一种北斗卫星钟差短期预报新方法  

A new method for short-time prediction of BDS clock difference

作　　者：柴伟杰[1] 杭芬 刘国光 CHAI Weijie;HANG Fen;LIU Guoguang(Department of Foundation Courses,Henan Const met ion Vocational and Technical College,Zhengzhou 450000,China;Guangzhou South Surveying and Mapping Science and Technology Company Limited,Guangzhou 510663,China)

机构地区：[1]河南建筑职业技术学院,河南郑州450000 [2]广州南方测绘科技股份有限公司,广东广州510663

出　　处：《测绘通报》2020年第3期78-82,共5页Bulletin of Surveying and Mapping

摘　　要：为提高北斗卫星的定位与授时精度,必须准确计算出卫星钟差数值。本文考虑北斗卫星钟差中随机部分误差的影响,尝试建立北斗卫星钟差拟合推估模型,根据拟合推估两步极小解法解算该模型,在求解协方差函数系数中,依据模型残差拟合多项式系数;并与常用的灰理论模型、拟合推估的正常解法钟差预报模型结果进行比对,算例结果表明了两步极小解法及拟合推估模型在北斗卫星钟差短期预报方面的有效性。In order to improve the positioning and timing accuracy of BDS,it is necessary to calculate the satellite clock difference accurately. Considering the influence of random part error in clock difference of BDS,the prediction model of clock difference is established by fitting estimation. The model is solved by two-step minimization method based on fitting estimation. In solving covariance function coefficients,the polynomial fitting coefficients are fitted by model residual. Finally,the results of the model are compared with those of the grey theory model and the normal method of fitting and estimating. The experimental results show that the model is effective and applicable in the short-term prediction and interpolation of the clock difference of BDS.

关 键 词：北斗卫星 灰理论 拟合推估 三次样条插值 两步极小 

分 类 号：P228[天文地球—大地测量学与测量工程]