The sighting device of seeing optical system has two kinds of situations which are the main image and the secondary image,the main image which is the indispensable sign of presenting the target,but the secondary image is not useful to the target.

Aimed at the existing problem of a certain type of aircraft sight, a bomb performance improved equipment is developed for the ballistic trajectory windage on non-standard weather condition.

Considering the problems of the sight on a certain type of airplane, a device has been developed to improve bombing performance,of which the ballistic trajectory correcting circuit to windage on non stan dard weather condition is an important part.

According to their respective functions,the main transmission mechanisms of a gun sight are analysed as being made up of four mechanisms viz.

Because the adaptive compensation technology of dynamic base-point measure is adopted in this paper,all the influences that disturb power supply could be eliminated,the digital drive signal of true airspeed automatically change with power supply,and the accurate simulation of sensor devices are realized for true airspeed of bombing gun-sight.