为了实现离轴反射式航天CCD相机镜头焦距的精密测量,同时降低传统测量方法对大口径长焦距准直管和大型精密旋转平台等昂贵测量装置的依赖,研究了离轴反射式航天CCD相机镜头焦距的测量方法.改进了基于精密测角原理的焦距测量方法,测量装置主要由电子经纬仪和测量显微镜组成;分析比较了该测量方法与传统测量方法的优缺点;建立了该方法求解离轴反射式相机镜头焦距的数学模型和误差分析模型.实际测量结果表明:该方法所使用的测量装置简单易得,节约了测量成本;测量精度达到10-2 mm量级,可以满足非测绘用途的离轴反射式航天CCD相机镜头焦距的测量精度要求. In order to realize the precise measurement of focal length of off-axis reflective space CCD camera lens and reduce the dependence of traditional measurement methods on expensive measuring devices such as large-diameter long focal length collimator and large precision rotating platform, the off-axis reflective space CCD camera lens The focal length measuring method is improved, the focal length measuring method based on the principle of precision goniometry is improved, the measuring device mainly consists of electronic theodolite and measuring microscope, the advantages and disadvantages of this measuring method and the traditional measuring method are analyzed and compared, The mathematical model and the error analysis model of the focal length of the camera lens.The actual measurement results show that the measuring device used in the method is simple and easy to obtain and saves the measurement cost; the measurement accuracy reaches the order of 10-2 mm, Axis Reflective Space CCD Camera Lens Focal Length Measurement Accuracy Requirements.