Local coupling-based time domain iteration physical optical method rapid analysis method

The invention discloses a time domain iteration physical optical method rapid analysis method based on local coupling, and the method comprises the steps: firstly carrying out the modeling of a target, and carrying out the fitting of the surface appearance of the target through triangular surface element subdivision; setting an incident wave as a modulation Gaussian pulse, and carrying out time discrete sampling on the incident wave; secondly, whether the source triangles meet local conditions or not and whether time delay between the source triangles and the field triangles meets the requirement for the duration of echoes or not are judged, the coupling effects of all the source triangles meeting the conditions on the field triangles are calculated, and all the coupling effects are accumulated to obtain induction current of the surface of each discrete surface element; and finally, calculating a far-region scattering field of each surface element according to the induction current, and performing accumulatio