Determination of earth gravity field model from GPS phase double-different data onboard CHAMP

Jinyun Guo*, Chein-way Hwang, Jianguo Hu, Jiancheng Li

*Corresponding author for this work

Research output: Contribution to journalArticle

4 Scopus citations

Abstract

The satellite-ground double differential phase observation of onboard GPS is given to determine the earth gravity model from GPS phase data onboard CHAMP and observations of 48 IGS tracking sites. The Cowell II numerical orbit integration and the partitioned Bayesian least squares estimation are used to calculate the spherical harmonic coefficients of the earth gravity field to 70 degrees. The maximum difference of geoid undulation between the model and EGM96 (to 70 degrees) is 2.872 m. The difference accuracy of geoid undulation is 0.522 m and the average difference is -0.003 m. These indicate that there is no systematic difference between the model and EGM96.

Original languageEnglish
Pages (from-to)11-14
Number of pages4
JournalGeomatics and Information Science of Wuhan University
Volume32
Issue number1
StatePublished - 5 Jan 2007

Keywords

  • CHAMP
  • Earth gravity model
  • GPS data onboard satellite
  • Geoid undulation

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