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Antenna Phase Center Variation Estimation of JASON-2 and Its Precise Orbit Determination towards 1cm

Yan Ma

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Abstract

JASON-2,which was launched on June 20,2008,has been in operation for more than 5 years.As the processor of T/P and JASON-1satellite,the radial accuracy of the JASON-2 orbit must be better than 1.5cm,in order to continue the altimeter observations of T/P and JASON-1satellite.In this work,the antenna phase center variation of JASON-2,based on residuals of GPS ionospherefree observations from January 1,2012 to December 31,2012,is modeled.The accuracy of the precise orbit of JASON-2 achieved with the reduced dynamic method is assessed by comparison with the precise orbit ephemeris(POE)from JPL,orbit overlaps,and post-fit residuals.Results show that strategies used by this paper can improve orbit accuracy and that the orbits achieved are stable and reliable.The 3D RMS of JASON-2 orbit difference is about 2.5cm and the RMS of radial direction of JASON-2 reaches 1.0cm.

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What this paper is about

JASON-2,which was launched on June 20,2008,has been in operation for more than 5 years.As the processor of T/P and JASON-1satellite,the radial accuracy of the JASON-2 orbit must be better than 1.5cm,in order to continue the altimeter observations of T/P and JASON-1satellite.In this work,the antenna phase center variation of JASON-2,based on residuals of GPS ionospherefree observations from January 1,2012 to December 31,2012,is modeled.The accuracy of the precise orbit of JASON-2 achieved with the reduced dynamic method is assessed by comparison with the precise orbit ephemeris(POE)from JPL,orbit overlaps,and post-fit residuals.Results show that strategies used by this paper can improve orbit accuracy and that the orbits achieved are stable and reliable.The 3D RMS of JASON-2 orbit difference is about 2.5cm and the RMS of radial direction of JASON-2 reaches 1.0cm.

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Available abstract

JASON-2,which was launched on June 20,2008,has been in operation for more than 5 years.As the processor of T/P and JASON-1satellite,the radial accuracy of the JASON-2 orbit must be better than 1.5cm,in order to continue the altimeter observations of T/P and JASON-1satellite.In this work,the antenna phase center variation of JASON-2,based on residuals of GPS ionospherefree observations from January 1,2012 to December 31,2012,is modeled.The accuracy of the precise orbit of JASON-2 achieved with the reduced dynamic method is assessed by comparison with the precise orbit ephemeris(POE)from JPL,orbit overlaps,and post-fit residuals.Results show that strategies used by this paper can improve orbit accuracy and that the orbits achieved are stable and reliable.The 3D RMS of JASON-2 orbit difference is about 2.5cm and the RMS of radial direction of JASON-2 reaches 1.0cm.

Key concepts: Ephemeris, Phase center, Geodesy, Orbit determination, Orbit (dynamics), Global Positioning System, Variation (astronomy), Altimeter

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