Journal of Astronautics ›› 2014, Vol. 35 ›› Issue (3): 269-276.doi: 10.3873/j.issn.1000-1328.2014.03.004

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Influences of Different Interpolation Methods on Accuracy of Next Generation Satellite Gravity Recovery

ZHENG Wei,  XU Hou ze,  ZHONG Min,  LIU Cheng shu   

  1. State Key Laboratory of Geodesy and Earth’s Dynamics, Institute of Geodesy and Geophysics,Chinese Academy of Sciences, Wuhan 430077, China
  • Received:2013-03-04 Revised:2013-08-08 Online:2014-03-15 Published:2014-03-25

Abstract:

The demonstration researches on the next generation Earth’s gravitational field recovery from GRACE Follow On are carried out in this paper. Firstlly, based on the six point Lagrange and Taylor intersatellite range rate interpolation methods, using orbital parameters (orbital altitude of 250〖KG*9〗km, intersatellite range of 50〖KG*9〗km, orbital inclination of 89° and orbital eccentricity of 0.001) and the matching accuracies of key payloads (10 -7 〖KG*9〗m/s in intersatellite range rate of the interferometric laser ranging system, 10 -3 〖KG*9〗m in orbital position and 10 -6 〖KG*9〗m/s in orbital velocity of the GPS receiver, and 10 -11 〖KG*9〗m/s 2 in non conservative force of the accelerometer), the next generation Earth’s gravitational field from GRACE
Follow On is precisely and rapidly recovered; At degree 120, cumulative geoid height errors are 1.53×10 -3 〖KG*9〗m and 2.51×10 -3 〖KG*9〗m, respectively. Secondly, since the accuracy of the Earth’s gravitational field by the six point Lagrange intersatellite range rate interpolation method is about 2 times higher than that by the six point Taylor intersatellite range rate interpolation method, the sensitivity of the Lagrange intersatellite range rate interpolation method to the accuracy of the Earth’s gravitational feild recovery surpasses that of the Taylor intersatellite range rate interpolation method.

Key words: GRACE Follow on satellites, Lagrange and Taylor intersatellite range rate interpolation methods, Satellite gravity recovery, Earth gravitational field

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