为了提高三轴光电跟踪系统的指向精度, 针对三轴光电跟踪系统的光机结构提出了一种具有明确物理意义的指向误差修正模型。首先, 根据四元数的旋转变化方法详细分析了各轴系误差对空间目标指向误差的映射关系表达式, 然后, 通过这些关系式建立三轴光电跟踪系统的指向误差修正模型。实验结果表明, 该方法可以将有效的修正系统指向误差, 且外符合修正精度高于球谐函数指向误差修正模型, 同时该方法在装配调试阶段对预估指向精度具有一定的参考指导作用。

In order to modify the pointing error of three-axis optoelectronic tracking systems, a new method based on the optical-mechanical structure of three-axis systems was proposed. Firstly, related equations which show the impaction of axis errors to the pointing error of spatial target were analyzed based on the rotation transform theory of quaternion. Then, a new modification model of three-axis optoelectronic tracking system was obtained thought all the different equations. Experimental results show that the method can reduce the pointing error effectively, and the exterior-error modified capability of this method is higher than spherical-function modification model. At the same time, the method would have a certain reference guide to estimate the pointing precision during assemblage and debugging.