Study On TDEEC Algorithm And Its Application On Complex Object

The scattering field of the target mainly depends on its surface current,the effect of line current and line magnetic current that exist on the discontinuity of the target surface are ignored when using high-frequency electromagnetic algorithm to calculate the target scattering characteristics.Therefore,if the scattered field of surface current is calculated while the target has such a discontinuity feature,the calculation accuracy is often not accurate enough.The diffraction field generated by the target edge can be calculated by the equivalent edge current(EEC)algorithm,and the calculation results of the physical optics algorithms can be corrected to improve the accuracy.The edge data of the target needs to be extracted when using the EEC algorithm,in this paper,the approach is discussed in detail.The main content of the thesis is as follows:(1)The expression of scattering field of the ideal conductive wedge is described in detail,the components expressions that can be used to calculate the geometric optical field and the edge diffraction field are separated out.(2)The implementation details and key parameters of the dividing two-dimensional and three-dimensional grid of the complex object are given.The high quality meshing of complex model is realized based on commercial software Hypermesh.(3)A method for target edge data extraction based on exhaustive method is proposed.The numerical results show that the proposed method is accurate.(4)The approach of the singularities in the expression of the time domain equivalent edge current(TDEEC)algorithm is studied.The previous formula is replaced by an improved expression that references the transition function to improve the adaptability of the algorithm.