三线阵CCD航天立体测绘相机交会角稳定性标定技术

Calibration technology of intersection angle stability for the three-line array CCD space stereo mapping camera

三线阵CCD航天立体测绘相机的交会角稳定性是保证高精度立体测绘的关键指标,新一代测绘相机研制前,需要首先解决其稳定性标定的基础问题.本文提出一种采用高精度自准直经纬仪交会测量的标定方法,以解决多光学传感器复杂系统光轴交会角稳定性的高精度标定问题.该方法采用4台精度为0.5″的自准直经纬仪对测绘相机上的基准立方镜两个正交平面进行正倒镜自准测量,再进行正倒镜互瞄,通过多测回解算求得立方镜之间的转换矩阵.实验结果表明,该标定方法重复性精度0.5″,闭合环标定精度达到1″量级.实际标定结果表明测绘相机力学试验前后,交会角最大变化量为5.1″,满足稳定性小于10″的指标要求.

Stability of three-dimensional mapping spacecraft CCD line array camera is to ensure that high-precision three-dimensional mapping of key indicators.Development of a new generation of mapping camera before,it's need to solve basic problems calibration stability.Paper proposes a high-precision self-collimation theodolite intersection measurement calibration method,to solve the multi-axis optical sensor complex system stability intersection angle precision calibration problem.The method uses a precision of 0.5"to 4 self-collimation theodolite reference mirror cube mapping camera on two orthogonal planes were being inverted microscope auto-collimation measurements.Then pour mutual aim being,and through multiple rounds calculable transformation matrix between the cubic miror.Analysis and validation experiments show that,the calibration method repeatability is 0.5″,and closed loop calibration accuracy of a 1″middleweight.The actual mapping camera calibration results show that the mechanical tests before and after,the maximum change in contact angle of 5.1″,which meet the requirements of the stability index of less than 10″.