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GOCE Gravity Gradients in Instrument and Terrestrial Frames. J. Bouman , Th. Gruber, S . Rispens , E. Schrama , C.C. Tscherning , M.Veicherts , P. Visser. This presentation. Analysis of GOCE gravity gradients Instrument and Earth related frames

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goce gravity gradients in instrument and terrestrial frames

GOCE Gravity Gradients in Instrument and Terrestrial Frames

J. Bouman, Th. Gruber, S. Rispens, E. Schrama, C.C. Tscherning, M.Veicherts, P. Visser

slide2

This presentation

  • Analysis of GOCE gravity gradients
  • Instrument and Earth related frames
  • Data: 31 October 2009 – 11 January 2010
  • First GOCE gravity field solutions use same data period (next three presentations)
gravity gradient preprocessing

Frame trafo

EGG_TRF_2

Temporal corrections

EGG_NOM_2

Outliers, data gaps

External calibration

Gravity Gradient Preprocessing
slide4

EGG_NOM_2 & EGG_TRF_2

  • EGG_NOM_2:
    • Given in instrument frame (GRF)
    • Accurate: VXX, VYY, VZZ, VXZ; less accurate: VXY, VYZ
    • Error increase at long wavelengths
    • Used in gravity field recovery
  • EGG_TRF_2:
    • Given in Local North-Oriented Frame
    • GGs VXY, VYZ: GOCE gravity model
    • Long wavelength GG signal: GOCE gravity model
    • GG error expected to be more homogeneous
slide5

EGG_NOM_2 & EGG_TRF_2

  • EGG_NOM_2:
    • Given in instrument frame (GRF)
    • Accurate: VXX, VYY, VZZ, VXZ; less accurate: VXY, VYZ
    • Error increase at long wavelengths
  • EGG_TRF_2:
    • Given in Local North-Oriented Frame
    • GGs VXY, VYZ: GOCE gravity model
    • Long wavelength GG signal: GOCE gravity model
    • GG error expected to be more homogeneous
slide7

Temporal gravity field variations

VZZtime series, 1 day

SD VZZ, 1 day 

SDs VZZtemporal

corrections, 1 day

external calibration
External calibration
  • Three methods for GG calibration:
  • Global gravity field models
  • GOCE GPS data
  • Terrestrial gravity data
  • GG scale factors 10-2 – 10-3
  • See Poster 014-D3:External Calibration of the GOCE Gravity Gradients at the High-Level Processing Facility (Wednesday)
estimated gg error sds v xx v yy v zz
Estimated GG error SDsVXX, VYY, VZZ
  • GOCE QL gravity model:
  • GGs and GPS tracking
  • Data from November and December 2009
  • SH degree 200
  • Error assessment usingGG residuals

Measurement

Band (MB)

(Pail & Mayrhofer 2010)

  • VXX and VYY same noise level in MB, VZZ 2x larger
  • Noise reduction in upper MB is “work in progress” (see Fehringeret al, Floberghagen, this morning)
slide10

EGG_NOM_2 & EGG_TRF_2

  • EGG_NOM_2:
    • Given in instrument frame (GRF)
    • Accurate: VXX, VYY, VZZ, VXZ; less accurate: VXY, VYZ
    • Error increase at long wavelengths
  • EGG_TRF_2:
    • Given in Local North-Oriented Frame
    • GGs VXY, VYZ: GOCE QL gravity field model
    • Long wavelength GG signal: GOCE gravity model
    • GG error expected to be more homogeneous
egg trf 2 v xx
EGG_TRF_2: VXX

GOCE - EIGEN5C (N=360) Binned averages31 October 2009 - 11 January 2010

Color scale: -15 mE to +15 mE

GOCE - EGM2008 (N=360)Binned averages 31 October 2009 - 11 January 2010

egg trf 2 v yy
EGG_TRF_2: VYY

GOCE - EIGEN5C (N=360) Binned averages31 October 2009 - 11 January 2010

Color scale: -15 mE to +15 mE

GOCE - EGM2008 (N=360)Binned averages 31 October 2009 - 11 January 2010

egg trf 2 v zz
EGG_TRF_2: VZZ

GOCE - EIGEN5C (N=360) Binned averages31 October 2009 - 11 January 2010

Color scale: -15 mE to +15 mE

GOCE - EGM2008 (N=360)Binned averages 31 October 2009 - 11 January 2010

summary
GOCE gravity gradients in GRF and LNOF (EGG_NOM_2 & EGG_TRF_2)

November 2009 – January 2010 timeframe

Differences with EIGEN5C & EGM2008(Africa, Himalaya, …)

Error level VZZ about 2x that of VXX, VYY in MB

Spurious tracks VYY close to magnetic poles:

Not well understood

Very likely related to interaction between attitude control and magnetic field

Seems to diminish after in-flight calibration 11/12 January 2010

Overall, GG data look very good

Summary