Multi-source frequency domain ground-air electromagnetic detection and acquisition system and method

Abstract

The invention discloses a multi-source frequency domain ground-air electromagnetic detection and acquisition system and method. The method is a brand-new and efficient multi-source electromagnetic exploration method by reasonably setting an arrangement mode of three electrical sources, simultaneously carrying out multi-source multi-frequency excitation on the ground and carrying out data acquisition by adopting an unmanned aerial vehicle-mounted receiver in the air. According to the method, the included angles of extension lines of three electric sources are 60 degrees respectively, the electric sources are arranged on the ground in an equilateral triangle shape, the midperpendicular intersection point of the electric dipole sources is located in the center of an observation area, the length of an electric dipole is generally 1 to 3 kilometers, and the directions of the three electric dipole sources are consistent and are clockwise or anticlockwise. The multi-source acquisition mode can excite an electromagnetic field from multiple angles, improve the illuminance, enhance the signal intensity of a primary field, improve the distribution characteristics of a secondary field and suppress the edge effect of a target body, facilitates the determination of the plane position of an abnormal body, and provides an optimized multi-source excitation mode for a ground-air detection system.

Description

technical field [0001] The invention belongs to the electromagnetic prospecting technology of ground multi-source excitation and aerial measurement, relates to a frequency domain ground-space electromagnetic prospecting, specifically a multi-source frequency domain ground-space electromagnetic detection and acquisition system and method, especially suitable for terrain undulations, underground structures Fine exploration of complex areas. Background technique [0002] With the sustained and rapid development of the economy, resource and environmental problems have become increasingly prominent, and people's demand for underground detection has continued to increase. The ground-air frequency domain electromagnetic method combines the dual advantages of the high-power transmission of the ground electromagnetic method and the fast non-contact acquisition of the airborne electromagnetic method. It can enter the complex terrain area to carry out deep resource exploration. In rece...

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Problems solved by technology

[0004] 1. The emission magnetic moment is limited, and the detection range is limited;

[0005] 2. The signal in the far area is weak and the signal-to-noise ratio is low, which makes it difficult to meet the needs of fine exploration;

[0006] 3. Affected by the inhomogeneous body below the field source, it is easy to cause wrong interpretation;

[0007] 4. The distribution of apparent resistivity is related to the position of the field source, which is extremely complicated and the interpretation result is unreliable

[0008] At present, multi-radiation source excitation methods have been proposed, but mainly parallel electric dipole field sources or L-shaped electric dipole field sources. The illumination is limited, it is difficult to meet the increasing demand for refined exploration

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