宇航学报

宇航学报 ›› 2012, Vol. 33 ›› Issue (10): 1401-1406.doi: 10.3873/j.issn.1000-1328.2012.10.006

• 制导、导航与控制 • 上一篇    下一篇

一种利用泛函网络进行导航卫星钟差预报的方法研究

王颖1, 徐波1,2, 杨旭海3   

  1. （1. 南京航空航天大学航天学院，南京 210016； 2. 南京大学天文与空间科学学院，南京 210093；

    3. 国家授时中心，西安 710600）

  • 收稿日期:2011-07-29 修回日期:2011-10-31 出版日期:2012-10-15 发布日期:2012-10-22
  • 基金资助:
    国家自然科学基金（11078001,11033004） 

Research on the Navigation Satellite Clock Error Prediction Using Functional Network

WANG Ying1, XU Bo1,2, YANG Xu-hai3   

  1. （1. College of Astronautics， Nanjing University of Aeronautics and Astronautics， Nanjing  210016， China； 2. School of Astronomy & Space Science， Nanjing University， Nanjing 210093， China；3. National Time Service Center， Xi’an  710600， China）
  • Received:2011-07-29 Revised:2011-10-31 Online:2012-10-15 Published:2012-10-22

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摘要： 为提高导航卫星钟差预报的精度和实时性，提出一种基于多项式和泛函网络相结合的钟差预报方法。该方法首先根据卫星钟的物理特性用多项式进行拟合，并用泛函网络对多项式拟合残差进行建模，其中泛函网络的结构是通过小波降噪及相空间重构的方法确定。最后以GPS卫星为例，进行四组短期预报实验。结果表明，所提方法能够实时有效地对导航卫星钟差进行拟合和预报，且精度优于IGUP星历。

关键词: 钟差预报, 泛函网络, 相空间重构, 小波降噪

Abstract: In order to improve the prediction accuracy and realtime performance of the navigation satellite clock error, a satellite clock error prediction method based on the combination of polynomial model and functional network is proposed in this paper. Firstly a polynomial model is used to fit the clock error series according to its physical property, and then the polynomial fitting residual is modeled based on the functional network, while the functional network structure is defined by using wavelet denoising and phase space reconstruction. Finally the GPS satellites are taken for example and four shortterm prediction tests are done, and the simulation results show that the proposed method can be used to fit and predict the clock error series effectively, whose prediction accuracy is better than that of
IGUP ephemeris.

Key words: Clock error prediction, Functional network, Phase space reconstruction, Wavelet denoising

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