Exploring the possibilities for star-tracker assisted calibration of the six individual GOCE accelerometers |
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Authors: | P N A M Visser |
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Institution: | (1) Delft Institute of Earth Observation and Space Systems (DEOS), Delft University of Technology, Kluyverweg 1, 2629 HS Delft, The Netherlands |
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Abstract: | A method has been developed and tested for estimating calibration parameters for the six accelerometers on board the Gravity
field and steady-state Ocean Circulation Explorer (GOCE) from star tracker observations. These six accelerometers are part
of the gradiometer, which is the prime instrument on board GOCE. It will be shown that by taking appropriate combinations
of observations collected by the accelerometers, by modeling acceleration terms caused by gravity gradients from an a priori
low-degree spherical harmonic expansion, and by modeling rotational acceleration terms derived from star-tracker observations,
scale factors of each of the accelerometers can be estimated for each axis. Simulated observations from a so-called end-to-end
simulator were used to test the method. This end-to-end simulator includes a detailed model of the GOCE satellite, its instruments
and instrument errors, and its environment. Results of the tests indicate that scale factors of all six accelerometers can
be determined with an accuracy of around 0.01 for all components on a daily basis. |
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Keywords: | GOCE Gradiometer Accelerometers Star-tracker Calibration Bias Bias drift Scale factor |
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