Time-frequency electromagnetic data collection device and method based on extremely-low-frequency electromagnetic source

Abstract

The invention provides a time-frequency electromagnetic data collection device and method based on an extremely low frequency electromagnetic source. The high-power controllable current source emission control device provides high-power controllable alternating current for the extremely-low-frequency long-distance emission antenna, and the extremely-low-frequency long-distance emission antenna directly feeds the high-power controllable alternating current into the ground through grounding electrodes at the two ends of a grounding long wire. The ground time-frequency electromagnetic signal receiving and collecting device is in communication connection with an instrument vehicle arranged in the middle of a work area, and the instrument vehicle is provided with a computer for time-frequency electromagnetic collection, control, processing and data storage processing. And a computer on the instrument truck controls the ground time-frequency electromagnetic signal receiving and collecting device to collect time-frequency electromagnetic data. According to the method, the waveguide characteristic of the manually-transmitted extremely-low-frequency high-power alternating electromagnetic signals between the ground and the ionized layer is fully utilized, the signals are transmitted to a measurement work area thousands of kilometers away, the time-frequency electromagnetic data collection efficiency is improved, the signal-to-noise ratio of the time-frequency electromagnetic data is increased, and the operation cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of geophysical exploration, in particular to a time-frequency electromagnetic data acquisition device and method based on an extremely low-frequency electromagnetic source. Background technique [0002] Geophysical exploration methods mainly include seismic method, direct current method, magnetic method, gravity method and electromagnetic method. Among them, the electromagnetic method is also called the "electromagnetic induction method". According to the difference in the conductivity and permeability of rocks or ores, the method of using the principle of electromagnetic induction to carry out prospecting and exploration is collectively referred to as the electromagnetic method. [0003] Among them, the application of surface time-frequency electromagnetic prospecting technology has played an important role in the joint interpretation of structural belts and special targets, and the joint detection and eval...

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Problems solved by technology

If there are no more roads around the construction area and within the construction area, there is no way to carry out large-scale three-dimensional time-frequency electromagnetic survey data acquisition operations, or because the time-frequency electromagnetic data acquisition station is far away from the high-power controllable current source transmitting antenna (power supply Electrode) is too far away, the time-frequency electromagnetic signal in the data acquisition operation area is too weak, the signal-to-noise ratio is too low, and effective and qualified time-frequency electromagnetic data cannot be collected

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