Rafale: Active Radar Cancellation

Supposedly Rafale uses active radar cancellation technique to keep it self hidden from the enemy radar. The techniques works by adding out-of-phase pulses to pulses emanating from enemy radar. Technically it is very challenging task, it requires that phase of impinging pulses be estimated very precisley (other wise constructive interference may result, making plane more visible than other wise it is). Precise Phase estimation would be very difficult due to
a) No information regarding the arriving pulses is available
b) Channel is wireless adding further probelms
c) Because of the high velocity of the aircrafts doppler spread may be very high.

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