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A kind of thunderstorm early warning method

A thunderstorm and early warning time technology, applied in the direction of electromagnetic field characteristics, can solve problems such as prolonging early warning time, and achieve the effect of improving quality

Active Publication Date: 2017-05-31
NANJING UNIV OF INFORMATION SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to solve the technical problems raised by the above-mentioned background technology, the present invention aims to provide a thunderstorm warning method, which overcomes the influence of atmospheric electric field signals by environmental factors, improves data reliability, and prolongs the warning time

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Embodiment Construction

[0024] The technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0025] like figure 1 Shown flow chart of the present invention, a kind of thunderstorm early warning method, comprises the following steps:

[0026] (1) Take the atmospheric electric field data as the original input signal x(t), and add m groups of different normal distribution white noises to the original input signal x(t) in turn, so as to obtain m groups of data sequences x i '(t), i=1,2,...,m.

[0027] (2) For each set of sequences x i '(t), find its maximum value and minimum value, use the cubic spline interpolation function to fit the upper and lower envelopes, and obtain the first mean value m i,1 (t),x i '(t) and m i,1 The difference between (t) is denoted as h i,1 (t), put h i,1 (t) As a new data sequence, check whether it satisfies the IMF condition, if not, then use h i,1 (t) replace x i After '(t), re-do step (2) k time...

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Abstract

The invention discloses a thunderstorm early-warning method; the development and change of thunderstorms are reflected by tracking electric field signals and by means of variance features of decomposing layers subjected to EEMD (Ensemble Empirical Mode Decomposition) decomposition; the thunderstorm early-warning is performed by the number of the decomposing layers corresponding to the maximum variance; the oscillating feature of atmospheric electric field signals is utilized sufficiently; and the forecasting accuracy and the early-warning time are improved greatly.

Description

technical field [0001] The invention belongs to the technical field of weather forecasting, and in particular relates to a thunderstorm early warning method. Background technique [0002] Thunderstorm is a medium-to-small-scale weather process accompanied by various weather phenomena such as hail, strong wind, and lightning. Its frequency of occurrence varies from place to place, and local characteristics are obvious, making forecasting very difficult. With the rapid development of my country's social economy, high-rise buildings and communication facilities are increasing, and the losses caused by thunderstorms are also increasing year by year. Strengthening the analysis and research on the occurrence of thunderstorms is of great significance to disaster prevention and reduction, agricultural production and other aspects. According to the principle that conductors generate induced charges in the electric field, the atmospheric electric field meter can continuously measure ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R29/08
Inventor 行鸿彦张强季鑫源徐伟
Owner NANJING UNIV OF INFORMATION SCI & TECH