As the main weapon of worship end defense

small bore shipborne gun's characteristics of real time

speediness and precision are very important.In allusion to the difficulty of the traditional closed loop fire correction in miss distance quantity measuring

a new method of fire correction against air is presented.This method observes the object's actual movement first

and then calculates a series of ordinal and contrary fire data.Based on these fire data

fire data error sequence can be gained

and consequently fire data error correction can also be forecasted.The method presented called virtual closed loop fire correction

is demon strated to be practicable by digital simulation and the result of experimentation.