Electromagnetic calculation of complex urban architectual environment based on point cloud reconstruction

In a complex city environment, it is very difficult to accurately evaluate the effect of radio wave propagation due to the complex terrain, landforms and features. In order to solve the problem that the traditional physical modeling of electromagnetic computing in urban architectual environment is not accurate enough, this paper proposes a multi-view stereo method to reconstruct the complex urban architectual environment based on point cloud, obtain the accurate triangular mesh model, and obtain the electromagnetic attributes of urban environment boundary by machine learning image segmentation method. On this basis, the ray tracing electromagnetic calculation based on uniform theory of diffraction is carried out to obtain the electromagnetic situation distribution in Xiang’an campus of Xiamen University. By calculating on different resolution grid models, and comparing with the COST231-Hata model and actual measurement results, the root mean square error of the high-resolution grid model is 6.065 5 dB, which proves the effectiveness of the modeling and calculation methods in this paper.