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On the determination of vertical gravity gradients by corner-cube absolute gravimeters

Source: Metrologie : 56. (5), 9 s. ISSN: 0026-1394

Publication type: článek v odborném periodiku
ExtentPálinkáš, Vojtěch9 stran

This paper describes a new approach for the determination of vertical gravity gradients (VGGs) from the measurements of corner-cube absolute gravimeters based on laser interferometry. The new approach has been obtained by the modification of the equation for linear least squares solution used in the determination of the g-values. It enables one to establish a clear mathematical relation between the gravity residuals and the VGG estimates. As it is shown, in the determination of gradients with an accuracy approaching 10 µGal/m (1 µGal = 1E-8 m/s^2), it is necessary to correct directly the measured quantities (time and distance pairs) for "known", or sufficiently well modelled, perturbations as e.g. self-attraction or cable effects. Generally, if the gradients are determined from the data of absolute gravimeters, systematic low frequency perturbation in the residuals have to be analysed carefully. In this way, hidden perturbations in the residuals can be identified, which might be important also for the correct estimation of the g values and associated uncertainties. This is shown on the example of a parasitic wave detected in the residuals of the FG5X-251 gravimeter, reaching a period of about 0.13 m and amplitudes up to 40 pm. Finally, we compare the gravity gradients determined by the new approach with a more accurate method using relative gravimeters. This comparison shows that the gradient estimates from the FG5X-251 absolute gravimeter are biased by about 10 µGal/m and reach reproducibility of 14 µGal/m. The effort to determine VGGs from absolute gravimeters enhanced the analyses of the measured data, identified still existing artefacts in the gravity residuals, the explanation of which should lead to improvements in the measurement model in order to obtain more accurate estimates of the g-values, VGGs and their uncertainties.

Citation: PÁLINKÁŠ, Vojtech a Miloš VAĽKO. On the determination of vertical gravity gradients by corner-cube absolute gravimeters. Metrologia. Spojené království Velké Británie a Severního Irska, 2019, 56(1), 9.DOI:10.1088/1681-7575/ab32fb. ISSN 0026-1394. Dostupné z:

The record appears in these collections:
Focus on VÚGTK > VÚGTK Departments > Geodesy and Geodynamics
Focus on VÚGTK > Researchers > Vojtěch Pálinkáš
Documents of VÚGTK > Articles VÚGTK
Focus on VÚGTK > RIV

 Record created 2020-09-08, last modified 2020-12-07

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