Abstract: A method of how to uniformly distribute the accuracy on the azimuth direction of the optic- electronic system and mast platform system is put forward. This method is used to distribute and analyze the accuracy of the mast-mounted photodetection system. The overall accuracy index is separately distrib- uted to photodetection system and mast platform system. This accuracy distribution is calculated based on the system parameters to prove whether it could satisfy the accuracy requirement. The rationality of accu- racy distribution approach of the mast-mounted photodetection system is validated through infield experi- ment. The calculated and experiment error values of azimuth direction of the photodetection system are 1. 2义and 1. 9义, respectively, which are less than 2义. The calculated and experiment error values of azi- muth direction of the mast platform system are 19. 7义and 23. 5义, which are less than 24义. The overall cal- culated and experiment error values of the system are less than 25义.

Key words: mechanical design, photodetection, optic-electronic mast, accuracy analyses, error distri- bution