Although the launch azimuth can be efficiently calibrated by gyrotheodolite,the deviation in reference azimuth could be caused due to gyrotheodolite's system error.In order to launch missile accurately and quickly,the reference launch azimuth in missile's launch position must be accurately calibrated.Based on the verification of various system errors,the first term in system errors of photoelectric integral gyrotheodolite is analyzed,and the azimuth error models for the orientation errors of launch position...