海上拖曳式地磁矢量测量系统研制及海试

doi:10.11720/wtyht.2024.0155

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Abstract

The geomagnetic field is a vector field in space. However, traditional marine magnetic surveys focus on geomagnetic field intensity, failing to fully acquire and utilize rich information about the geomagnetic vector field. Given this, this study developed a towed marine geomagnetic vector measurement system. This system was designed to operate in dynamic marine conditions and ultimately acquire geomagnetic vector field data within the geographical coordinate system. Through sea trials of the system, grid line and repeat line measurements were obtained. After preprocessing the collected data, the measurement accuracy of repeat lines and crosspoints was better than 6.7 nT and 6 nT, respectively. The results of the sea test indicate that the measurement system has the preliminary ability to measure the geomagnetic vector field at sea, and it can be applied to geomagnetic field measurement tasks near or far sea, obtaining richer geomagnetic field information.

Key words： marine magnetic survey vector field Fluxgate sensor measurement system sea trial

Received: 07 April 2024 Published: 08 January 2025

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	Articles by authors
	Jian-Gang LUO
	Hai-Hu LI
	Jing-Xiao LIU
	Hai-Bing LI
	Zi-Wei GUO
	Ning SUN
	Bi-Bo FU
	Feng ZHANG
	Xue-Yan LI

Cite this article:

Jian-Gang LUO,Hai-Hu LI,Jing-Xiao LIU, et al. Development and sea trials of a marine towed geomagnetic vector measurement system[J]. Geophysical and Geochemical Exploration, 2024, 48(6): 1455-1462.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2024.0155 OR https://www.wutanyuhuatan.com/EN/Y2024/V48/I6/1455

Coordinate system diagram of geomagnetic vector measurement system

Schematic diagram of electrical connection of the measurement system

Schematic diagram of the measurement system

Process of sea measurement test

Attitude angle curve during measurement

Relative position diagram of survey line

Magnetic compensation sailing path

Comparison of magnetic field curves before and after magnetic compensation
a—eastward component; b—northbound component; c—vertical component; d—total magnetic field

Standard deviation and improvement rate before and after magnetic compensation

Trace of repeating line

Repeated line magnetic field curve
a—eastward component; b—northbound component; c—vertical component; d—total magnetic field

Accuracy of coincidence within repeated lines

Crosspoint inconsistency
a—eastward component; b—northbound component; c—vertical component; d—total magnetic field

Accuracy of conformity within the crossing points

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