Abstract:Target positioning accuracy is an important indicator of the ground optoelectronic detection system,which directly depends on the accuracy of the initial direction calibration of the optoelectronic detection system.In this paper,a method of direction calibration for an optoelectronic detection system based on quaternion coordinate transformation is proposed,which achieves high precision azimuth and pitches initial direction calibration,laying a foundation for the ground optoelectronic detection system to achieve high precision target search,positioning,tracking,and recognition functions basis.Firstly,the mathematical model of initial calibration is established based on the theory of quaternion and coordinate transformation;secondly,an algorithm and scheme for obtaining the relevant calibration parameters from the measured value are given.Thirdly,the information of high precision WGS84 geographic coordinates of of targets is measured to calculate the calibration parameters;finally,the calibration is applied and the errors are analyzed.The experiments show that the tracking error of the optoelectronic detection system is less than 0.05° at 2km,which meets the high precision positioning requirements of general ground optoelectronic detection systems.This method has been practically applied in a number of ground optoelectronic detection systems.