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Rotary table wobble error analysis and correction of a rotating accelerometer gravity gradiometer.

P Chen1, M Yu1, Z Deng1

  • 1MOE Key Laboratory of Fundamental Physical Quantities Measurement & Hubei Key Laboratory of Gravitation and Quantum Physics, PGMF and School of Physics, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China.

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Summary
This summary is machine-generated.

Rotary table wobble in rotating accelerometer gravity gradiometers (RAGG) causes significant errors. This study analyzes wobble

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Area of Science:

  • Geophysics
  • Instrument Science
  • Gravimetry

Background:

  • Rotating accelerometer gravity gradiometers (RAGG) are susceptible to errors.
  • Rotary table wobble, a shift in the spin axis, is a known source of RAGG error, but its mechanism and impact are not fully understood.
  • Understanding wobble-induced errors is crucial for improving RAGG precision.

Purpose of the Study:

  • To analyze the relationship between rotary table wobble and RAGG output errors.
  • To elucidate the error transmission mechanism from wobble to specific force measurements.
  • To propose and validate a post-error correction method for wobble-induced RAGG errors.

Main Methods:

  • Analysis of the influence of wobble-induced attitude changes, angular velocity, and angular acceleration on specific force.
  • Description of error transmission based on accelerometer configuration and measurement principles.
  • Simulated experiments to quantify wobble-induced errors and validate the proposed correction method.

Main Results:

  • Angular velocity noise of 1 μrad/s from wobble can cause errors of tens of E (error units).
  • A post-error correction method based on a high-precision RAGG model and motion measurement was proposed.
  • The proposed method reduced RAGG channel errors to 3.69 E and 1.85 E.

Conclusions:

  • Rotary table wobble significantly impacts RAGG performance.
  • The proposed error analysis and correction method effectively mitigate wobble-induced errors.
  • This work is vital for the development of high-precision gravity gradiometers.