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TOWARDS THE TIME-VARIABLE GRAVITY FIELD FROM CHAMP M. Weigelt, A. Jäggi, L. Prange, W. Keller, N. Sneeuw TexPoint fonts used in EMF. Read the TexPoint.

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Presentation on theme: "TOWARDS THE TIME-VARIABLE GRAVITY FIELD FROM CHAMP M. Weigelt, A. Jäggi, L. Prange, W. Keller, N. Sneeuw TexPoint fonts used in EMF. Read the TexPoint."— Presentation transcript:

1 TOWARDS THE TIME-VARIABLE GRAVITY FIELD FROM CHAMP M. Weigelt, A. Jäggi, L. Prange, W. Keller, N. Sneeuw TexPoint fonts used in EMF. Read the TexPoint manual before you delete this box.: A AAA

2 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? 2

3 Previous studies & limitations based on the energy balance approach two years of GPS-data with 30 s sampling no dealiasing products no covariance information 3 Degree RMS w.r.t. ITG-GRACE2010s

4 Processing refinements

5 Refinements 5 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

6 Outliers vs. poor observations 6 Typically threshold based outlier detection based on residuals: ? ? ? ? Localizing outlier detection necessary Consider (synthetical) covariance information

7 Results using outlier detection 7

8 CHAMP vs. GRACE monthly solutions 8

9 Monthly solutions

10 Pushing the limits – combination strategies 10 Standard case: single month solution Combining n-month with unit weight Combining n-month with Bartlett weight + Grace A and Grace B

11 Comparison of combination strategies 11

12 CHAMP-only solution with Bartlett option 12

13 Adding GRACE … 13

14 Results for CHAMP + GRACE 14

15 Time series of coefficients 15 C 40 C 44 Correlation Single coefficients comparison capability GRACE – GFZ Rl. 4 CHAMP + GRACE

16 Spatial pattern 16 October 2003: February 2004:

17 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 17

18 TOWARDS THE TIME-VARIABLE GRAVITY FIELD FROM CHAMP M. Weigelt, A. Jäggi, L. Prange, W. Keller, N. Sneeuw TexPoint fonts used in EMF. Read the TexPoint manual before you delete this box.: A AAA THANK YOU

19 Appendix

20 Time variable signal? 20 GRACE – GFZ Rl. 4 CHAMP + GRACE

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