Gravity recovery using COSMIC GPS data: Application of orbital perturbation theory

Chein-way Hwang*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

27 Scopus citations

Abstract

COSMIC is a joint Taiwan-US mission to study the atmosphere using the Global Positioning System (GPS) occultation technique. Improved formulas are developed for the radial, along-track, and cross-track perturbations, which are more accurate than the commonly used order-zero formulas. The formulas are used to simulate gravity recovery using the geodetic GPS data of COSMIC in the operational phase. Results show that the EGM96 model can be improved up to degree 26 using 1 year of COSMIC data. TOPEX/POSEIDON altimeter data are used to derive a temporal gravity variation. COSMIC cannot reproduce this gravity variation perfectly because of data noise and orbital configuration, but the recovered field clearly shows the gravity signature due to mass movement in an El Niño.

Original languageEnglish
Pages (from-to)117-136
Number of pages3
JournalJournal of Geodesy
Volume75
Issue number2-3
DOIs
StatePublished - 19 Jun 2001

Keywords

  • COSMIC
  • El niño
  • GPS
  • Orbit perturbation
  • Temporal gravity variation

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