Alternative method for angular rate determination within the GOCE gradiometer processing |
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Authors: | C Stummer T Fecher R Pail |
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Institution: | 1.Institut für Astronomische und Physikalische Geod?sie (IAPG), Technische Universit?t München,Munich,Germany |
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Abstract: | The most crucial part of the GOCE gradiometer processing is, besides the internal calibration of the gradiometer, the determination
of the satellite’s inertial angular rate. This paper describes a new method for the angular rate determination. It is based
on the stochastic properties of the GOCE star sensors and the gradiometer. The attitude information of both instrument types
is combined at the level of angular rates. The combination is done in the spectral domain by Wiener filtering, and thus using
an optimal relative weighting of the star sensor and gradiometer attitude information. Since the complete processing chain
from raw measurements to gravity field solutions is performed, the results are not only analyzed at the level of gravity gradients,
but also of gravity field solutions. Compared to the nominal method, already the resulting gravity gradients show a significantly
improved performance for the frequencies (mainly) below the gradiometer measurement bandwidth. This can be verified by analysis
of the gravity gradient trace. The improvement is propagated to the level of gravity field models, where a better accuracy
can be observed for selected groups of coefficients at characteristic bands at orders k × 16, with integer k, up to high harmonic degrees. |
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