航天CCD相机焦面位置地面标定方法研究

Terrestrial calibration method of focal plane position of space CCD camera

为了在地面试验阶段准确标定出航天CCD相机在轨成像时的像面位置,提出了一种基于自准直干涉测量原理和调制传递函数测量原理的航天CCD相机焦面位置的地面标定方法。介绍了该方法的原理和实施过程,并以口径1m、焦距20m的平行光管标定口径600mm、焦距6m的航天CCD相机为例,分析并计算了新标定方法和已有标定方法的标定精度。结果表明:新标定方法的标定精度优于0.006mm,是已有标定方法标定精度的5倍至10倍,能够满足现阶段所有航天CCD相机的焦面位置的标定精度要求。

In order to calibrate the focal plane position of a space charge-coupled device(CCD)camera in terrestrial measurement stage,we proposed a novel calibration method based on the principle of autocollimation interferometry and modulation transfer function(MTF)measurement.We introduced the principle and the implementation process of the proposed method,and taking the calibration of focal plane position of a space CCD camera with a aperture of 600 mm and a focal length of 6mby a collimator with a diameter of 1mand a focal length of 20 m as an example,analyzed and calculated the calibration precision of the novel calibration method and the existed calibration method.The results show that the precision of the novel calibration method is better than 0.006 mm,which is 5times^10times of the existed calibration method,and this precision of the novel calibration method could meet the requirement on the calibration precision of the focal plane position of all the space CCD cameras at this stage.