顾及周期项误差和起点偏差修正的北斗卫星钟差预报

发布时间：2018-01-14 16:31

本文关键词：顾及周期项误差和起点偏差修正的北斗卫星钟差预报　出处：《测绘学报》2016年S2期 　论文类型：期刊论文

更多相关文章： 卫星钟差 谱分析 主周期 钟差预报

【摘要】：根据北斗卫星导航系统星载原子钟自身的物理特性,采用武汉大学IGS数据中心发布的2016年1月1日至2016年11月1日共306天的事后钟差产品进行谱分析。分析结果表明:北斗卫星导航系统的3类卫星钟都存在一定的周期特性;其中GEO和IGSO卫星钟的主周期相对较为明显;GEO卫星钟的主周期依次为12、24、8和6h;IGSO的主周期为24、12、8和6h;而MEO的3个主周期为12.9、6.4和24h。依据各类原子钟的周期特性,同时对各天之间钟差的起始点偏差进行修正,并利用修正模型对北斗卫星钟差进行预报和精度分析。试验结果表明,改进的预报模型能显著提升北斗卫星的钟差预报精度,北斗卫星钟差24h、12h、6h的平均预报精度分别能达到6.55ns、3.17ns和1.76ns。
[Abstract]:According to the physical characteristics of spaceborne atomic clock in Beidou satellite navigation system. The spectrum analysis was carried out by using the IGS data Center of Wuhan University, which issued a 306-day post-mortem clock difference product from January 1st 2016 to November 2016. The results show that:. The three kinds of satellite clocks of Beidou satellite navigation system have certain periodic characteristics. The main periods of GEO and IGSO satellite clocks are relatively obvious. The main periods of GEO satellite clock are 12 ~ 24 ~ 8 and 6 h respectively. The main periods of IGSO were 24 ~ 12g / 8 and 6 h; The three main periods of MEO are 12.9 and 24h. according to the periodic characteristics of various atomic clocks, the starting point deviation of clock difference between different days is corrected at the same time. The modified model is used to forecast and analyze the accuracy of Beidou satellite clock difference. The experimental results show that the improved prediction model can significantly improve the prediction accuracy of Beidou satellite clock difference, and the Beidou satellite clock difference is 24 h or 12 h. The average prediction accuracy of 6 h can reach 6.55 nsL 3.17 ns and 1.76 ns, respectively.
【作者单位】：长安大学;山东大学;地理信息工程国家重点实验室;青岛农业大学;
【基金】：国家自然科学基金(41574013) 国家重点研发计划(2016YFB0501701)~~
【分类号】：P228.4
【正文快照】： 高精度的卫星钟是导航定位系统的基础,卫星钟参数的预报精度直接影响导航系统的服务性能。现阶段的研究表明,星载原子钟相当敏感,极易受到外界或自身物理性能的影响,从而很难了解其细致的变化规律,使得卫星钟差的高精度预报变得极为困难[1-2]。为了提高卫星钟差预报精度,国内

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