Research On Target Electromagnetic Algorithm And Forward Parametric Modeling Method In High Frequency Region

The radar characteristics of the target are of great significance in the military field of target recognition,electronic countermeasures,etc.,and the radar cross section(RCS)is commonly used to describe.The rapid development of computer technology has promoted the development of information technology-oriented real-time monitoring,efficient extraction,and accurate identification.Computer simulation technology has also become one of the important ways to accurately predict RCS,thus promoting electromagnetic scattering in the radar field.Therefore,the research on radar scattering characteristics is practical and valuable topic.In this paper,the high-frequency prediction method and the forward parametric modeling method are studied.For edge structure,a method of edge identification and separation is proposed,which achieves the separation and independent output of target edge parameter information.Based on this,a parametric forward modeling method for edge structure is proposed.The simulation and parametric reconstruction of the target are realized by the above methods.The correctness of this method is verified by comparing RCS data and SAR imaging.The specific contents are as follows:1?The electromagnetic scattering theory and RCS are briefly described.Based on the PO method and GO-PO hybrid method of high frequency prediction electromagnetic algorithm,the estimation calculation of the primary scattering field and the secondary or multiple scattering fields of the target plane structure is studied.The process of establishing,segmenting and zoning the target geometric model,and the method of judging the secondary or multiple illumination surface of the target are also introduced.Based on the target appearance structure and incident conditions,the target simulation RCS results are analyzed to realize the description of the target scattering characteristics and mechanism.2?The diffraction characteristics of the target edge structure are studied.Aiming at complex targets,the method of geometric model blanking discrimination is introduced.In order to accurately identify and separate edges,a method for recognizing,merging and separating straight wedge edges based on linear properties is proposed.and the information of edge parameters including wedge coordinates,unit vectors and normal vectors of wedge surface is given.Based on the ILDC theory,the calculation of the edge diffraction field and the processing of the singular point problem are studied,and the simulation prediction of the edge diffraction field is realized.3?The spatial ray tracing and diversity technique with GO-PO hybrid method is applied to the complex targets,and target scattering sourcesare separated,and the quantitative calculation of the scattering field and the screening of the strong scattering sources are realized.For the same target,the ranking results of strong scattering sources are output under different incident attitude angles and frequencies,and the different scattering characteristics of the same target under different incident conditions are studied.4?The forward parametric modeling of the target's attribute scattering center is studied.The effectiveness of the method is verified by reconstructing the scattering characteristics of the target'sparametric modeland comparing it with the measured or simulated data.It should be noted thatthe establishment and separation of the parametric model of the wedge edge structure are proposed.By comparing the parametric reconstruction and simulating the SAR image,the correctness of the method is verified.