天文大气折射与映射函数的数值模拟

Numerical simulation between astronomical atmosphere refraction and mapping function

为了研究天文大气折射与中性大气折射延迟之间的内在联系,利用天文大气折射表的表列数据对大气折射延迟的映射函数进行了数值模拟。计算结果表明,用天文大气折射测定值模拟映射函数是可行的;同时也表明,映射函数的形式是次要的,随着连分式项数的增加可以提高模拟的精度。该结论对于改善大气折射数据处理的归算精度,降低仪器的观测截止角,和提高仪器的使用效应具有一定的参考价值和指导意义。

To study the inherent relation between astronomical atmosphere refraction and delay, this paper simulates the mapping function in atmosphere refraction delay making use of the tabular data of the atmospheric refraction table, The numerical value shows that the method is feasible for using the measured values of the astronomical atmospheric refraction to simulate in the mapping function. At the same time, it also shows that the form of mapping function is secondary and the accuracy of simulation can he improved with the increase in the number of terms of continued fractions. The conclusion has some reference value and instructional meaning for improving the computational accuracy of data processing, decreasing the instrumental observational cut-off elevating angle and increasing the availability factor of the instrument.