A Dynamic Measurement Method of Gravity Gradient Based on Torsion Balance
YE Ziwei1,WANG Fei2,BAO Fu2,HUANG Anyi1,YU Ye3,HU Hongbo2,WANG Ruolin1
1. School of Mechanical and Electronic Engineering,Wuhan University of Technology,Wuhan,Hubei 430070,China
2. Hubei Institute of Measurement and Testing Technology,Wuhan,Hubei 430223,China
3. Wuhan Optics Valley Aerospace Sanjiang Laser Industry Technology Research Institute Co. Ltd,Wuhan,Hubei 430073,China
Abstract：To study the problem that the traditional torsion balance gravity gradiometer has high accuracy but poor stability and low measurement efficiency,introducing the dynamic modulation method and applying the Z-type torsion balance structure to the dynamic measurement mode to realize the simultaneous measurement of gravity horizontal gradient and gravity curvature. Using rotating filter and genetic algorithm in the process of signal processing can effectively eliminate the influence of free oscillation of torsion pendulum on target peak value and extract the amplitude and phase of target frequency. The simulation results show that the uncertainty component introduced by the genetic algorithm to extract the target gravity gradient value from the dynamic measurement mode signal does not exceed 0.0077E(1E=10-9/s2). When genetic algorithm is used for data post-processing,the measurement uncertainty of the system is evaluated as 0.0582E.
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2024, Vol. 45 
