Error Correction Model and Uncertainty Analysis of the Shipborne Absolute Gravity Measurement System

WU Yanxiong; TENG Yuntian; WU Qiong; XU Xing; ZHANG Bing

doi:10.13203/j.whugis20190412

Volume 47 Issue 4

Apr. 2022

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Geomatics and Information Science of Wuhan University > 2022 > 47(4): 492-500. > DOI: 10.13203/j.whugis20190412

WU Yanxiong, TENG Yuntian, WU Qiong, XU Xing, ZHANG Bing. Error Correction Model and Uncertainty Analysis of the Shipborne Absolute Gravity Measurement System[J]. Geomatics and Information Science of Wuhan University, 2022, 47(4): 492-500. DOI: 10.13203/j.whugis20190412

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Error Correction Model and Uncertainty Analysis of the Shipborne Absolute Gravity Measurement System

WU Yanxiong^{1, 2,},
TENG Yuntian¹,
WU Qiong^1, ,,
XU Xing³,
ZHANG Bing⁴

1.
Institute of Geophysics, China Earthquake Administration, Beijing 100081, China
2.
School of Electronic Science and Control Engineering, Institute of Disaster Prevention, Sanhe 065201, China
3.
Guangzhou Marine Geological Survey, China Geology Survey, Guangzhou 510760, China
4.
Institute of Earthquake Forecasting, China Earthquake Administration, Beijing 100036, China

Funds:

The National Key Research and Development Program of China 2018YFC1503801

Special Support for Basic Scientific Research Business Expenses of the Institute of Geophysics, China Earthquake Administration DQJB19B23

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Author Bio:
WU Yanxiong, PhD candidate, associate professor, specializes in earth exploration technology. E⁃mail: wuyanxiong@cidp.edu.cn
Corresponding author:
WU Qiong, PhD, professor. E-mail: wuqiong@cea-ipg.ac.cn
Received Date: June 10, 2020
Published Date: April 04, 2022

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Abstract

Abstract

Objectives The laser interference absolute gravimeters can only work in static conditions until now, and absolute gravity measurement in a dynamic environment is one of the hotspots for future technological development. The shipboard absolute gravity measurement can overcome the problems of zero drift, calibration, and error accumulation of the marine relative gravity instruments, and improve their efficiency and reliability.
Methods We present an absolute gravity measurement system from a ship, which consisted of an absolute gravity instrument, a gyro-stabilized platform, a force balance accelerometer and GPS (global positioning system).Firstly, Four types of interference sources that the vertical fluctuation, the pitch and roll, the horizontal fluctuation and the Eötvös effect, which cause the measurement errors of the shipboard gravity measurement system, were analyzed. Then, the limits of dynamic measurement, the error correction methods and their accuracy were given.
Results and Conclusions Under current technical conditions, the precision of the shipboard absolute gravimeter measurement system can be better than ±1.1 mGal. Therefore it provides theoretical support for further shipborne absolute gravity measurement experiments.
- absolute gravity,
- marine gravity,
- shipborne,
- laser interference,
- error correction,
- uncertainty analysis

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References (28)

References

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