Far-field calculation of NEMP simulator near ground by transfer function

The paper discusses how to predict the field far away from simulator near the ground only by measured near field and calculation without re-measurement. An inverse derivation method is adopted. Firstly, the near-field waveform without ground, the far-field and its mirror point waveform can be obtained through numerical simulation, and the transfer function between near-field and far-field without ground is established. Then, the plane wave obliquely incident on the ground is decomposed into a wave perpendicular to the incident plane and a wave parallel to the incident plane. After taking into account the ground reflection coefficient, the scattered waves of the two kinds of polarized waves can be obtained, and the estimated field value at the specified point can be obtained by superposition with the direct wave.