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M. Weigelt, A. Jäggi , L. Prange, W. Keller, N. Sneeuw. Towards the time-variable gravity field from CHAMP. TexPoint fonts used in EMF. Read the TexPoint manual before you delete this box.: A A A A. Questions. Did we get everything out of the CHAMP data?

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towards the time variable gravity field from champ
M. Weigelt, A. Jäggi, L. Prange, W. Keller, N. SneeuwTowards the time-variable gravity field from CHAMP

TexPoint fonts used in EMF.

Read the TexPoint manual before you delete this box.: AAAA

questions
Questions

Did we get everything out of the CHAMP data?

Is the time variable gravity field really out of reach?

What do we learn for future satellite missions?

previous studies limitations
Previous studies & limitations

Degree RMS w.r.t. ITG-GRACE2010s

based on the energy balance approach

two years of GPS-data with 30 s sampling

no dealiasing products

no covariance information

refinements
Refinements

Acceleration approach:

  • three times the number of observations
  • three dimensional observations

Improved GPS positioning:

  • 10 s sampling
  • estimated absolute antenna phase center model
  • new IGS standards

Prange 2010

outliers vs poor observations
Outliers vs. poor observations
  • Typically threshold based outlier detection based on residuals:

?

?

?

?

  • Localizing outlier detection necessary
  • Consider (synthetical) covariance information
pushing the limits combination strategies
Pushing the limits – combination strategies

Standard case:

single month solution

+ Grace A andGrace B

Combining n-month

with unit weight

+ Grace A andGrace B

Combining n-month

with Bartlett weight

+ Grace A andGrace B

time series of coefficients
Time series of coefficients

C44

Correlation

C40

GRACE – GFZ Rl. 4

CHAMP + GRACE

Single coefficients

comparisoncapability

spatial pattern
Spatial pattern

October 2003:

February 2004:

conclusion
Conclusion
  • Did we get everything out of the data of CHAMP?

CHAMP still offers a wealth of information

  • Is the time variable gravity field really out of reach?

No, but processing needs further improvements

  • What do we learn for future satellite missions?

“Real” covariance information needed

Increase the number of observations

towards the time variable gravity field from champ1

THANK YOU

M. Weigelt, A. Jäggi, L. Prange, W. Keller, N. Sneeuw

Towards the time-variable gravity field from CHAMP

TexPoint fonts used in EMF.

Read the TexPoint manual before you delete this box.: AAAA

time variable signal
Time variable signal?

GRACE – GFZ Rl. 4

CHAMP + GRACE