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

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.