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System and method of determining sky-wave propagation characteristics

A technology of sky-wave propagation and propagation characteristics, which is applied in the system field of determining sky-wave propagation characteristics, and can solve problems such as ionospheric and air displacement currents, sky-wave limitations, etc.

Active Publication Date: 2016-08-24
INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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AI Technical Summary

Problems solved by technology

However, the existing or traditional "atmosphere-rock layer" half-space propagation model does not take into account the influence of factors such as ionosphere and displacement current in the air, which severely limits the application of sky waves for geophysical prospecting

Method used

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  • System and method of determining sky-wave propagation characteristics
  • System and method of determining sky-wave propagation characteristics
  • System and method of determining sky-wave propagation characteristics

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Embodiment 1

[0061] (1) The established model is as follows figure 2 As shown, the ionosphere is set to layer -1, the air layer is layer 0, the source is placed in the air layer, and the height from the surface is h 0 . The origin of the coordinate system is set on the surface directly below the center point of the source, z is positive downward and negative upward, so the height of the ionosphere is negative, assuming that the thickness of the bottom layer of the ionosphere and the earth layer is infinite.

[0062] The effective height of the bottom interface of the ionosphere in the model, that is, the thickness of the air layer is 100km, and the effective resistivity of the ionosphere is 1×10 4 Ω·m. The relative permittivity ε and relative permeability μ of each layer are set to 1.

[0063] (2) Formula derivation

[0064] h 0 A horizontal galvanic source is placed at the height for the harmonic current I

[0065] I=I 0 e -iωt (1)

[0066] After introducing the vector bit A, i...

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Abstract

The invention discloses a system for determining sky-wave propagation characteristics. The system comprises a sky-wave propagation path determination module, a sky-wave propagation model building module and a sky-wave propagation response module. The sky-wave propagation characteristics comprise one or more selected from whole-space propagation characteristics, slow-decaying propagation characteristics and long-distance propagation characteristics of the sky-wave, and the characteristics are characterized by electric field component response and magnetic field component response. The system and the method can accurately depict the whole-space, the slow-decaying and the long-distance propagation characteristics of the sky-wave, and a foundation is laid for receiving and detection of ultra long-distance electromagnetic signals.

Description

technical field [0001] The present invention relates to a system and method for determining sky-wave propagation characteristics, and further relates to the application of the system and method for deep exploration. Background technique [0002] "Extremely low-frequency ground-penetrating engineering" is a new method for detecting electrical fine structures within a depth of 10km underground by generating strong extremely low-frequency electromagnetic waves through high-power artificial sources. combined product. It lays a limited long-distance (tens of kilometers) cable source in a high-resistance area near the ground, emits 0.1-300Hz electromagnetic waves with high power (greater than 500kW), and receives the electromagnetic signal in most of the country to achieve large-depth ground-to-earth electromagnetic waves. detection purpose. WEM is characterized by strong signal strength for artificial transmission, strong anti-interference ability, stable signal, small measurem...

Claims

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Application Information

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IPC IPC(8): G01V3/12
CPCG01V3/12
Inventor 底青云王妙月陆建勋薛国强
Owner INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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