Ground-air short-offset electromagnetic detection system, multi-source emission signal separation method

Abstract

The invention belongs to the field of geophysical exploration, and particularly relates to a ground-air short-offset electromagnetic detection system and a multi-source emission signal separation method. The system comprises a transmitting system and an observation system, wherein the transmitting system comprises one or more transmitting devices which are arranged on the ground and are based on along grounding wire source; the observation system comprises a plurality of observation devices; each observation device comprises flight equipment, a single-component magnetic field sensor and a receiver; the number of the observation devices used for collecting single-component magnetic field data is larger than that of the transmitting devices; a plurality of observation devices carry out flight observation in a set observation area according to a preset formation to obtain a plurality of corresponding groups of observation signals; the set observation area is that the distance from any point to each transmitting device is smaller than N times of the to-be-detected depth, and N is a set value. Economic and flexible multi-component observation is realized, and more possibilities are provided for high-resolution, economic and rapid detection and underground structure information extraction of a deep large ore deposit.

Description

technical field [0001] The invention belongs to the field of geophysical exploration, and in particular relates to a ground-space short-offset electromagnetic detection system and a method for separating multi-source emission signals. Background technique [0002] The electromagnetic method is a geophysical detection method based on the principle of electromagnetic induction. It is based on the difference in physical properties such as the conductivity of the underground medium, and observes the response electromagnetic field (ie, the secondary field) generated by the earth under the excitation of natural or artificial field sources. The spatio-temporal distribution of the secondary field finally realizes the extraction of underground structure information, so it is widely used in the investigation of minerals, groundwater, geothermal and other resources, as well as geological mapping, environmental engineering and other fields. [0003] The traditional electromagnetic detec...

AI Technical Summary

Problems solved by technology

In terms of multi-component observation, the current mainstream solution is to install electromagnetic sensors and other auxiliary sensors in a very highly integrated pod, which will result in a large weight and size of the pod, which can only be carried by manned helicopters. Significant increase in application costs

Although UAV technology has developed rapidly in recent years, it is still difficult for ordinary civilian low-cost UAVs to carry the above-mentioned multi-component sensor pods.

In addition, the existing semi-aerial method uses a single emission source observation method, because this single emission source has only one polarization direction, which is not conducive to the fine detection of underground anisotropic electrical structures

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