在卫星探测相机及星敏感器的地面标定实验中，需要一台能够模拟无穷远处极小星点以及极弱星光照度的光源，即星光模拟器。采用积分球均匀点光源加准直平行光管模拟出无穷远处的星点，使用可变光阑调节光能量动态范围，提高模拟星等。同时点光源的光亮度可以精确测定，再通过精确测量影响星等照度的各个因素，从而解决弱光情况下的标定问题。分析模拟器的模拟星等能力及精度，在现有加工测试条件下，星光模拟器能够满足模拟6～14星等照度要求且精度较高，完全满足地面标定实验需求。

In order to calibrate and test the space object cameras and star trackers, a starlight simulator which can simulate the minimum objects at infinite distance and the light source with weak starlight illuminance is required. In this way，the space object camera and star sensor can be calibrated in the laboratory and the effect of atmospheric variation can be reduced. The starlight simulators are made of the integrating sphere uniform point source and collimator, which can adjust the dynamic range of the light energy with iris diaphragm, raise the simulation star magnitude, detect the illuminance of point sources accurately, and then solve the problem of calibration under the condition of weak light by precisely measuring all the factors which influence the illuminance of the star magnitude. The performance and accurate of the starlight simulator are analyzed. It meets the requirement of calibration and test for the space object camera and star trackers in the laboratory.