Impulse function representation method for lightning return stroke channel base current

Abstract

The invention provides an impulse function expression for describing lightning return stroke channel base current. An impulse function, which can be regarded as the modification of a double exponential function, can fully reflect standard-specified lightning current waveform characteristics and also overcomes the adverse factors of the base current models of the double exponential function and a Heidler function in lightning return stroke electromagnetic field calculation, not only is a first-order derivative continuous when t is equal to 0, but also the impulse function has an explicit time integral expression, and thereby a lightning return stroke electromagnetic field can be conveniently analytically calculated. In addition, in order to accurately obtain parameters which are used by the impulse function to represent the standard waveform of lightning current, a waveform nonlinear curve fitting method can be adopted.

Description

technical field [0001] The invention is applicable to the modeling of the current at the bottom of the lightning return channel, uses an impulse function to describe the current waveform at the bottom of the lightning channel, and can be widely used in the theoretical calculation of the lightning return electromagnetic field. Background technique [0002] With the rapid development of microelectronics technology and information technology, the integration of electronic information products is getting higher and higher, and their electromagnetic susceptibility is also getting higher and higher, and a very weak electromagnetic field may cause harm. In the late 20th century, the lightning electromagnetic pulse (LEMP) generated by lightning strikes caused more and more serious harm to electronic information equipment and systems containing sensitive microelectronic devices, and the losses caused were also increasing year by year. [0003] Due to the strong accidental occurrence ...

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Problems solved by technology

[0009] The purpose of the present invention is to provide a kind of can not only reflect the waveform characteristic of lightning current truly, but also be the analytic expression of the current at the bottom of the lightning return channel bottom of integrable function, and focus on solving the current function at the bottom of the existing lightning return channel without continuity at t=0 Problems that are inconvenient to calculate the lightning return electromagnetic field such as the first derivative of , or there is no explicit integral expression

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