Author(s)

Delong Tang, Chunhui Li, Peng Lian

Corresponding Author

Delong Tang

ABSTRACT

The electromagnetic environment in the ocean is opposite to that on land. It is an inverted environment. In the ocean, seawater has a high conductivity and covers the relatively high resistivity seabed strata. For quite a long time, marine gravity, marine magnetism, aeromagnetism, marine seismic survey and other methods were mostly used in marine survey and investigation fields, and electromagnetic detection methods were basically not used. In this paper, a set of marine controllable source electromagnetic data processing method is proposed, and the time-frequency and phase characteristics of marine environmental noise are analyzed through time-frequency directional spectrum. Decomposing the marine environmental noise into incoherent isotropic components and coherent anisotropic components can separate the contributions of various sources in the environmental noise to the actual sound field. The method of Fourier transform modulus maxima is used to denoise the electromagnetic signals from marine controllable sources. The obtained figure shows that the method has good denoising effect.

KEYWORDS

Marine electromagnetism; Marine controllable source electromagnetic detection: Time-frequency directional spectrum; Application