光学观测中太阳夹角的分析与计算

Analysis and calculation of the sun angle in optical observation

摘要:

对影响光学观测效果的太阳夹角计算方法进行了研究。首先给出了太阳夹角的定义及计算公式。然后重点研究了太阳视位置的计算方法,比较了几种赤纬角计算方法,给出了一种改进的时角计算方法,实现了高精度的太阳视位置计算,并对其计算精度进行了分析。最后提出了在实际光学观测应用中的太阳夹角计算算法。实验表明,太阳视位置计算精度比传统数值近似方法高一个数量级,能够满足光学观测中太阳光照分析的需要。

Abstract:

The sun angle, which has a great influence on optical observation, is studied. First, the definition and the calculating equation of sun angle are given. Then, focusing on the sun visual position algorithm, a few method to compute declination angle are compared, and an improved method to compute hour angle is proposed, with its accuracy is analyzed. Finally, sun angle algorithm, which is used in optical observation, is put forward. Test results shows that the accuracy of sun angle algorithm is an order of magnitude higher than the traditional methods, thus satisfying the illumination analysis demand in optical observation.