›› 2015, Vol. 35 ›› Issue (2): 1-.doi: 10.3780/j.issn.1000-758X.2015.02.001

• 研究探讨 •    下一篇

“北斗”导航卫星定轨残差特征提取与分布检验

  

  1. 1 北京航天飞行控制中心,北京 100094)(2 航天飞行动力学技术国家级重点实验室,北京 100094
  • 出版日期:2015-04-25 发布日期:2015-04-25

Feature Extraction and Distribution Test for Orbit Residuals in Beidou Navigation Satellite

  1. (1 Beijing Aerospace Control Center, Beijing 100094)(2 National Key Laboratory of Science and Technology on Aerospace Flight Dynamic, Beijing 100094)
  • Online:2015-04-25 Published:2015-04-25

摘要: 针对“北斗”导航卫星定轨残差中非建模系统误差问题,提出基于总体平均经验模式分解(EEMD)与Hilbert谱分析相结合的定轨残差特征提取方法,并对定轨残差正态分布特性进行卡方检验。首先,分析总体经验模式分解原理,提出滤波辅助的改进EEMD方法与Hilbert谱特征提取结合,建立定轨残差特征提取模型,并阐述卡方检验正态分布原理;然后对北斗导航卫星伪距与载波相位数据定轨残差特征进行分析;最后将提出的方法应用于多测站、多北斗GEO卫星的定轨残差分析中。结果表明,EEMD与Hilbert谱方法有效提取出了定轨残差中1天的轨道周期项,且EEMD处理后定轨残差的卡方统计量为5.5,其值小于卡方检验临界,可视为正态分布。该方法可为北斗定轨残差中非建模系统误差分离、提高定轨内符合精度提供有效技术手段。

关键词:

Abstract: To analyze the no-modeling system error of orbit residuals in COMPASS, the orbit residuals feature extraction method with the ensemble empirical mode decomposition (EEMD) and Hilbert spectrum was proposed, and the normal distribution character of the orbit residuals chi-square test was analyzed. Firstly, the feature extraction principle of EEMD and Hilbert spectrum was introduced, the EEMD method assisted by the filter was proposed, and the feature extraction model of orbit residuals was established. Secondly, the feature of Pseudo-range and carrier phase orbit residuals in COMPASS was analyzed. Finally, the EEMD and Hilbert spectrum method was applied to analyze the Beidou GEO satellite orbit residuals. The results show that EEMD and Hilbert method can accurately extract the features of 1 day period, which is related to Beidou orbit running period. The chi-square value of the post orbit residuals obtained by EEMD is 5.5, which is smaller than the critical value of chi-square test. It proves that the post orbit residuals are normal distribution. The proposed method is important for separating the no-modeling system error in Beidou navigation satellite orbit residuals to improve the orbit determination precision.

Key words: font-size: 10pt, mso-font-kerning: 1.0pt, mso-ansi-language: EN-US, mso-fareast-language: ZH-CN, mso-bidi-language: AR-SA, mso-fareast-font-family: 宋体" lang="EN-US">Orbit residuals, Feature extraction, Distribution test, Pseudo-range, Carrier phase, Ensemble empirical mode decomposition, COMPASS