卫星地球站日凌时间计算方法

日凌是太阳辐射在春秋分前后一段时间内对卫星通信产生严重干扰的一种现象。日凌的影响是难以避免的，但其发生时间是可以预测的，准确预报日凌发生的日期和时间，可以使重要业务通信尽量避开“日凌中断通信”的时间，避免日凌对业务的影响。在已有文献工作基础上，结合太阳位置精确算法和球面三角分析方法，提出了一种日凌发生时间计算方法，并设计了计算程序。通过比对计算结果与实际观测数据，验证了该算法的准确性和科学性。

Calculating Method of Time for Solar Transit of Satellite Earth Station

As a phenomenon,solar transit appears when solar radiation has a serious interference impact on satellite communica-tion around the spring equinox or the autumnal equinox. It is impossible to avoid the influence of solar transit,but it is possible to fore-cast the date and time when solar transit appears.The accurate forecast of the date and time when solar transit appears,can not only make important service communication avoid the time when solar transit makes communication break off,but also avoid the influence of solar transit on service. A new calculating method of time for solar transit is proposed and the calculation process is designed in this paper,which combines the sun location accurate algorithm and the spherical trigonometry analysis method. Finally,the accuracy and sci-entificalness of the new algorithm are tested and verified by comparing the calculation results with the actual observation data.