针对三线阵立体测绘相机CCD成像靶面偏离最佳像面位置, 影响成像质量的问题, 根据光学系统的设计参量, 计算测绘相机的调焦准确度, 分析像方远心光路对测绘相机调焦准确度及调焦对测绘准确度的影响.结果表明, 光学系统的调焦范围为±2 mm；当采用像方远心光路, 在允许离焦的范围内进行调焦时, 产生的投影畸变可忽略不计.调焦后光学系统的成像质量、畸变要求满足高测绘准确度要求.

For the imaging quality problem which induced by the deviations from the CCD imaging target surface to the best image plane position of three linear array stereo mapping camera, the focusing precision was calculated according to the design parameters of the optical system ,and effect of the telecentric system on the mapping accuracy was analyzed. Telecentric system is adopted to meet the requirement of stereoscopic mapping , the focusing range is about ±2 mm, and the distortion can be negligible within focusing range. After focusing, the optical system imaging quality and distortion meet the requirement of high accuracy of mapping.