Research On Simulation Software Of Electromagnetic Scattering For Near Space Aircraft Based On Different Algorithms

Over the past decade,the Near Space Hypersonic Aircraft have developed rapidly,which makes the detection and the identification of the aircraft become more difficult.Because of its high speed,flight track changeable and its atmospheric environment,hypersonic aircraft are hard to be located,resulting in more difficult to be intercept.Therefore,the study of the electromagnetic scattering characteristics of hypersonic vehicles can help us to improve the identification probability of such aircraft.Therefore,using the Intel Visual Fortran and Visual Studio 2013 as the development platform,based on the Mo M and Finite-Difference Time-Domain Method,a simulation software for calculating the electromagnetic scattering of Near Space Hypersonic Aircraft is developed.The software can calculate the Radar Cross Section of Near Space Hypersonic Aircraft with plasma sheath covered.After years of innovation and development,researchers have accumulated a large number of mature Fortran programs about the three major algorithms of Computational Electromagnetics-FDTD,FEM and Mo M.But most of these programs are running in the console operating environment,the visual comparison and the user interface interaction are poor.On the contrary,VC++/MFC can provide a friendly user interface.The use of calling Fortran programs via C++,not only taking advantage of the efficient of Fortran in the field of scientific computing but also combining the powerful interface functions MFC,and with using multi-thread to run the time-consuming computing program in background,we can design a software for computing electromagnetic scattering using these algorithms and MFC interface functions.The process of the software: First,meshing and optimizing the target model according to the needs of the grid size.For hypersonic aircraft it can load the plasma flow field data and then coupling the model and the plasma;Second using the visual interface to set the excitation source,observation position and other parameters for calculation.In order to improve the software performance a variety of methods are used.For example,the use of ray tracing and octree acceleration technology to optimize the model meshing;Generating dynamic link library with Fortran programs which provides parameters input interface,then calling the dynamic link library with C++;Implementing the model display by Open GL,the model scaling,the model translation,three-dimensional coordinate positioning and other basic functions;Using VC + + and Microsoft SQL Server 2014 to achieve database management,the main functions include importing and exporting data tables,querying data and deleting data;To avoid the phenomenon of suspended animation,the software uses multi-thread;In order to facilitate the analysis of simulated results,the data will be drawn into two-dimensional graph,which make it more easy to observe.The software realizes the visualization of the target model,the flow field data,the model grid segmentation data,the calculation results and so on,which is more convenient for calculation and the check of simulation results.In this paper,the electromagnetic scattering characteristics of typical hypersonic vehicles are analyzed by software.The work can be applied to the theoretical analysis of detection and identification of hypersonic aircraft.