Preprints
https://doi.org/10.5194/gi-2020-33
https://doi.org/10.5194/gi-2020-33

  27 Nov 2020

27 Nov 2020

Review status: a revised version of this preprint is currently under review for the journal GI.

Vibration error compensation algorithm in the development of the laser interference absolute gravimeter

Qiong Wu1, Yuntian Teng1, Xiaomei Wang1, Yanxiong Wu1,2, and Yang Zhang1 Qiong Wu et al.
  • 1Institute of Geophysics, China Earthquake Administration, Beijing, 100081, China
  • 2Institute of Disaster Prevention, Sanhe, 065201, China

Abstract. Measurement error arising from vibration interference is recognized as the primary obstacle limiting the accuracy and stability of laser interference absolute gravimeters. The present work addresses this issue by proposing a global search optimization algorithm that determines the optimal absolute value of gravity based on the measured time-displacement coordinates of a falling body and the signal obtained from the passive vibration isolation system of the inertial reference corner-cube in a laser interference absolute gravimeter. Results of numerical calculations conducted under vibration interference conditions with added white noise resulting in a signal-to-noise ratio of 40 dB demonstrate the following. (1) The accuracy and standard deviation of the gravimeter obtained using the proposed algorithm are −0.04 μGal (1 μGal = 1 × 10−8 m/s2) and 0.24 μGal, respectively, while those values obtained by the standard least-squares solution are 10.19 μGal and 154.11 μGal, respectively. (2) The resolution of the test results shows that the average response of the reference value of acceleration due to gravity superimposed by a disturbance of 1.00 μGal is 1.01 μGal using the proposed algorithm and 0.87 μGal using the standard least-squares solution.

Qiong Wu et al.

 
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Status: final response (author comments only)
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Qiong Wu et al.

Qiong Wu et al.

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Short summary
Laser interference absolute gravimeters are high-precision gravimetry instruments. However, The error caused by self-sysetm and enviromental vibration has become the primary obstacle limiting its accuracy and stability. The present work addresses this issue by proposing a global search optimization algorithm that determines the optimal absolute value of gravity. The results evaluated by numerical calculations demonstrate that this algorithm provides a substantial anti-vibration capability.