Influence of Mountain on Lightning Radiation Field

In order to investigate the effects of large mountain in the propagation path on the lightning radiation field, firstly the lightning radiation field is calculated by using MoM without consideration of the mountain. The calculated result is taken as the radiation source in the subsequent calculation of scattering field. The scattering field is determined with the mountain supposed to be perfect conductor. Surface element MoM is used to set up the model. Following above steps, the resulting lightning electromagnetic field in frequency domain can be obtained, which is the sum of radiation field and scattering field. By using FFT, the corresponding time domain results for different lightning waveforms are also derived. Based on the calculation, the effect of large mountain on lightning radiation field is investigated. The mountain height and the distance from lightning source to the mountain are considered respectively and some useful conclusions are obtained.