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Very low frequency radio wave propagation time-varying characteristic prediction method combined with IRI model

A technology of radio wave propagation and time-varying characteristics, applied in the field of electromagnetism, can solve the problems of very low frequency electromagnetic wave measurement error, large correction error and so on

Active Publication Date: 2019-06-07
XIAN UNIV OF TECH
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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for predicting the time-varying characteristics of very low frequency electromagnetic wave propagation combined with the IRI model, which solves the problem of large measurement errors and correction errors of very low frequency electromagnetic waves in the prior art

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  • Very low frequency radio wave propagation time-varying characteristic prediction method combined with IRI model
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  • Very low frequency radio wave propagation time-varying characteristic prediction method combined with IRI model

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[0084] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0085] In the present invention, a method for predicting the time-varying characteristics of very low frequency radio wave propagation combined with the IRI model, the derivation process is as follows:

[0086] Earth-ionosphere waveguide model:

[0087] The actual VLF radio communication or navigation system uses a vertical transmitting antenna whose height is much smaller than the wavelength and can be idealized as a vertical electric dipole. For radio waves in this frequency band, both the ground and the ionosphere have good reflection properties, and the distance between the two reflecting walls is comparable to the wavelength of radio waves. Radio waves are reflected back and forth multiple times between the ground and the ionosphere, and are guided forward by two reflecting walls. This propagation mechanism is called waveguide propagat...

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Abstract

The invention discloses a very low frequency radio wave propagation time-varying characteristic prediction method combined with an IRI model, and the method comprises the steps: firstly deducing and calculating an electric field component Er, solving ionosphere surface impedance [delta]i, and obtaining ionosphere electron density Ne and electron temperature Te which change along with the height; oxygen atom density NO changing along with the height is obtained; the molecular density of the oxygen gas is as shown in the specification, and the molecular density of the nitrogen gas is as shown inthe specification, the molecular density of the oxygen gas is as shown in the specification, the molecular density of the nitrogen gas is as shown in the specification; combining a calculation formula of the ionosphere collision frequency ve to obtain a collision frequency ve which changes along with the height of the ionosphere; substituting the obtained collision frequency and electron densitydata into an ionosphere surface impedance calculation method, and further updating and correcting the ionosphere surface impedance [delta]i; substituting the updated surface impedance [delta]i of theionized layer into an electric field intensity calculation formula, further solving the field intensity Er corresponding to different times, drawing a change graph of the field intensity along with different times through simulation, comparing a result with actual measurement data, and further analyzing and predicting the change characteristics of the field intensity along with time. According tothe invention, the problems of very low frequency electromagnetic wave measurement error and large correction error in the prior art are solved.

Description

technical field [0001] The invention belongs to the technical field of electromagnetism, and in particular relates to a method for predicting time-varying characteristics of very low frequency electric wave propagation combined with an IRI model. Background technique [0002] Very low frequency electromagnetic waves propagate in the ground-ionospheric waveguide, with long transmission distance, small propagation attenuation, and stable amplitude and phase, so they are widely used in the fields of ultra-long-distance communication, navigation, positioning and timing, especially in underwater submarine communication Almost the only option. For the very low frequency electromagnetic waves propagating along the "earth-ionosphere" waveguide structure formed by the lower edge of the low ionosphere and the ground, the non-uniformity and time-varying nature of the ionosphere, the fluctuation of the ground and the change of geological types, the geomagnetic field space-time Changes,...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCY02A90/10
Inventor 蒲玉蓉席晓莉辛楠
Owner XIAN UNIV OF TECH
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