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Quality Control of GFZ Orbit Predictions

Daniel Koenig, Roland Schmidt, Rolf Koenig. Quality Control of GFZ Orbit Predictions. Characterisation of Predicted Orbits Quality Control Improvement of CHAMP Orbit Predictions. Contents. last observation. Time Advance. 3h 6h 9h ... 48h.

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Quality Control of GFZ Orbit Predictions

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  1. Daniel Koenig, Roland Schmidt, Rolf Koenig Quality Control of GFZ Orbit Predictions

  2. Characterisation of Predicted Orbits Quality Control Improvement of CHAMP Orbit Predictions Contents

  3. last observation Time Advance 3h 6h 9h ... 48h Observed Part Predicted Part PDO radial cross-track True Orbit (RSO) along-track/ Time Bias Characterisation of PDOs for CHAMP and GRACE-A/-B

  4. Change to new gravity field EIGEN-CG01C-2 Quality of Observed Part (Orbit Fit): CHAMP Laser Residuals

  5. Change to new gravity field EIGEN-CG01C-2 Quality of Observed Part (Orbit Fit): GRACE-A Laser Residuals

  6. Quality of Predicted Part: Orbit Comparison to RSOs Histogram of Orbit ErrorsBetween Predicted Part and RSO Satellite: CHAMPPeriod: 03/2005Component: Time BiasTime Advance: 9h Mean : -0.57 ms Sigma : 11.64 ms Min : -32.37 ms Max : 31.42 ms Rate of inner class: 60.0 %

  7. Improvement of CHAMP Orbit Predictions – Results – Rate of Time Bias in [-10ms, +10ms] from Histograms Satellite: CHAMP Period: 09/2004

  8. Improvement of CHAMP Orbit Predictions – Results – Rates of Time Bias in [-10ms, +10ms] from Histograms Satellite: CHAMP Period: since 05/2001 Time Advance: 9h

  9. Summary • Operational quality control of CHAMP and GRACE predictions by comparison to precise RSOs. • Evaluation of orbit differences for CHAMP based on histograms for 09/2004 shows: • that more than 90 percent of the predictions are within a time bias of [-10ms, +10ms] up to 6 hrs after the last data point, and • that in the interval 9 to 12 hrs the aging of the predictions is most pronounced. However, still about 50 percent are within the requirement of [-10ms, +10ms] . • Thus updating at 8h intervals (3 predicts/day) is currently still sufficient. • On the other hand, the quality of CHAMP predictions, in particular in the critical time interval of 9 to 12 hrs after the last data point is significantly improved when exchanging the static gravity model from GRIM5-C1 to a modern GRACE-based gravity model EIGEN-CG01C-2 .

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