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Journal of Geodesy

, Volume 83, Issue 7, pp 659–678 | Cite as

Preprocessing of gravity gradients at the GOCE high-level processing facility

  • Johannes BoumanEmail author
  • Sietse Rispens
  • Thomas Gruber
  • Radboud Koop
  • Ernst Schrama
  • Pieter Visser
  • Carl Christian Tscherning
  • Martin Veicherts
Open Access
Original Article

Abstract

One of the products derived from the gravity field and steady-state ocean circulation explorer (GOCE) observations are the gravity gradients. These gravity gradients are provided in the gradiometer reference frame (GRF) and are calibrated in-flight using satellite shaking and star sensor data. To use these gravity gradients for application in Earth scienes and gravity field analysis, additional preprocessing needs to be done, including corrections for temporal gravity field signals to isolate the static gravity field part, screening for outliers, calibration by comparison with existing external gravity field information and error assessment. The temporal gravity gradient corrections consist of tidal and nontidal corrections. These are all generally below the gravity gradient error level, which is predicted to show a 1/f behaviour for low frequencies. In the outlier detection, the 1/f error is compensated for by subtracting a local median from the data, while the data error is assessed using the median absolute deviation. The local median acts as a high-pass filter and it is robust as is the median absolute deviation. Three different methods have been implemented for the calibration of the gravity gradients. All three methods use a high-pass filter to compensate for the 1/f gravity gradient error. The baseline method uses state-of-the-art global gravity field models and the most accurate results are obtained if star sensor misalignments are estimated along with the calibration parameters. A second calibration method uses GOCE GPS data to estimate a low-degree gravity field model as well as gravity gradient scale factors. Both methods allow to estimate gravity gradient scale factors down to the 10−3 level. The third calibration method uses high accurate terrestrial gravity data in selected regions to validate the gravity gradient scale factors, focussing on the measurement band. Gravity gradient scale factors may be estimated down to the 10−2 level with this method.

Keywords

GOCE High-level processing facility Gravity gradients Preprocessing Calibration 

Notes

Acknowledgments

This study was performed in the framework of the European Space Agency project (No. 18308/04/NL/MM): GOCE High-level Processing Facility.

Open Access

This article is distributed under the terms of the Creative Commons Attribution Noncommercial License which permits any noncommercial use, distribution, and reproduction in any medium, provided the original author(s) and source are credited.

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Copyright information

© The Author(s) 2008

Authors and Affiliations

  • Johannes Bouman
    • 1
    • 2
    • 3
    Email author
  • Sietse Rispens
    • 1
  • Thomas Gruber
    • 4
  • Radboud Koop
    • 5
  • Ernst Schrama
    • 2
  • Pieter Visser
    • 2
  • Carl Christian Tscherning
    • 6
  • Martin Veicherts
    • 6
  1. 1.SRON Netherlands Institute for Space ResearchUtrechtThe Netherlands
  2. 2.Delft Institute of Earth Observation and Space Systems (DEOS)Faculty of Aerospace Engineering, Delft University of TechnologyDelftThe Netherlands
  3. 3.Deutsches Geodätisches Forschungsinstitut (DGFI)MunichGermany
  4. 4.Institut für Astronomische und Physikalische Geodäsie (IAPG)Technische Universität MünchenMunichGermany
  5. 5.DelftThe Netherlands
  6. 6.Niels Bohr InstituteUniversity of CopenhagenCopenhagenDenmark

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