球面三角形法在数字天顶仪中的应用

The Application of Spherical Triangle Method in Digital Zenith Camera

对测站点位置坐标进行解算时一般采用传统的切平面法,但切平面法的定位精度会因恒星测量误差等干扰而快速降低,并且数据的收敛速度较慢。采用球面三角形法,充分利用恒星影像的坐标信息,提高了定位精度和解算结果的收敛速度。

The tangent plane method is often used to calculate the astronomical coordinates of the tar- get point. However, star error can affect the the precision of orientation easily. Moreover, the meth- od is relatively slow. In order to improve the precision of the target point, we introduce a new method of spherical triangle, which can make full use of the star information. Thus, both precision and the speed are improved.