Analysis Of The Influence Of GPS Antenna Phase Center Correction On Precise Orbit Determination Of JASON-3 Satellite

Marine ecosystem as the largest ecosystem on the earth,changes in the marine environment will have a significant impact on human material production activities.Therefore,it is very important to monitor the marine environment efficiently and in real time.JASON-3 satellite provides high-precision data for ocean current research and sea-level measurement,and can monitor climate change and marine environment.High-precise orbit determination is the prerequisite for the implementation of scientific research tasks.As a high-precision,all-weather and low-cost orbit determination technology,spaceborne GPS technology is widely used in precision orbit determination of low earth orbit satellites.Based on the reduced-dynamic orbit determination method,this thesis uses the JASON-3 satellite-borne GPS data to determine the precise orbit of the satellite,and focuses on the influence of the antenna phase center model of the spaceborne GPS receiver on the precise orbit determination of JASON-3 satellite.The main contents of this thesis are as follows:(1)According to the factors affecting the precise orbit determination of JASON-3 satellite,the orbit parameters of JASON-3 satellite are given.This thesis introduces all kinds of sensors carried by JASON-3 satellite to realize its scientific research task.(2)The theory of PCO and PCV model on-orbit estimation of spaceborne GPS receiver antenna is discussed in detail.Experiments are carried out on the measured spaceborne GPS observation data of GRACE-A,GRACE-B,SWARM-A,SWARM-B and SWARM-C satellites to verify the feasibility of PCO model in-flight estimation and PCV model in-flight estimation using direct method and residual method.(3)According to the factors such as the mass and orbit parameters of JASON-3 satellite,the appropriate orbit determination strategy is made,and the reduced-dynamic orbit determination method is used to determine the precise orbit of JASON-3 satellite.The reduced-dynamic orbit is checked by overlapping orbit comparison,phase observation residual analysis and scientific orbit comparison.(4)On the basis of realizing the precise orbit determination task of JASON-3 satellite,the antenna phase center model of spaceborne GPS receiver of JASON-3 satellite is estimated.During the PCO model in-flight estimation,it is found that the PCO loss has a strong coupling with other orbit parameters in the x-axis direction and y-axis direction,and only the z-axis PCO in-flight estimation is feasible.When estimating the PCV model in-flight,the direct method and the residual method are used to analyze the influence of the PCV model obtained by the two methods on the precise orbit determination of JASON-3 satellite,and the advantages and disadvantages of the two methods are discussed.