gravimetry; Zero-crossing; signal processing; absolute gravimeter
Abstract :
[en] This paper reports results of comparison of three digital fringe signal processing methods implemented in the same free-fall absolute gravimeter. A two-sample zero-crossing method, a windowed second-difference method and a method of non-linear least-squares adjustment on the undersampled fringe signal are compared in numerical simulations, hardware tests and actual measurements with the MPG-2 absolute gravimeter, developed at the Max Planck Institute for the Science of Light, Germany. The two-sample zero-crossing method realizes data location schemes that are both equally spaced in distance and equally spaced in time (EST) along the free-fall trajectory. The windowed second-difference method and the method of non-linear least-squares adjustment with complex heterodyne demodulation operate with the EST data. Results of the comparison verify an agreement of the three methods within one part in 10 9 of the measured gravity value, provided a common data location scheme is considered.
Disciplines :
Earth sciences & physical geography Physics
Author, co-author :
Svitlov, S.; Max Planck Research Group, Institute of Optics, Information and Photonics, University of Erlangen-Nuremberg
Masłyk, P.; Max Planck Research Group, Institute of Optics, Information and Photonics, University of Erlangen-Nuremberg
ROTHLEITNER, Christian ; University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Engineering Research Unit
Hu, H.; Max Planck Research Group, Institute of Optics, Information and Photonics, University of Erlangen-Nuremberg
Wang, LJ; Max Planck Research Group, Institute of Optics, Information and Photonics, University of Erlangen-Nuremberg
Language :
English
Title :
Comparison of three digital fringe signal processing methods in a ballistic free-fall absolute gravimeter
