基于多重分形分析的核爆与雷电电磁脉冲识别

摘要

Here, the discrimination of nuclear explosion and lightning electromagnetic pulse was studied using multi-fractal analysis, these EMP signals usually have nonstationary and nonlinear characteristics. The multi-fractal generalized dimensions D2 ～D8 and their variation ratios for nuclear explosion and lightning electromagnetic pulses were calculated. Through analysis, it was found that the rates of change of generalized dimensions can reflect the different mechanisms of nuclear explosion and lightning; the discrimination of NEMP and LEMP based on the rates of change of generalized dimensions is more effective and more stable than that based on generalized dimensions.%据核爆与雷电电磁脉冲信号非平稳、非线性特点,对NMEP与LEMP信号进行多重分形分析,计算二者多重分形广义维数D2～D8及广义维数变化率.分析发现广义维数变化率能反映核爆、雷电不同的产生机理,与广义维数相比,用广义维数变化率作为特征,对NEMP与LEMP识别率更高、更稳定、更有效.