NDLI: Optimized strategy for the calibration of superconducting gravimeters at the one per mille level

Content Provider	Springer Nature Link
Author	Camp, Michel Meurers, Bru Viron, Olivier Forbriger, Thomas
Copyright Year	2015
Abstract	This paper reports on different sources of errors that occur in the calibration process of a superconducting gravimeter (SG), determined by comparison with a ballistic absolute gravimeter (AG); some of them have never been discussed in the literature. We then provide methods to mitigate the impact of those errors, to achieve a robust calibration estimate at the level. We demonstrate that a standard deviation at the level of can be reached within 48 h by measuring at spring tides and by increasing the AG sampling rate. This is much shorter than what is classically reported in previous empirical studies. Measuring more than 5 days around a tidal extreme does not improve the precision in the calibration factor significantly, as the variation in the error as a function of $$1/\sqrt{N} $$ does not apply, considering the decrease in signal amplitude due to the tidal modulation. However, we investigate the precision improvement up to 120 days, which can be useful if an AG is run continuously: at mid-latitude it would require 21 days to ensure a calibration factor at the level with a 99.7 % confidence interval. We also show that restricting the AG measurement periods to tidal extrema can reduce instrument demand, while this does not affect the precision on the calibration factor significantly. Then, we quantify the effect of high microseismic noise causing aliasing in the AG time series. We eventually discuss the attenuation bias that might be induced by noisy time series of the SG. When experiments are performed at the level, 7 are needed to ensure that the error in the calibration estimate will be at the 1 per mille level with a 99 % confidence.
Starting Page	91
Ending Page	99
Page Count	9
File Format	PDF
ISSN	09497714
Journal	Journal of Geodesy
Volume Number	90
Issue Number	1
e-ISSN	14321394
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2015-09-25
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Calibration Superconducting gravimeter Absolute gravimeter Earth tide Geophysics/Geodesy Earth Sciences
Content Type	Text
Resource Type	Article
Subject	Geophysics Geochemistry and Petrology Computers in Earth Sciences

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