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Frequency domain aviation 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 field, single signal frequency, and low signal-to-noise ratio, and achieve light weight, low economic cost, and high signal-to-noise ratio Effect

Active Publication Date: 2016-07-27
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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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 invention provides a novel frequency domain aviation extremely low frequency electromagnetic method. According to the method, an extremely low frequency electromagnetic signal which is transmitted by a ground high power launching pad is used. A launch vehicle takes a magnetic sensor to synchronously receive the magnetic signal of the launching pad above a target zone to identify a target. The method overcomes the disadvantages of shallow detection depth, heavy equipment, rigour construction demanding, high economic cost and the like of the existing frequency domain aviation electromagnetic method, takes into account the advantages of aviation extremely low frequency method and aviation natural electromagnetic field method, and has the advantages of deep detection depth, simple construction condition, portable equipment, high operability, low economic cost and the like.

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 Applications(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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