20% less then RDY radar at 110 Km (so an estimated 80-90 Km range for 5m2 targets)

Grifo-S (Was a primary contender to be the first radar on JFT as we already had radars from Selex equipping the PG's and Roses)
range: 50 nautical miles ( around 90-95 Km)

 

[aliyusuf]

I have my doubts about the 170km stated range for the KLJ-7A AESA radar is for 5m² RCS targets. As stated by the OP the range for the APG-81 is 150km for 1m² targets i.e. 224km for 5m² targets. At the Zhuhai Air Show 2016, the NRIET presenters claimed that KLJ-7A has a performance close to that of the APG-81 of the F-35. But 170km hardly seems close to 224km. In my humble opinion, it is possible that the figure 170km is for a 3m² target i.e. 193km for a 5m² target ... which is much closer. This 5m² RCS for the 170km range is sourced from Henry Kenhmann of the East Pendulum (http://www.eastpendulum.com/airshow-china-2016-radar-aesa-klj-7a) site and everybody else, in my opinion, started picking the figure from there.

Just my humble opinion.

 

[Hassan Guy]

Will the KLJ-7A be built in Karma as well like the KLJ-7?

 

[SQ8]

Not even close. The APG-81 has a much greater target tracking range, capacity, sophistication and engagement capability than the KLJ-7A is even close to.

 

[Basel]

Not even close. The APG-81 has a much greater target tracking range, capacity, sophistication and engagement capability than the KLJ-7A is even close to.

please close this thread and merge similar threads too.

 

[AZADPAKISTAN2009]

Very modular design you can literally replace a sub component and very easy to change I can see why technical units will love this piece in planes, every thing is so accessible and simple to pull out and change

 

[Bilal Khan (Quwa)]

Not even close. The APG-81 has a much greater target tracking range, capacity, sophistication and engagement capability than the KLJ-7A is even close to.

It's puzzling NRIET didn't talk about sensor fusion possibilities. Would love to see an actual package that binds the TRMs on the KLJ-7A to the EW/ECM's TRMs. I imagine this is something China is working on for the J-20.

 

[JamD]

Very modular design you can literally replace a sub component and very easy to change I can see why technical units will love this piece in planes, every thing is so accessible and simple to pull out and change

Call me a skeptic but this model (and it is that, a model), looks too clean and compact. It is almost like it is just for show.

Don't get me wrong, I'm not doubting the Chinese having the capability to develop a small AESA radar. Just that we should take this pictures with a pinch of salt. Like the JF-17B models we see that keep changing every time.

 

[AZADPAKISTAN2009]

Chinese innovation and Engineering is really growing leaps and bounds , I think if you study the Mega Water project Chinese did in their country with out doubt a marvel of Engineering

The radar , obviously a complexity of different type , the Chinese have greatly improved in all sectors. I can safely say in next 6-10 years they might even be the trend setters

The main reason for their sucess is that they do not have 1000 bases all over the world wasting money they are focused on their own economy and trade and work

On Topic :
The size looks right about proper size of a fighter jet , with advancement in Chip and board design and nano level tech , the sizes for these gadgets will continiously shrink. The new tech on board the motherboards enable far more computations and more analysis of real time data.

Evolution of each generation of Radar will certainly be becoming more and more smaller in size

Also if a human was standing right next to the machine we could perhaps get better sense of size or aspect a bit more clearly

 

[The SC]

China has been working on GaN technology for a while, we shouldn't be surprised if they make a GaN technology based AESA radar very soon..

Very modular design you can literally replace a sub component and very easy to change I can see why technical units will love this piece in planes, every thing is so accessible and simple to pull out and change

The other nice remark is that it has enough room to implement an integrated IRST..

 

[C130]

Very modular design you can literally replace a sub component and very easy to change I can see why technical units will love this piece in planes, every thing is so accessible and simple to pull out and change

pretty sure most AESA radars are this modular

 

[Fenrir]

Call me a skeptic but this model (and it is that, a model), looks too clean and compact. It is almost like it is just for show.

It looks normal to me, not that I'm any authority in these kinds of things mind you. Here's the SABR for comparison.

When integrated into an airframe it'll take up more space.

 

[Bilal Khan (Quwa)]

Call me a skeptic but this model (and it is that, a model), looks too clean and compact. It is almost like it is just for show.

Don't get me wrong, I'm not doubting the Chinese having the capability to develop a small AESA radar. Just that we should take this pictures with a pinch of salt. Like the JF-17B models we see that keep changing every time.

For what it's worth, NRIET is China's top military radar vendor. If this had been displayed by Beijing A-Star or Poly Group, I would certainly be a little skeptical (as would the Chinese themselves I imagine). That said, Beijing A-Star was the one that had the EL/M-2053 in its catalogue.

