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Some remarks about drift and jumps of relative gravimeters Michel SARRAILH, BGI

Some remarks about drift and jumps of relative gravimeters Michel SARRAILH, BGI. (a) The profile method (double occupation). 1 2 3 4 5 1 2 3 4. (b) The step method (triple occupation). 2 3 2 3 4

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Some remarks about drift and jumps of relative gravimeters Michel SARRAILH, BGI

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  1. Some remarks about drift and jumps of relative gravimeters Michel SARRAILH, BGI Microgravimetric Summer School, Lanzarote, 2005

  2. (a) The profile method (double occupation) 1 2 3 4 5 1 2 3 4 (b) The step method (triple occupation) • 2 3 • 2 3 4 • 3 4 5 Microgravimetric Summer School, Lanzarote, 2005

  3. (a) Drift 0.1/0.5 time unit +jump 0.2 Microgravimetric Summer School, Lanzarote, 2005

  4. (b) Drift 0.1/0.5 time unit +jump 0.2 Microgravimetric Summer School, Lanzarote, 2005

  5. USB data acquisition card (8 bits 0-256) Altera microprocessor memories batteries rheostats Cable from the voltmeter output Microgravimetric Summer School, Lanzarote, 2005

  6. USB data acquisition card (8 bits 0-256) Time (seconds) Microgravimetric Summer School, Lanzarote, 2005

  7. Voltmeter output : Effects of clamping & unclamping Clamp/unclamp Clamp Unclamp Microgravimetric Summer School, Lanzarote, 2005

  8. Voltmeter output : +/- 0.2 rotation Microgravimetric Summer School, Lanzarote, 2005

  9. Existing packages : Gravap : T.Schüler (IfEN) CG3tool : IRD (Gabalda & Bonvallot) Gravtool Gravity preprocessing software Microgravimetric Summer School, Lanzarote, 2005

  10. A freeware project - Java (multiplatform) - Graphic interfaces • Preprocessing : • Earth tides station parameters : • converted from Wparex (Wenzel) • Earth tides corrections (GR31 – 505 waves, no ocean loading) • Mean value determination • Drift correction (linear or parabolic hypothesis) • Jump detection Microgravimetric Summer School, Lanzarote, 2005

  11. Least square adjustment Free or constrained adjustment Cholesky, SVD, Tikhonov Outlier detection Network adjustement Microgravimetric Summer School, Lanzarote, 2005

  12. GravPrep Microgravimetric Summer School, Lanzarote, 2005

  13. GravPrep Microgravimetric Summer School, Lanzarote, 2005

  14. GravPrep Microgravimetric Summer School, Lanzarote, 2005

  15. Microgravimetric Summer School, Lanzarote, 2005

  16. Microgravimetric Summer School, Lanzarote, 2005

  17. Drift correction Microgravimetric Summer School, Lanzarote, 2005

  18. Network adjustment Microgravimetric Summer School, Lanzarote, 2005

  19. Network adjustment Microgravimetric Summer School, Lanzarote, 2005

  20. Network adjustment Microgravimetric Summer School, Lanzarote, 2005

  21. Validation package Microgravimetric Summer School, Lanzarote, 2005

  22. Validation package Microgravimetric Summer School, Lanzarote, 2005

  23. Interpret 2.5 bodies Microgravimetric Summer School, Lanzarote, 2005

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