Chinese Radar Developments - KLJ series and others
- Thread starter indochina
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this part is unfortunately incorrect :
There is no better solution for narrowing azimuth resolution except make the antenna bigger which what everyone is doing with their low frequency radar. In fact electronic beam steering actually increase the beamwidth thus worsening the azimuth resolution a bit due to phenomenon of aperture foreshortening naturally occur in electronically scanned array radar.
Also regarding beam shaping.. well this is done by changing the "weighting" scheme which will affect the antenna radiation pattern. If one ever see the equation to find beamwidth of an antenna one might be wondering why the equation looks like this :
Theta=K*(Lambda/D)
Where Lambda is operational wavelength of the radar, D is the width of the antenna. Width here is the "width" of the antenna in particular direction. e.g if one wish to calculate vertical beamwidth of the antenna the D would be the height while if calculation of horizontal beamwidth is desired the width is the way to go.
the "K" factor here is the beamshape factor. The default value is usually 1.25 for Taylor -40 dB weighting scheme OR 0.866 for Unweighted. The unweighted one produces the narrowest possible beam BUT with stronger sidelobes. While larger factor produces wider beamwidth but lower sidelobe, since radar angular resolution is the beamwidth itself in degrees, well there has to be tradeoff between desired resolution vs susceptibility. AESA allows flexibility in this respect as it can dynamically change the weighting scheme in both transmit and receive path. But unfortunately it cannot narrow the beamwidth any smaller than unweighted scheme.
Listened back on an interview from Zhuhai 2018. It was with the people representing China's long range radar. Quite bonkers stuff.
fyi, here is a 2021 article about China's anti-stealth radar. You can read up on some system there.
The main star from 2018 was SLC-7
CETC considers it a 4th generation radar. L Band multifunctional 3D surveillance radar. It can be mechanically rotated. When stopped rotating, it can still scan +/- 60 degrees. When it’s rotating, it’s good to scan aerial radar. When it stops rotating, it can track ballistic missile, rockets and long range artillery. Claims to have 400 km range against stealth target and 1000 km range against ballistic missiles. The radar is mobile, can be set up in 20 minutes.
Accurate enough to guide fighter jet and SAM radar, but not accurate enough to guide actual missiles.
They also talked about the famous YLC-8B radar. YLC-8E has since been developed, but I have not heard any claims about it.
YLC-8B (609) is not mobile, but have similar performance to SLC-7. It is used by PLA. It uses UHF band. The main function is anti-stealth. According to rumors, YLC-8B in service have already found stealth aircraft in real life.
They claim YLC-8B can detect stealth aircraft from 600 km out with enough accuracy to guide fighter jet and SAM radar there.
If they can even get half of this range, it would be quite game changing.
fyi, here is a 2021 article about China's anti-stealth radar. You can read up on some system there.
The main star from 2018 was SLC-7
CETC considers it a 4th generation radar. L Band multifunctional 3D surveillance radar. It can be mechanically rotated. When stopped rotating, it can still scan +/- 60 degrees. When it’s rotating, it’s good to scan aerial radar. When it stops rotating, it can track ballistic missile, rockets and long range artillery. Claims to have 400 km range against stealth target and 1000 km range against ballistic missiles. The radar is mobile, can be set up in 20 minutes.
Accurate enough to guide fighter jet and SAM radar, but not accurate enough to guide actual missiles.
They also talked about the famous YLC-8B radar. YLC-8E has since been developed, but I have not heard any claims about it.
YLC-8B (609) is not mobile, but have similar performance to SLC-7. It is used by PLA. It uses UHF band. The main function is anti-stealth. According to rumors, YLC-8B in service have already found stealth aircraft in real life.
They claim YLC-8B can detect stealth aircraft from 600 km out with enough accuracy to guide fighter jet and SAM radar there.
If they can even get half of this range, it would be quite game changing.
An interesting report made by Wu Jianqi, an academician of the Chinese Academy of Engineering and a radar expert, at the Academy.
The photos show the content displayed by the air situation system at that time, and describe in detail how the anti-stealth radar of the Chinese Air Force found the f-22 in the air defense identification zone of South Korea hundreds of kilometers away in 2013, and guided the Air Force aircraft to observe the f-22 closely.He also mentioned that this radar was used to test the j-20. Unfortunately, the academician was tight-lipped about the test results.
The photos show the content displayed by the air situation system at that time, and describe in detail how the anti-stealth radar of the Chinese Air Force found the f-22 in the air defense identification zone of South Korea hundreds of kilometers away in 2013, and guided the Air Force aircraft to observe the f-22 closely.He also mentioned that this radar was used to test the j-20. Unfortunately, the academician was tight-lipped about the test results.
Very old news. Also, off topic for this thread
Oh, because j-20 seems to be mentioned as well. Which thread should it be on?
There is a Chinese radar thread.
Can you help me move there?
Really? In fact I‘m surprised … when was that F-22/J-20 encounter? From all we know it was a F-35 but not with a Raptor. Can anyone explain more?
There was no F-22/J-20 encounter.
Siege was describing the way that the radar was used to track F-22s on that occasion and that they were monitored. Nothing about the F-22s being monitored by J-20s.
The mention of J-20 was in relation to this radar, where it was "tested against" the radar. Again, nothing about the F-22.