 

[The SC]

KLJ-7A AESA fire control radar for JF-17

根据展商透露的数据，在针对雷达反射面积为5平方米的目标时，经过改进后的KLJ-7A雷达在空空模式下的探测距离上要比原型提升了65%，如果拿目前主 流的轻型战斗机雷达，例如以色列的EL/M-2032雷达进行比较，KLJ-7A雷达在探测同类目标的距离上要大70%；而和瑞典PS-05/A雷达比较 时，KLJ-7A的探测距离也要远40%以上；配备相应雷达之间国产轻型外贸战斗机的性能也一下子从使用KLJ-7雷达时期的“伯仲之间”变成“一马当 先”。
For 5 m2 RCS target, the radar detecting range under air-air mode is increased by 65% to the original model (KLJ-7), compare with Israel EL/M-2302, 70% better range, compare with PS-05/A from sweden, 40% better effective range.

实际上，KLJ-7A雷达的这一性能不仅在同类轻型战斗机雷达产品中处于先进水平，甚至面对第三代重型战斗机机载雷达还具备相当的优势。KLJ-7A雷达 的探测距离不仅大大优于早期苏-27系列使用的祖克N001雷达，也要优于印度空军苏-30MKI战机使用的祖克N011M型无源相控阵雷达。如果考虑到 中俄双发在探测距离测量过程中使用的标准不同，而中国的标准相比之下更为严苛，这种在探测距离上的优势在实际使用中往往要比双方在宣传材料上的差距更加明 显。
.... much better than earlier version of ZUKE N001 of SU-27, better than N011M PESA of SU-30MKI of IAF. Considering the different standard of "detecting range" between China and Russia, which Chinese one is more strict or tough, the advantage of the detecting range of KLJ-7A in real case will be more obvious than the brochure data.

美国APG-83雷达，也就是为台湾F-16V改装所设计的低成本AESA雷达，运用了大量F-35的APG-81的技术，、。该雷达的天线尺寸方面也要 超过KLJ-7A，但在性能上两者接近。中美外贸型雷达技术水平上基本相当，可以想见，双方主力战斗机雷达的技术水平也是在同一层级上的
The US APG-83 radar, for Taiwan F-16V, is a kinda shrank version of APG-81 of F35, has bigger array size than KLJ-7A, but their performance are on same level.

考虑到这只是一款供中轻型战斗机使用的轻型雷达，在主要探测指标上能压倒一系列重型战斗机的机载雷达，再结合该机雷达的尺寸、天线孔径和发射功率分析，该 型雷达的技术水平已经接近美国F-22上使用的AN/APG-77有源相控阵雷达，处于世界先进水平，也足见南京十四所在机载有源相控阵雷达上深厚的技术 实力和中国航空工业的飞速发展。
Regarding it's a radar for mid/light fighter, but it's major performance parameters can beat some heavy fighter's radar, and also consider the array size, antena aperture and transmit power, the technology level of this radar is very close to the APG-77 of F-22, which is among the best level in the world....

除了探测距离外，KLJ-7A雷达还有着不错的探测范围。在搜索距离提升的同时，KLJ-7A雷达还进一步提升了多目标跟踪能力，将同时跟踪目标的数量从 10个增加到15个，并且同时引导导弹攻击其中的4个。并有进一步提升性能的可能。当然对于应用于中轻型战斗机的雷达而言，由于载机一次性携带的中距空空 导弹最多也就在4枚上下，目前的性能也就基本够用了。
........ the radar also improved the multi-target tracing ability, increased simultaneous-tracking-number from 10 to 15, and can attack 4 of them at the same time, and this performance can be upgrated when it's needed........

据展方介绍，KLJ-7A雷达工作模式丰富，包括一般的搜索、跟踪空中、地面和海上不同性质的目标、引导导弹攻击、合成孔径雷达、近距离格斗等。
the radar has abundant work mode ---- scan/trace air/ground/sea target, guide missile to attack, synthetic aperture radar for map drawing, dog fight....etc. etc....

而有源相控阵技术更是让KLJ-7A雷达具备了诸多前辈没有的优点：该型雷达不仅很难用传统的措施实施干扰，反而可以利用其发射天线的技术特点实施电子干 扰作战；同时，由于雷达信号的发射和接收是由大量独立的发射/接收单元组成，无形中提高了雷达的工作可靠性，因为少数几个发射/接收单元的故障并不会影响 雷达的正常使用，一般来说，即使30%的发射/接收单元失效时，雷达系统仍然可以维持基本使用。同时相控阵雷达的多单元结构还可以使其在同一时间内完成多 种功能，使得战机在进行对空搜索、跟踪的同时，可以完成比如气象探测、地图绘制等功能，或者利用雷达的模式交替功能，在短时间内先后执行多种不同的内容。
.The active phased array technology is to KLJ-7A radar has many advantages of the predecessors are not: the type of radar is not only difficult to implement interference with traditional measures, but can use the technical characteristics of its launch antenna electronic jamming operations; , Because the radar signal transmission and reception is composed of a large number of independent transmit / receive unit, virtually improve the operational reliability of the radar, because a few of the transmitter / receiver unit failure does not affect the normal use of radar, Said that even if 30% of the transmitter / receiver unit fails, the radar system can still maintain the basic use. At the same time, the multi-unit structure of the phased array radar can make it perform many functions at the same time, so that the fighter can perform the functions of weather detection and mapping, or use the radar mode Alternating function, and executes a plurality of different contents successively in a short time.

http://errymath.blogspot.com/2016/11/klj-7a-aesa-fire-control-radar-for-jf-17.html#.WDtoQbnXtBo