gambit
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If by 'lock' you mean using the AWACS's signals? Then no.Is it possible? @gambit, Is it possible to have a lock with help of AWACS? Does Pakistan has this capability? if not by when Pakistan can have this capability?
Let me elaborate the question: AWACS has 500KM detection range and 300Km locking range (if any), can a fighter (F22 with locking range 200Km (assumption)) lock from 300Km and fire the missile?
Which country has this technology?
The best we can do AT THIS TIME is to use AWACS signals, or more precisely, signals that came from the AWACS and reflected off the target to provide directional guidance. It means that if the missile is capable enough, it will be able to use those reflected signals to give itself general direction of the target, then when the missile senses that those reflected signals are getting more and more compressed (closer) by virtue of the Doppler effect, it will turn on its own radar, if so equipped, and it will uses its own signals to provide that 'lock'.
In the 'semi-active' mode of operation, the 'radar' signal can come from any source, the parent launch aircraft or an AWACS. A lot of misses, or poor probability of kill (pk), came from this design. Too many factors an affect the source signals that produces those reflected signals, from distance to atmospheric interference to complete loss because the source stopped transmitting.
The 'active' mode of operation, the missile uses its own radar and there are great advantages here. For one, reflected signals have far less angular displacement than if they came from a different direction like in the 'semi-active' design. For another, the Doppler effect is best for proximity fusing because as bodies gets closer to each other, Doppler frequency increases, telling the missile that it is closing in on the target.
Combine the two and you have an example of how an external source like an AWACS can provide general directional guidance until the missile believe, by design, that it can take on the target by itself.
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