Chinese Radar Developments - KLJ series and others

taxiya

Brigadier
Registered Member
I knoww im very late to the conversation. But isnt digital beam forming a basic requirement of AESA radars? This capability is advertised publicly by northrop grumman in their apg-77,apg-81,apg-83 radars.
AESA and DBF are different things, similar to internal combustion engine and computer controlled fuel injection. AESA means the beams are steered eletronically. However, to shape a beam towards a specific direction, many TR elements need to emit omnidirectional radia waves each with different phases. Early AESA does this phaseshift by a component phaseshifter on the analog radio wave. Recent DBF AESA eliminated this phaseshifter, its TR elements emit radio waves with the desired phases. The radio waves are generated by DACs reading different lists of binary words each value represents a specific amplitied of the wave. So in short, in ABF, the phaseshift is done in analog domain, in DBF in digital domain.

Here is an article about DBF.

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The blue parts are digital domain. The green is analog domain. The red is phase-shifters which takes in analog waves and output analog waves of same amplitude but different phases. Its work is done by DAC reading waveform tables in DBF.
beamforming-768x397.png


If i may ask where are you guys getting this information that KJ-500 is the only airborne radar in the world with digital beam forming capabilities?
Designer of KJ-500 said so long time ago in an interview. It is a first and will remain so until some other DBF radar is put into service.
 
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taxiya

Brigadier
Registered Member
Yes there is. I was in a watch factory last weak ... very much possible to automate. They maybe doing this to hide their more advanced capabilities.

Well I guess that could be a reason why we are not seeing those radars deployed in large numbers. I see automation coming soon, but some industries are always less automated than others.
These pins that she works with are not the wire and pins you know of in a home computer or TV.

Pay attention to the way she trained herself, using tweezers to pickup sesam seeds without breaking the skins. The pins are 0.4mm in diameter, how soft and delicate do you think a 0.4mm aluminium or copper pin is? Not as fragile as the pins she works with.

There are still lots of things that only human eyes and hands are capable to do, such as surgery. This kind of assembly is very likely as delicate as surgery.
 
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