顾及周期项的北斗卫星钟差建模与预报

Modeling and Forecasting of Beidou Satellite Clock Error Considering Periodic Items

以三种卫星轨道的北斗卫星精密钟差为数据源,在采用频谱分析诊断出钟差拟合残差的周期特性基础上,分析了不同类型轨道卫星钟差的周期性特征;为实现钟差拟合残差的周期拟合,讨论了不同阶数三角级数对建模精度的影响,继而采用顾及周期项的二次多项式模型进行钟差的建模与预报,分析比较了不同轨道类型卫星钟差的预报精度情况。

Taking the precise clock error of Beidou satellite in three satellite orbits as the data source,the periodic characteristics of clock error fitting residuals of different satellites are analyzed on the basis of spectrum analysis diagnosis.In order to achieve the periodic fitting of clock error fitting residuals,the influence of different order trigonometric series on the modeling accuracy is discussed,and then the quadratic polynomial taking into account the periodic term is adopted.Modeling and forecasting the clock error of the model,and analyzing and comparing the forecasting accuracy of the clock error of satellites with different orbital types.