How does a fighter plane know it’s been locked on by an enemy fighter?
In: Technology
Radar beams out a radio signal and listens for its return from objects to be tracked. A radar in search mode will be scanning back and forth across the entire sky at a relatively low frequency.
When that radar locks on to an aircraft it will start rapidly scanning just that area where the aircraft is, greatly increasing the frequency of the signal. That lets the aircraft which can also detect the scanning know there is increased interest.
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