Everyone knows the lethality of missiles. It will automatically detonate when it is close to the Japanese target to destroy a certain place. How does the missile determine whether it is close to the target? Because the missile is equipped with a radio fuze that functions similarly to the brain, it is used to determine the target's orientation and control the detonation.
When the missile flies towards the target, the radio fuze on the missile will unlock and enter the working state. It emits strong electromagnetic waves through a miniature antenna into the space around the ballistic path. After electromagnetic waves encounter targets such as aircraft, missiles, and warships, the reflected echoes will be received by the fuze receiver. Because the distance and relative speed between the missile and the target change during flight, the frequency of the received echo also changes dramatically, resulting in a Doppler frequency shift. It's like two trains traveling towards each other. As their relative distance shrinks and their relative speed increases, the calls they hear become louder. The missile is quite close to the target. The faster the two move relative to each other, the higher the frequency of the echo received by the fuze will be, and the greater the Doppler frequency shift will be.
The radio fuze on the missile also continuously determines the position between the missile and the target according to various changes in Doppler frequency shift. When the missile enters the effective killing range, the radio fuze will issue a command to detonate the warhead, and dense fragments will begin to fly towards the target, thus forming a very effective killing surface and destroying the target.