Magnetotelluric sounding signal reconstruction method and magnetotelluric sounding signal reconstruction system

Abstract

The invention relates to a magnetotelluric sounding signal reconstruction method and system. The method comprises the following steps of acquiring an initial magnetotelluric sounding signal; performing complementary ensemble empirical mode decomposition on the initial magnetotelluric sounding signal to obtain a plurality of mode component sequences; performing Hilbert transform on the plurality ofmodal component sequences to obtain an instantaneous frequency spectrum of each modal component sequence; screening a modal component sequence corresponding to the instantaneous frequency spectrum according to the distribution condition of the frequency points of the instantaneous frequency spectrum; and reconstructing all the reserved modal component sequences to obtain a reconstructed magnetotelluric sounding signal. The magnetotelluric sounding signal reconstruction method and system provided by the present invention solves a problem that a good denoising effect cannot be achieved for themagnetotelluric sounding signal of a dead band in the prior art.

Description

technical field [0001] The invention relates to the field of signal processing, in particular to a reconstruction method and system for magnetotelluric sounding signals. Background technique [0002] Magnetotelluric sounding (MT for short) uses a natural alternating electromagnetic field as a field source. Among them, the natural magnetotelluric field signal in the 0.1Hz-10Hz frequency band is weak, and the magnetotelluric sounding data measured in this frequency band are easily interfered by various electromagnetic noises, so this frequency band is called the "dead frequency band" of the magnetotelluric sounding method. With the advancement of deep resource exploration and mining projects, the magnetotelluric sounding method is required to have higher data quality, but the magnetotelluric sounding measurement in ore-concentrated areas is increasingly affected by mining, power grid transmission, signal towers, etc. The impact of this often makes the already weak "dead frequ...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a method and system for reconstructing magnetotelluric sounding signals to solve the problem in the prior art that a good denoising effect cannot be achieved for magnetotelluric sounding signals in the "dead frequency band"

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