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卫星VLBI观测时延和相位条纹旋转模型研究

Model Study of Time Delay and Phase Fringe Stopping in Satellite Observation of VLBI

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【作者】 夏海波

【Author】 XIA Haibo (Shanghai Astronomical Observatory,The Chinese Academy of Sciences,Shanghai 200030)

【机构】 中国科学院上海天文台 VLBI 研究室 上海200030

【摘要】 空间卫星在绕地球或月球等星体运行时,为了跟踪和控制卫星就要时刻掌握其在空间的位置和运动状态.但由于地球的自转和公转使得卫星和地球之间的相对运动描述关系变得复杂,目标卫星相对地球任意两个观测站的时间差(时延)和多普勒频移(相关条纹旋转)时刻都在改变.VLBI 相关处理机是卫星观测和空间探测极为重要的技术手段,其原理以 FX 和 XF 两种相关模型处理观测数据.以 FX 相关模型为基础修正VLBI 观测数据的时延补偿和相关条纹旋转的模型,提出对称“1/n Multiplier”时延补偿模型和条纹旋转模型,并且对实际观测数据进行操作和详细分析,对相关相位谱的剩余时延变化趋势和方差分布进行分析,从中找出优选时延补偿和条纹旋转模型.对于精确描述卫星轨道运动状态提供更准确的方法.

【Abstract】 When satellite moves around the earth or moon,its position and moving behavior shouldbe held in order to track and control it.Due to the self rotation and revolution of the earth,thedescription of relative motion between earth and satellite become complicated.And the time delayand Doppler shift of an aimed satellite that relative to any two observation sites change at all times.VLBI correlation processor is a key technical instrument in space probing and satellite observation.The principle of correlation model of FX and XF is used to deal with observational data.Timedelay and fringe stopping of VLBI correlation model is modified based on FX model,and a mirror“1/n Multiplier”model of time delay and fringe stopping is brought foward.Through analysis of theactual observational data and the changing trend of residual time delay and variance distribution,abetter model of time delay compensation and fringe stopping is shown.

【关键词】 VLBI相关时延条纹
【Key words】 VLBICorrelationTime delayFringe
  • 【文献出处】 空间科学学报 ,Chinese Journal of Space Science , 编辑部邮箱 ,2005年01期
  • 【分类号】P228.6
  • 【被引频次】4
  • 【下载频次】163
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