Effect of Ship's Motion on Wave-Generated Magnetic Field in Marine Magnetic Survey

Abstract:

The survey ship would be interfered by wave-generated magnetic field in marine survey. The waves magnetic field is difficult to eliminate because it is the signal in low frequency like ships magnetization field. When survey ship sails, the frequency of waves magnetic field would change. It was found that the frequency has a linear relationship with ships speed and varies in sine or cosine with the angle between ships and waves directions. Ocean waves PSD would be compressed and strong noise of low frequency in narrowband turns up when ship sails in the same direction of waves. The frequency band of PSD would be broadened and small interference occurs while ships direction is opposite. A conclusion can be drawn that survey ship should sail reversely with ocean waves in marine magnetic survey, so the magnetic field induced by ocean waves would extend to high frequency and it is better for noise elimination.

• Periodical: Applied Mechanics and Materials (Volumes 380-384)
• Pages: 228-231
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.380-384.228
• Online since: August 2013
• Authors: Xing Le Zhu, Chang Han Xiao, Zhen Ning Yao
• Keywords: Marine Magnetic Survey, Noise Elimination, PSD, Wave-Generated Magnetic Field

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