The guidance accuracy of precision guided weapons will decrease when the guidance,navigation and control systems are damaged or disturbed by the directed energy weapon.However,the precision guided weapons may still pose a threat to the target.The guidance precision variation of precision guided weapons before and after seeker failure is analyzed by trajectory simulation.Then,the deviation criterion for precision guided weapons is proposed combined with risk-estimate distances of the US army.The criterion can quantitatively evaluate the combat effectiveness of anti-precision guidance weapons operation with directed energy.

The Yugoslavia air defense forces shot down the F-117A stealth aircraft was the world’s first and so far the only successful war case of shooting down stealth craft.The war case is still of great practical value to the study of air defense tactics.The methods of open source intelligence analysis and simulation are used to restore the battle history with data details.The research conclusion is highly reliable and consistent which was supported by corresponding evidence.