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Method for acquiring electromagnetic field of electromagnetic wave through interface between sea and air

A technology of electromagnetic waves and electromagnetic fields, applied in the field of obtaining electromagnetic fields transmitted by electromagnetic waves across the interface between sea and air, can solve problems such as situations that cannot be effectively resolved, achieve clear physical meaning, overcome the complexity of operations, and achieve the effect of simple methods

Active Publication Date: 2015-08-12
NORTHWESTERN POLYTECHNICAL UNIV
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

This method is simple and has clear physical meaning, but it can only be applied to the radiation and propagation of electromagnetic waves in the same medium, and the situation of cross-interface cannot be effectively solved

Method used

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  • Method for acquiring electromagnetic field of electromagnetic wave through interface between sea and air
  • Method for acquiring electromagnetic field of electromagnetic wave through interface between sea and air
  • Method for acquiring electromagnetic field of electromagnetic wave through interface between sea and air

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specific Embodiment

[0055] (1) figure 1 The division of the secondary radiation area of ​​the interface is given when the radiation source located in sea water radiates electromagnetic field into the air. These regions satisfy the following relationship

[0056] βr 1 +kρ 1 -(βr 0 +kρ 0 ) = π

[0057] βr 2 +kρ 2 -(βr 0 +kρ 0 )=2·π (7)

[0058]  …

[0059] βr n +kρ n -(βr 0 +kρ 0 ) = n·π

[0060] where r n and ρ n are the distances from the radiation source T and the field point P to the nth Fresnel zone on the interface S, and β and k are the phase shift constants of electromagnetic waves in seawater and air, respectively. where r n , ρ n are much larger than the wavelength in their respective media. Obviously, on the S surface, Z 1 The zone is a circle, Z 2 ,…,Z n The districts are rings. And the wave radiated from any point on the inner edge of each annulus and the wave emitted from the outer edge have a constant antiphase phase difference when reaching point P. The rad...

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Abstract

The invention relates to a method for acquiring an electromagnetic field of an electromagnetic wave through an interface between sea and air. Conductivity of seawater is utilized for generating an induction current of an underwater radiation source at a seawater-air interface. According to a Huygens-Fresnel principle, distribution and area size of the induction current on the sea surface is determined. Furthermore, the induction current area on the sea surface is used as an antenna of a known current density distribution. A secondary radiation is performed to the air through the induction current area on the sea surface, thereby determining the electromagnetic field distribution in the air. The method prevents direct SI integration and overcomes high operation difficulty in prior art. Furthermore the method of the invention can simply and clearly generate the physical process and field distribution of the electromagnetic wave in cross-interface communication and furthermore contains a closed expression.

Description

technical field [0001] The invention relates to a method for obtaining an electromagnetic field propagated by electromagnetic waves across the sea-air interface, which is suitable for wireless communication and data transmission using electromagnetic waves under water, between sea water and air, and belongs to the propagation of electromagnetic waves in layered media, underwater radio communication technology, etc. field. Background technique [0002] Electromagnetic waves have fast propagation speeds, are not affected by marine environmental noise and multi-path effects, and have excellent performance in penetrating seawater-air interfaces. Therefore, they are used in underwater data interaction and communication, cross-interface wireless data Monitoring network, underwater wireless sensor network and other fields have a wide range of applications and urgent needs. There are also various research methods on the radiation and propagation of electromagnetic waves in the mult...

Claims

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Application Information

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IPC IPC(8): G01R29/08
Inventor 杨坤德王宏磊郑琨马远良
Owner NORTHWESTERN POLYTECHNICAL UNIV
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