超大视场天顶仪旋转轴偏差的检测

Detection of Rotation Axis Error of the Zenith Camera with Large Field of View

测站垂直基准信息的准确获取是高精度天文定位定向的基础,必须通过测量设备轴系偏差的补偿才能实现。对一种超大视场天顶仪旋转轴偏差检测的方法进行研究。通过获取测量设备绕旋转轴旋转180°前后的图像,给出了旋转轴偏差与同名像点图像坐标之间的映射关系,构建了旋转轴偏差的标准解算模型,并通过误差分析提出了改进模型。仿真实验表明:解算模型可有效检测出旋转轴偏差。经改进模型处理后,水平角的计算精度提高了26%,高度角的计算精度提高了15%。

The accurate acquisition of vertical reference information of the station is the basis for high-precision celestial positioning orientation,and must be achieved by compensating for the axis error of the measuring equipment.A detection method of rotation axis error for large field of view zenith camera is studied.The mapping relationship between the rotation axis error and the coordinates of the point image of the same name is given by obtaining the image before and after the measurement device rotates 180°around the rotation axis.Then the standard solution model of the rotation axis error is constructed,and an improved model is proposed through error analysis.Simulation experiments show that the solution model can effectively detect the rotation axis error,and after improved model processing,the calculation accuracy of the horizontal angle is increased by 26%,and the calculation accuracy of the height angle is increased by 15%.