Journal of Astronautics ›› 2012, Vol. 33 ›› Issue (10): 1391-1400.doi: 10.3873/j.issn.1000-1328.2012.10.005

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Jason2 Precise Orbit Determination with DORIS/SLR Tracking Data

PENG Dong-ju, WU Bin, QU Wei-jing   


  1. (Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai  200030, China)
  • Received:2011-08-10 Revised:2012-07-18 Online:2012-10-15 Published:2012-10-22

Abstract: The DORIS instrument called DGXX on Jason2 satellite is the first of the third generation. Compared to the previous two generations, both data efficiency and tracking capability of DGXX have been improved significantly. Firstly, transformation between phase data of DGXX and traditional Doppler data is described in this paper, and then the accuracies of orbits determined by using DORIS data only and DORIS data combined with SLR data are assessed through various methods including postfit RMS comparison, orbit overlapping validation, independent orbit comparison and SLR validation. In addition, considering if real meteorological data of some stations are not available or inaccurate, that the accuracy of the troposhperic delay correction model can be affected the use of a new Global Pressure and Temperature (GPT) model in DORIS precise orbit determination (POD) is therefore discussed in this paper. It is demonstrated that the orbit accuracy with GPT model and real meteorological data is at the same level, therefore GPTderived data is an eligible substitute once some real meteorological data are missing. Apart from that, Both orbit solutions with DORIS only data and DORIS combined with SLR data can reach 1 cm accuracy level at radial direction, the one with both DORIS and SLR data is slightly better than that with DORIS data only. The main contribution of SLR data to DORIS+SLR POD is to reduce the correlation between those two types of parameters of zenith tropospheric delay and DORIS frequency drift; longstable POD can benefit from this particular advantage.

Key words: Jason2, DORIS, SLR, Precise orbit determination, GPT

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