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

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Gravity recovery using COSMIC GPS data
application of orbital perturbation theory
Cheinway Hwang Department of Civil
Engineering National Chiao Tung University,
Hsingchu, Taiwan Presented by Ming
Yang Department of Surveying Engineering National
Cheng Kung University, Tainan, Taiwan COSMIC
workshop, Aug 21-23, 2002, Boulder, CO, USA
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Methods and use of COSMIC gravity
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Corrected sea level anomaly in January, 1998,
peak of El Niño
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Oceanic mass induced geoid change during
1997-1998 El Niño
Degree 5
Degree 15
Degree 50
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Gravity harmonic coefficient variation due to
oceanic mass (thermal effect not removed)
C00
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C10
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C20
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C30
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C40
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C50
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C60
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Cosmic-derived geoid variation, standard
deviation 3 cm at 1 per minute
Degree 5
Degree 15
Degree 50
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COSMIC-derived geoid change during 1997-1998 El
Niño, improved signal-noise ratio, std dev 1cm
Degree 5
Degree 15
Degree 50
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CONCLUSIONS

• In the 5-yr operational phase from 2006 to 2010,
  COSMIC can contribute to the monitoring of the
  temporal variations in the gravity field for
  global-change researches and El Niño studies.
• We are establishing the capability to estimate
  gravity field while computing precise COSMIC
  orbits.