000196056 001__ 196056
000196056 003__ CZ-ZdVUG
000196056 005__ 20201207113218.0
000196056 041__ $$aeng
000196056 040__ $$aABC039$$bcze
000196056 1001_ $$apříjmení,jm.
000196056 24510 $$aOn the determination of vertical gravity gradients by corner-cube absolute gravimeters
000196056 300__ $$aPálinkáš, Vojtěch
000196056 300__ $$a9 stran
000196056 5203_ $$aThis 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.
000196056 655_4 $$ačlánek v odborném periodiku
000196056 7730_ $$92019$$dSpojené království Velké Británie a Severního Irska, 2019.$$g56. (5), 9 s.$$tMetrologie$$x0026-1394
000196056 8564_ $$uhttps://iopscience.iop.org/article/10.1088/1681-7575/ab32fb
000196056 85642 $$ahttps://www.rvvi.cz/riv?s=rozsirene-vyhledavani&ss=detail&n=0&h=RIV%2F00025615%3A_____%2F19%3AN0000046%21RIV20-MSM-00025615
000196056 910__ $$aABC039
000196056 980__ $$aclanky_vugtk
000196056 985__ $$apalinkas
000196056 985__ $$ariv
000196056 985__ $$autvar24