Automatic homing means that the missile finds and tracks itself until it finally destroys the target. It usually uses some energy radiated and reflected by the target, such as infrared rays, electromagnetic waves, optical radiation, sound waves and other signals, and relies on the equipment installed on the missile to detect and calculate, forming instructions to make the missile fly to the target. There are active, semi-active and passive types, including:

Radar homing guidance, the missile head is equipped with radar, which emits electromagnetic waves to the target and guides the missile to fly according to the target echo.

Infrared homing guidance, using infrared seeker, converts the infrared radiation emitted by the target into regularly changing electric energy, which is shaped and amplified by electronic circuit to form a guidance signal to guide the missile to fly to the target.

TV homing guidance, there is a TV camera, which uses electron beam scanning to convert the light images of the target and background into electrical signals to guide the missile to track the target.

The working principle of millimeter wave homing guidance is the same as that of radar homing guidance, but the difference lies in the wavelength. The radar works in the microwave band with the wavelength of 10~l cm, and millimeter wave refers to the electromagnetic wave band with the wavelength of10 ~1mm. It is unaffected by weather and smog, except for heavy rain, fog, clouds, snow and hail. Millimeter waves can also penetrate, and "all-weather capability is limited."