JASON-2??????λ????仯?????1 cm?????????

????JASON\|2????1 a?????????GPS?????????????????????в?????JASON\|2???????????λ????仯??PCV????????????????????????????????????JASON\|2??PCV?????в???????????????????PCV???JASON\|2??1 a?????????????????в????????????ζ???????JPL?????????????????????????????????????,????PCV???????JASON\|2????????????????????????????????3D RMS???2.5 cm??????RMS?1.0 cm????????

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

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\|1 satellite, the radial accuracy of the JASON\|2 orbit must be better than 1.5 cm, in order to continue the altimeter observations of T/P and JASON\|1 satellite. In this work, the antenna phase center variation of JASON\|2, based on residuals of GPS ionosphere\|free 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 2.5 cm and the RMS of radial direction of JASON\|2 reaches 1.0 cm.