Lightning early warning method based on 3D atmospheric electric field and memd

Abstract

The invention discloses a thunder and lightning warning method based on a three-dimensional atmospheric electric field and MEMD. The method comprises the following steps of firstly, carrying out MEMDalgorithm decomposition on a three-dimensional atmospheric electric field signal, and acquiring the component set and the balance set of each phase of a multielement intrinsic mode function IMF afterthe three-dimensional atmospheric electric field signal is decomposed by the MEMD; and then, calculating and observing the energy of the component of the first phase of the three-dimensional atmospheric electric field signal corresponding to the multielement intrinsic mode function IMF in x axis, y axis, and z axis directions, and if the energy value of any one phase component is changed continuously and abruptly, carrying out thunder and lightning warning. In the invention, a high frequency electric field component is extracted, the interference of a complex electromagnetic noise on an atmospheric electric field is reduced, thunder and lightning warning time is increased, and a missed alarm rate is reduced.

Description

technical field [0001] The invention relates to a lightning early warning method, in particular to a lightning early warning method based on three-dimensional atmospheric electric field and MEMD. Background technique [0002] Atmospheric electric field is an important parameter of atmospheric physics, and the average strength of atmospheric electric field near the ground is about 130V / m. During the lightning occurrence, the electric field intensity on the ground presents the characteristic of pulse variation, and the peak value can reach tens of kV / m. During the lightning discharge process, the return stroke current is large, the time is short, and the electromagnetic radiation is strong, which is easy to cause serious disasters and accidents. Accurately measuring changes in the atmospheric electric field, combined with an optimized algorithm, realizes effective early warning of thunderstorm clouds, which has important theoretical and application value for studying the mech...

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Problems solved by technology

[0006] The technical problem to be solved by the present invention is to address the shortcomings of traditional electric field instruments and existing lightning early warning methods. A lightning early warning method based on three-dimensional atmospheric electric field and MEMD is proposed to extract high-frequency electric field components and reduce the impact of complex electromagnetic noise on the atmosphere. Electric field interference, calculate the IMF energy in the horizontal direction x, y and vertical direction z, improve the lightning warning time and reduce the false alarm rate

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