Abstract: A short-distance optical aiming method is used for Chinese new generation launch vehicle,which the photoelectric theodolite is located on the launch tower close to the vehicle.Because of the launch tower’s sloshing,there is error of the reference azimuth used by the theodolite.According to the method of optical vector,the effect model of the reference azimuth error to the aiming error is established.The results of numerical simulation demonstrate the aiming infrastructure should be satisfied a certain degree of stability.

Key words: Short-distance optical aiming, Reference azimuth；Error analysis；Chinese new generation launch vehicle