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

• DOI: 10.1007/s00190-008-0279-9
• Publication Date: 2008-10-29T07:52:42Z
• Authors: Johannes Bouman; Sietse Rispens; Thomas Gruber; Radboud Koop; Ernst Schrama; Pieter Visser; Carl Christian Ts...; Martin Veicherts
• Keywords: Free-air gravity anomaly

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