Calibration of a superconducting gravimeter with an absolute atom gravimeter

We present a 27-day-long common view measurement of an absolute cold atom gravimeter (CAG) and a relative iGrav superconducting gravimeter, which we use to calibrate the iGrav scale factor. This allowed us to push the CAG long-term stability down to the level of 0.5 nm s - 2 . We investigate the imp...

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Veröffentlicht in:	J.Geod 2021-05, Vol.95 (5), Article 62
Hauptverfasser:	Merlet, Sébastien, Gillot, Pierre, Cheng, Bing, Karcher, Romain, Imanaliev, Almazbek, Timmen, Ludger, Pereira dos Santos, Franck
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Schlagworte:	Calibration Colour Earth and Environmental Science Earth Sciences Geochemistry & Geophysics Geodetics Geophysics Geophysics/Geodesy Instrumentation and Detectors Measurement Original Article Physical Sciences Physics Remote Sensing Science & Technology Stability Technology Tidal amplitude
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creator	Merlet, Sébastien Gillot, Pierre Cheng, Bing Karcher, Romain Imanaliev, Almazbek Timmen, Ludger Pereira dos Santos, Franck
description	We present a 27-day-long common view measurement of an absolute cold atom gravimeter (CAG) and a relative iGrav superconducting gravimeter, which we use to calibrate the iGrav scale factor. This allowed us to push the CAG long-term stability down to the level of 0.5 nm s - 2 . We investigate the impact of the duration of the measurement on the uncertainty in the determination of the correlation factor and show that it is limited to about 3‰ by the coloured noise of our cold atom gravimeter. A 3-day-long measurement session with an additional FG5X absolute gravimeter allows us to directly compare the calibration results obtained with two different absolute meters. Based on our analysis, we expect that with an improvement of its long-term stability, the CAG will allow to calibrate the iGrav scale factor to better than the per mille level (1 σ level of confidence) after only 1 day of concurrent measurements for maximum tidal amplitudes.
doi_str_mv	10.1007/s00190-021-01516-6
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subjects	Calibration Colour Earth and Environmental Science Earth Sciences Geochemistry & Geophysics Geodetics Geophysics Geophysics/Geodesy Instrumentation and Detectors Measurement Original Article Physical Sciences Physics Remote Sensing Science & Technology Stability Technology Tidal amplitude
title	Calibration of a superconducting gravimeter with an absolute atom gravimeter
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