针对高精度 CMOS星敏感器的使用要求，本文对焦平面装配的误差进行了理论分析，搭建了 CMOS星敏感器装配及标定测试系统，利用长焦距平行光管像面移动测量方法进行了星敏感器轴上和轴外的星点成像，获取了焦平面离焦量及倾斜数据。在这些数据指导下，成功完成了对某焦距 50 mm，相对孔径 1/1.25，全视场 20°的 CMOS星敏感器的焦平面装配，轴上点离焦小于 0.01 mm，倾斜小于 2′。对装配后的星敏感器在高精度气浮转台上进行了主距测试和畸变标定，标定计算得到主距为 49.77 mm，精度 0.007 2 mm。利用三阶多项式拟合的方法对系统畸变进行了修正，修正后的残余畸变对单个星点测量的精度影响可减小到 6.6″左右，满足高精度星敏感器的使用要求。

Focal plane’s misalignment is analyzed theoretically to match the requirement of high precision CMOS star sensor. System for assembly and calibrating measurement of CMOS star sensor is established. Defocusing distance and tilt of detector plane are acquired by on-axis and off-axis star sensor imaging test through collimator’s image plane moving. Some CMOS star sensor with 50 mm focal length, F/1.25, and 20° field of view is successfully assembled under direction of testing data. Defocusing distance is less than 0.01 mm, and tilt is less than 2′. Principal distance test and distortion calibration are done with measuring system. Principal distance is calculated to be 49.77 mm, and the error is 0.007 2 mm. Distortion of star sensor system is calibrated by third order polynomial fitting data, and the residual error caused by distortion can be reduced to 6.6″ when measuring single star.