The GOCE-only global gravity field model IfE_GOCE05s
Cite as:
Wu, Hu; Müller, Jürgen; Brieden, Phillip (2017): The GOCE-only global gravity field model IfE_GOCE05s. GFZ Data Services. https://doi.org/10.5880/icgem.2017.006
Status
I N R E V I E W : Wu, Hu; Müller, Jürgen; Brieden, Phillip (2017): The GOCE-only global gravity field model IfE_GOCE05s. GFZ Data Services. https://doi.org/10.5880/icgem.2017.006
Abstract
IfE_GOCE05s is a GOCE-only global gravity field model, which was developed at the Institut für Erdmessung (IfE), Leibniz Universität Hannover, Germany. The observations with a time span from 1 November 2009 to 20 October 2013 are used for the model recovery. The GOCE precise kinematic orbit with 1-s sampling rate is processed for the gravity field up to degree/order 150, while the three main diagonal gravity gradients are down-sampled to 2 s and used to recover the model up to degree/order 250. With two additional Kaula’s regularizations, the combined model “IfE_GOCE05s” is derived, with a maximum degree of 250.
To develop IfE_GOCE05s, the following GOCE data (01.11.2009 - 20.10.2013) was used:
* Orbits: SST_PKI_2, SST_IAQ_2;
* Gradients: EGG_GGT_2, EGG_IAQ_2.
None any priori gravity field information was used.
Processing procedures:
Gravity from orbits (SST):
* Acceleration approach was applied to the kinematic orbit data;
* PKI data was at 1 s sampling rate;
* Model was derived up to d/o (degree/order) 150;
* VCM (Variance-Covariance Matrix) was derived arc-wisely from the post-fit residuals.
Gravity from gradients (SGG):
* Gradients Vxx, Vyy and Vzz in the GRF (Gradiometer Reference Frame) were used;
* Gradients were down-sampled to 2 s;
* Model was derived up to d/o 250;
* VCM was estimated arc-wisely from the post-fit residuals.
Regularization:
* A strong Kaula-regularization was applied to constrain the (near-)zonal coefficients that are degraded by the polar gap problem;
* A slight Kaula-regularization was applied to improve the signal-to-noise ratio of the coefficients between d/o 201 and 250;
* The regularization parameters were empirically determined.
Combined solution:
* The normal equations for SST and SGG were summed wih proper weighting factors;
* Weighting factors for SST and SGG were determined from variance component estimation;
* A direct inversion was applied on the final normal equation.
Authors
Wu, Hu;Institut für Erdmessung (IfE), Leibniz Universität Hannover, Germany
Müller, Jürgen;Institut für Erdmessung (IfE), Leibniz Universität Hannover
Brieden, Phillip;Institut für Erdmessung (IfE), Leibniz Universität Hannover
Contact
Wu, Hu
(Postdoc Resarcher); Institut für Erdmessung (IfE), Leibniz Universität Hannover;
CharacterString: IfE_GOCE05s is a GOCE-only global gravity field model, which was developed at the Institut für Erdmessung (IfE), Leibniz Universität Hannover, Germany. The observations with a time span from 1 November 2009 to 20 October 2013 are used for the model recovery. The GOCE precise kinematic orbit with 1-s sampling rate is processed for the gravity field up to degree/order 150, while the three main diagonal gravity gradients are down-sampled to 2 s and used to recover the model up to degree/order 250. With two additional Kaula’s regularizations, the combined model “IfE_GOCE05s” is derived, with a maximum degree of 250.
To develop IfE_GOCE05s, the following GOCE data (01.11.2009 - 20.10.2013) was used:
* Orbits: SST_PKI_2, SST_IAQ_2;
* Gradients: EGG_GGT_2, EGG_IAQ_2.
None any priori gravity field information was used.
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