Identify the enemy (IFF)
In modern operations, the air is full of enemy and enemy aircraft and various advanced weapons launched from the ground and airborne platforms, so reliable enemy or enemy identification is extremely important. For example, in all wars of the 20th century, the act of cannibalism caused by recognition errors became an important issue.
Current enemy identification systems use an interrogation / response method, which uses cryptographic spread spectrum signals. The interrogation signal received by the friendly party is considered to be the "correction" code automatically returned by the interrogator on our platform. This "correction" code must be changed frequently to prevent the enemy from recording and transmitting as our correction code ("repeated interference"). This code change is at the end of the real interval of the code.
The better the accuracy of the clock, the shorter the effective interval of the code may be, and the stronger the anti-interference ability against repeated interference. Therefore, for users who cannot re-synchronize their clocks in the battle clock, the autonomous time is also The longer.
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