针对范围在十几米至几十米、法向矢量变化大的复杂曲面测量问题，提出一种无干扰精密测量方法。通过光学投射的方法设置测量点和全局控制点，利用定向相机结合固定于测量相机上的定向靶标，解决测量相机初始位置姿态估计问题，进而利用光束平差优化方法解算被测点精确的空间三维坐标。克服了现有方法中必须在被测表面设置编码特征的局限，快速、有效且不会干扰被测曲面。实验表明：原理方法可靠，测量数据总体均方根误差为0.07 mm，能够高精度、高效率地解决大型空间复杂曲面的无干扰精密测量问题。

A non-intrusive precise measuring method for complex surface in size of tens of meters whose normal vector varies greatly is presented. Global control points and measured points are set by means of optical projection. Orientation camera and orientation target fixed on measuring camera are used to solve estimation problem of measuring camera′s initial position and posture. Then the three-dimensional coordinates of measured points are retrieved based on ray bundle adjustment technique. It overcomes the limitation of existing methods that coding targets must be set on measured surface, so it can accomplish non-intrusive measurement. Experimental results show that the total root mean square (RMS) error is 0.07 mm, therefore, the principle of method is reasonable and can solve problems with high accuracy and efficiency.