EGU2020-12622
https://doi.org/10.5194/egusphere-egu2020-12622
EGU General Assembly 2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

A Hybrid-Precision Numerical Orbit Integration Technique for Next Generation Gravity Missions

Yufeng Nie1, Yunzhong Shen1, and Qiujie Chen1,2
Yufeng Nie et al.
  • 1College of Surveying and Geo-Informatics, Tongji University, Shanghai 200092, China (yzshen@tongji.edu.cn, yufeng.nie@tongji.edu.cn)
  • 2Institute of Geodesy and Geo-information, University of Bonn, 53115 Bonn, Germany (chenqiujie2009@163.com)

In Next Generation Gravity Missions (NGGM) the Laser Ranging Interferometer (LRI) is applied to measure inter-satellite range rate with nanometer-level precision. Thereby the precision of numerical orbit integration must be higher or at least same as that of LRI and the currently widely-used double-precision orbit integration technique cannot meet the numerical requirements of LRI measurements. Considering quadruple-precision orbit integration arithmetic is time consuming, we propose a hybrid-precision numerical orbit integration technique, in which the double- and quadruple-precision arithmetic is employed in the increment calculation part and orbit propagation part, respectively. Since the round-off errors are not sensitive to the time-demanding increment calculation but to the least time-consuming orbit propagation, the proposed hybrid-precision numerical orbit integration technique is as efficient as the double-precision orbit integration technique, and as precise as the quadruple-precision orbit integration. By using hybrid-precision orbit integration technique, the range rate precision is easily achieved at 10-12m/s in either nominal or Encke form, and furthermore the sub-nanometer-level range precision is obtainable in the Encke form with reference orbit selected as the best-fit one. Therefore, the hybrid-precision orbit integration technique is suggested to be used in the gravity field solutions for NGGM.

How to cite: Nie, Y., Shen, Y., and Chen, Q.: A Hybrid-Precision Numerical Orbit Integration Technique for Next Generation Gravity Missions, EGU General Assembly 2020, Online, 4–8 May 2020, EGU2020-12622, https://doi.org/10.5194/egusphere-egu2020-12622, 2020

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