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Method and system for noise suppression of aeromagnetic gradient tensor data based on hybrid norm fitting

A gradient tensor and magnetic gradient technology, applied in the field of geophysical aeromagnetic exploration, to achieve the effect of improving the signal-to-noise ratio and facilitating direct data compensation

Inactive Publication Date: 2020-04-28
INST OF REMOTE SENSING & DIGITAL EARTH CHINESE ACADEMY OF SCI
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However, the important problem to be faced in this process is that the magnetic gradient signal that induces the interference source may also be an effective signal for the purpose of reconnaissance, so how to retain these effective signals under the premise of suppressing the interference and improve the final reconstruction signal The signal-to-noise ratio becomes an important issue in magnetic gradient data processing

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  • Method and system for noise suppression of aeromagnetic gradient tensor data based on hybrid norm fitting
  • Method and system for noise suppression of aeromagnetic gradient tensor data based on hybrid norm fitting
  • Method and system for noise suppression of aeromagnetic gradient tensor data based on hybrid norm fitting

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[0191] The effect of the magnetic gradient data compensation method of the present invention will be verified and explained below through theoretical model data and actual measurement data. The SQUID magnetic gradient measuring instrument involved in the present invention has 6 magnetic gradient sensor output channels: G1-G6. Wherein, in the actual measurement data verification, this embodiment uses the data measured by the G1 channel to describe the compensation effect of the magnetic gradient data.

[0192] Firstly, the effect of the magnetic gradient data compensation method proposed by the present invention is verified and explained through simulation data. Assuming that the magnetic susceptibility value of the bedrock is very small, 1e-8(SI), two magnetic sources with different magnetic susceptibility values ​​and shapes are embedded inside, and the inclined plate on the left is a heterogeneous source, and its magnetic susceptibility value From top to bottom, it is 1e-3,...

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Abstract

The invention discloses an aeromagnetic gradient tensor data denoising method and system based on mixed norm fitting. The method comprises the following steps: establishing a magnetic gradient data comprehensive compensation model; obtaining a time change rate signal of observation data according to the magnetic gradient comprehensive compensation model; constructing a compensation equation basedon a signal change rate according to the time change rate signal; establishing a data fitting objective function according to the compensation equation based on the signal change rate; solving the fitting objective function to obtain compensation parameters; determining compensated magnetic gradient data according to the compensation parameters; and assessing the compensation effect according to the compensated magnetic gradient data. Through adoption of the method or device disclosed by the invention, the signal-to-noise ratio of a final compensation signal can be improved.

Description

technical field [0001] The invention relates to the technical field of geophysical aeromagnetic prospecting, in particular to a noise suppression method and system for aeromagnetic gradient tensor data based on mixed norm fitting. Background technique [0002] Aeromagnetic prospecting is an important geophysical prospecting technique widely used in mineral and environmental prospecting. In recent years, the magnetic gradient measurement system based on the superconducting quantum interferometer (SQUID) has been vigorously developed, making it possible to directly measure high-precision magnetic gradient data. , small size and many other advantages, it is considered to be the development direction of the third generation aeromagnetic detection. At present, my country has built a prototype of a full-tensor magnetic gradient measurement platform based on SQUID, which is different from the traditional aeromagnetic gradient measurement flight platform that uses an airborne metho...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V3/38
Inventor 纪双西郭子祺乔彦超刘建英秦静欣
Owner INST OF REMOTE SENSING & DIGITAL EARTH CHINESE ACADEMY OF SCI
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