测绘通报 ›› 2020, Vol. 0 ›› Issue (3): 78-82.doi: 10.13474/j.cnki.11-2246.2020.0082

• 技术交流 • 上一篇    下一篇

一种北斗卫星钟差短期预报新方法

柴伟杰1, 杭芬1, 刘国光2   

  1. 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
  • 收稿日期:2019-10-31 出版日期:2020-03-25 发布日期:2020-04-09
  • 通讯作者: 刘国光。E-mail:08cehui04@163.com E-mail:08cehui04@163.com
  • 作者简介:柴伟杰(1981-),男,讲师,工程师,主要从事工程测量、GNSS方面的教学工作。E-mail:lmly666888@126.com

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

CHAI Weijie1, HANG Fen1, LIU Guoguang2   

  1. 1. Department of Foundation Courses, Henan Construction Vocational and Technical College, Zhengzhou 450000, China;
    2. Guangzhou South Surveying and Mapping Science and Technology Company Limited, Guangzhou 510663, China
  • Received:2019-10-31 Online:2020-03-25 Published:2020-04-09

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。

关键词: 北斗卫星, 灰理论, 拟合推估, 三次样条插值, 两步极小

Abstract: 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.

Key words: BDS, grey theory, fitting, cubic spline interpolation, two step’s minimization

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