运用数字天顶仪对测站点位置进行定位是一种高精度的天文定位方法。在对测站点位置解算的过程中, 缺少一种对星点数据进行有效筛选的方法。往往直接对实验获得的星点数据进行处理, 影响了最终的定位精度。为了解决上述问题, 提出了一种星点筛选的方法, 该方法以残差为研究对象, 运用格罗布斯准则, 在迭代计算的过程中反复对星点数据进行筛选, 然后再使用最小二乘算法进行解算。实验数据的处理结果剔除了部分含有粗大误差的星点, 提高了解算数据的可靠性, 使定位的精度提高了大约5 m。

Using digital zenith instrument for positioning the observation station is an astronomical positioning method with high accuracy.In calculating the position of observation station,there lacks an effective method for screening the star data.Direct processing of the star data obtained from experiment always has an influence on the final positioning accuracy.In order to solve the above problems,a method for star screening is proposed.With residual error as the object of study,it uses Grubbs criterion for repeating screening of star data in iterative computation,and then uses the least square algorithm for calculation.The processed result of experimental data has rejected the stars with gross error and improved the reliability of calculated data,which can improve the positioning accuracy by about 5 m.