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A Frequency Domain Aeronautical Extremely Low Frequency Electromagnetic Method

An extremely low frequency, frequency domain technology, applied in the field of geophysical electromagnetic detection, can solve the problems of large randomness of natural electromagnetic fields, single signal frequency, low signal-to-noise ratio, etc., achieving light weight, low economic cost, and high signal-to-noise ratio. Effect

Active Publication Date: 2018-07-13
中国船舶重工集团公司第七研究院
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Problems solved by technology

[0007] In order to improve the detection depth of the airborne electromagnetic method in the frequency domain and reduce economic costs, domestic and foreign technicians have researched and developed the aeronautical very low frequency method (VLF, frequency range 3kHz-30kHz) and the aeronautical natural electromagnetic field method, but the aeronautical VLF method has signal frequency Single, uncontrollable (launched by VLF stations in various countries), and low signal-to-noise ratio, while the aviation natural electromagnetic field method has the disadvantage that the natural electromagnetic field is very random and difficult to effectively observe

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  • A Frequency Domain Aeronautical Extremely Low Frequency Electromagnetic Method
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  • A Frequency Domain Aeronautical Extremely Low Frequency Electromagnetic Method

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Embodiment Construction

[0025] The principles and features of the present invention are described below in conjunction with the accompanying drawings, and the examples given are only used to explain the present invention, and are not intended to limit the scope of the present invention.

[0026] 1. ELF electromagnetic signal transmission process

[0027] Such as figure 1 As shown, the high-power transmitting station is mainly composed of an exciter, a signal processor, a transmitter, an antenna matching tuner, and an antenna, wherein the exciter is responsible for generating a suitable excitation signal; the signal processor is responsible for converting the excitation signal generated by the exciter to The carrier small signal is detected, processed, protected and split; the transmitter is responsible for amplifying the excitation signal to be transmitted to the required power; the matching tuner is responsible for achieving the best between the transmitter and the antenna load according to the diff...

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Abstract

The present invention proposes a novel frequency-domain aviation extremely low-frequency electromagnetic method, which uses the extremely low-frequency electromagnetic signal emitted by the ground high-power transmitting station to identify the target through the method of synchronously receiving the magnetic signal of the transmitting station by the magnetic sensor mounted on the vehicle over the target area. This method overcomes the disadvantages of the current frequency-domain aeronautical electromagnetic method, such as shallow detection depth, heavy equipment, harsh construction requirements, and high economic costs, and takes into account the advantages of the aeronautical very low frequency method and the aeronautical natural electromagnetic field method. A new type of frequency-domain airborne electromagnetic method with the advantages of simple conditions, portable equipment, strong operability, and low economic cost.

Description

technical field [0001] The invention belongs to the field of geophysical electromagnetic detection, and can be widely used in various fields such as resource exploration, geological investigation (regional lithology and structural geological mapping), hydrological environment exploration and underwater target detection. Background technique [0002] The frequency-domain airborne electromagnetic method is one of the commonly used measurement methods for airborne geophysical prospecting. It has the advantages of fast speed, low cost, good trafficability, large-area coverage, and can be used in sea areas, especially in areas covered by sedimentation or vegetation. It has an effect that is difficult to achieve by general exploration methods. At present, the frequency domain airborne electromagnetic method is widely used in the general survey of iron, copper, polymetallic and precious metal minerals, groundwater resource investigation, land resource investigation, seawater immers...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V3/12
Inventor 卓贤军陆建勋闫建峰郭锐张佳炜王平朱毅超
Owner 中国船舶重工集团公司第七研究院
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