图像全站仪相机的一种快速标定方法

A fast calibration method for image total station camera

针对快速天文测量中像素坐标与度盘坐标之间的高精度转换问题,通过引入水平角转换调节参数,构建了一个高精度的像素坐标与度盘坐标之间的转换模型。介绍了构建新模型的基本思路和标定的操作过程;利用图像全站仪的室内标定数据解算了模型转换参数,并与多种转换模型进行了对比;针对经过该模型转换后的度盘坐标和星间角距的精度,以及星间结构的稳定性,提出了3种检验方法。实验表明:与传统光学标定法相比,该文给出的方法能够明显提高天文观测原始数据的精度,且计算量小,效率更高。另外,操作者无需过多专业背景,理论上减小了因高度角变化引起的水平角测量偏差。

According to the high-precision conversion between pixel coordinates and dial coordinates in rapid astronomical measurements, this paper constructs a high-precision conversion model between pixel coordinates and dial coordinates by introducing horizontal angle conversion adjustment parameters. Firstly, the basic idea of building a new model and the operation process of calibration are introduced;then, the model conversion parameters are calculated by using the indoor calibration data of the image total station, and compared with various conversion models;finally, three inspection methods are proposed for the accuracy of the dial coordinates and the angular distance between the stars after the transformation of the model, as well as the stability of the inter-satellite structure. Experiments show that, compared with the traditional optical calibration method, the method presented in this paper can significantly improve the accuracy of the original data of astronomical observations, with less computation and higher efficiency. In addition, the operator does not need too much professional background, which theoretically reduces the horizontal angle measurement deviation caused by the change of the altitude angle.