Model Study of Time Delay and Phase Fringe Stopping in Satellite Observation of VLBI
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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 should be held in order to track and control it.Due to the self rotation and revolution of the earth,the description of relative motion between earth and satellite become complicated.And the time delay and 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.Time delay 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 the actual observational data and the changing trend of residual time delay and variance distribution,a better model of time delay compensation and fringe stopping is shown.
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Key words:
- VLBI /
- Correlation /
- Time delay /
- Fringe
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