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

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,...

AI Technical Summary

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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