Development and practice of CHZ-Ⅱ marine gravimeter

doi:10.11947/j.AGCS.2024.20220580

Abstract

Abstract:

Marine gravimeter is an important instrument to obtain high-precision and high-resolution marine gravity field, which is mainly used in resource exploration, geoid refinement, marine science research and gravity assisted inertial navigation. The existing marine gravimeters in China mainly rely on foreign imports, which not only have high prices, but also have many inconveniences in the introduction and maintenance of the instruments. With the support of the major scientific instrument projects of the Ministry of Science and Technology, the CHZ-Ⅱ spring type marine gravimeter with completely independent intellectual property rights has been successfully developed based on the CHZ marine gravimeter. The new gravimeter uses metal zero length spring as the measuring element, and its unique axisymmetric vertical suspension structure can overcome the cross coupling effect. The application of high-precision servo control technology and strong damping can overcome the influence of carrier disturbance and ensure that the instrument maintains measurement accuracy under different sea conditions. High precision constant temperature technology and temperature compensation technology can eliminate the influence of ambient temperature fluctuation on the measuring accuracy of the instrument. This paper introduces the working principle, system structure, features and test results of the instrument. The static test shows that its monthly drift is better than 3 mGal; the wharf mooring test shows that its dynamic accuracy reaches 0.2 mGal, which can clearly reflect the gravity variation characteristics of sea tide; the ship borne test with a total voyage of more than 50 000 nautical miles shows that the comprehensive measurement accuracy is better than 1 mGal. To sum up, the accuracy and stability of the instrument have reached the level of the same kind of instruments at home and abroad, which can replace the current imported marine gravimeter.

Key words: CHZ-Ⅱ marine gravimeter, zero-length spring, silicone oil damping, high-precision constant temperature techno-logy, gyro stabilized platform, marine gravimetry

CLC Number:

P229

Lintao LIU, Jiangang HE, Jiangning XU, Leijun LIU, Jinyao GAO, Zhongmiao SUN, Taiqi WU, Xinghui LIANG, Ming HU, Junjian LANG, Hongyang HE. Development and practice of CHZ-Ⅱ marine gravimeter[J]. Acta Geodaetica et Cartographica Sinica, 2024, 53(4): 620-628.

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载体	测量时间
向阳红10	2015-04-28—2015-05-05
浙嘉渔辅00001	2016-06-25—2016-06-28
邓稼先号	2016-08-22—2016-09-26
科学号	2017-04-02—2017-06-09
南测429	2018-05-05—2018-07-07
向阳红06	2018-05-28—2018-06-25
向阳红10	2018-09-29—2018-11-27
大洋号	2019-08-23—2020-11-02
嘉庚号	2022-04-09—2022-06-03

误差	最大值	最小值	平均值	中误差
平差前	1.31	－1.57	－0.34	0.68
平差后	0.13	－0.12	－0.00	0.07