An internally damped inertial platform for marine gravimetry and a test case in the South China Sea

Pengfei WU; Lin WU; Lifeng BAO; Long WANG; Bo WANG; Danling TANG

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An internally damped inertial platform for marine gravimetry and a test case in the South China Sea

Marine Scientific Instruments | Updated：2024-10-12

- An internally damped inertial platform for marine gravimetry and a test case in the South China Sea
- An internally damped inertial platform for marine gravimetry and a test case in the South China Sea
- 海洋湖沼学报(英文) 2023年41卷第2期页码：816-829
- Affiliations：
  
  1.State Key Laboratory of Geodesy and Earth's Dynamics, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, Wuhan 430077, China
  2.University of Chinese Academy of Sciences, Beijing 100049, China
  3.Guangdong Remote Sensing Center for Marine Ecology and Environment (GDRS), Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), Guangzhou 511458, China
  4.School of Geography and Information Engineering, China University of Geosciences, Wuhan 430074, China
- Author bio：
  
  linwu@apm.ac.cn
  baolifeng@apm.ac.cn
- Funds：
  
  the National Natural Science Foundation of China(42192535;41876136);the Guangdong Special Support Key Team Program(2019BT02H594);The tests in the South China Sea were supported by the Key Special Projects of the Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou) (for Introduced Talents Team)(GML2021GD0810;GML2019ZD0602)
- DOI：
  中图分类号：
- 收稿：2022-10-07，
  
  纸质出版：2023-03-01
- Accepted：
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An internally damped inertial platform for marine gravimetry and a test case in the South China Sea[J]. 海洋湖沼学报(英文), 2023,41(2):816-829.

WU Pengfei,WU Lin,BAO Lifeng,et al.An internally damped inertial platform for marine gravimetry and a test case in the South China Sea[J].Journal of Oceanology and Limnology,2023,41(02):816-829.
An internally damped inertial platform for marine gravimetry and a test case in the South China Sea[J]. 海洋湖沼学报(英文), 2023,41(2):816-829. DOI：

WU Pengfei,WU Lin,BAO Lifeng,et al.An internally damped inertial platform for marine gravimetry and a test case in the South China Sea[J].Journal of Oceanology and Limnology,2023,41(02):816-829. DOI：

摘要

Abstract

To dampen periodic off-levelling motions within an inertial platform while undergoing horizontal accelerations of the same period and to achieve a levelling accuracy of a few tens of arcseconds with that system

an internally damped inertial platform for a marine scalar gravity system was the developed. Methods for attenuating horizontal acceleration and reducing off-levelling error by a satisfactory gyro-levelling loop

which are fundamental to the internally damped inertial platform

were designed and implemented. In addition

phase delays are introduced by the levelling loop. The resulting off-levelling gravity errors were analyzed and modeled. A series of tests on a motion simulator were performed in laboratory for a variety of simulated sea conditions. We found that the motion of the platform is a function of the amplitude and period of the simulated ship motions and ranges between 10 and 40 arcseconds. In addition

the phase lag between platform motion and ship motion is not constant but ranges 180°–270°

depending on the period and amplitude of the motion. Then

the platform

on which a gravimeter was mounted

was installe

d on the R/V

Shiyan

to conduct a gravity survey in the South China Sea. Despite rough sea conditions

it was shown that in short periods of 2–30 s

the off-levelling angle was less than 30 arcseconds

and the phase lagged the horizontal acceleration by 230°–260°. From a repeated survey line and intersecting survey points

the estimated errors of gravity measurements were between 1.3 and 1.7 mGal. The marine measurements results were compared with those of satellite altimetry data and show a mean value of 0.5 mGal in a standard deviation of 1.5 mGal.

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references

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