为了提高大靶面交汇测量系统的测量准确度，分析了交汇测量原理，推导出脱靶量坐标公式.根据脱靶量公式分析其各项参量，利用几何关系建立像元坐标与偏移角度之间的映射模型.根据映射模型，利用光栅尺设计了一种针对线阵相机的标定方法，该方法不考虑相机参量，将整个光学系统看作一个整体，基于整体参量直接对像元坐标和它所对应的偏移角进行标定.实验结果表明，标定后的交汇测量系统在1.4 m处的平均测量误差为0.4 mm，最大测量误差优于0.6 mm.该方法简单高效，可提高系统标定的速度，且标定误差满足系统交汇测量准确度的要求.

In order to improve the measurement accuracy of the large target intersection measurement system, the miss distance formula of target was derived by analyzing the principle of intersection measurement. According to the parameters of the formula, a mapping model between the pixel coordinate and the offset angle was established by using the geometric relationship. A calibration method for linear camera was designed by using grating scale according to the model. This method takes the whole optical system as a whole and does not need to consider the parameters of the camera, which directly calibrates the mapping relationship between the coordinates and their corresponding offset angles. The experimental results show that the average measurement error of the calibrated intersection measurement system at 1.4 m is 0.4 mm, and the maximum measurement error is better than 0.6 mm. The proposed method is simple but effective, and can improve the speed of the calibration and satisfy the accuracy requirement of the system.