双指数源激励下垂直电偶极子产生的极低频近场

针对雷电过程在地面产生的近区极低频电磁脉冲,推导出了双指数模型激励下垂直电偶极子产生的极低频电磁场的瞬态近似表达式.该方案基于Sommerfeld积分在准静态近似下求解,从频域出发,利用单位脉冲响应的近似结果与双指数模型激励源卷积计算的方法,通过傅里叶逆变换,得到了双指数源激励下的瞬态解析表达式,其可用于模拟雷电信号产...

Near-field propagation of ELF wave excited by double-exponential function

In the present study,the transient approximate formulas for ELF electromagnetic field excited by a double exponential function are derived due to a vertical electric dipole on the ground at near distances representing a lightning discharge process.The approximate solution is obtained from simplifying the Sommerfeld’s integrals with the quasi-static approximation.The computational scheme,simulating the characteristics of time-and frequency-responses for ELF wave representing the lightning pulse signals,exploits the results of an approximate unit impulse response from frequency domain and convolution of which with a double exponential exciting function,and provides with the analytical transient expression of the ELF waves from the inverse-Fourier-transformation.The study illustrates a simple but effective estimation for the lightning pulses in the near region in the application of electromagnetic compatibility systems.