Design method for locking before launching, resisting launching impact and preventing seeker image unlocking

The invention discloses a design method for locking before launch, resisting launch impact and preventing seeker image unlocking, which comprises the following steps: a projectile adopts a television/infrared image homing guidance mode, after a shooter searches and identifies a target, a view field is switched to a cylindrical projectile seeker with locking and tracking capabilities, and the optical axis of the seeker is adjusted to press the target and lock the target; a target is locked before launching, and the condition that the cannonball seeker receives a firing signal is used as a launching condition, namely firing is forbidden if the cannonball seeker cannot receive the firing signal; after the firing button is pressed down, the cylindrical shell guide head receives a firing signal, and the optical axis is in an electric lock state; after the shell is completely discharged from the cylinder, the electric lock state is released; and after the launching disturbance disappears, the cylindrical shell seek