Research On Electromagnetic Scattering Calculation Method Based On Multi-View 3D Reconstruction

In the country's military defenses,stealth technology is a very important technology.Stealth technology is widely used in various weapons and equipment such as aircrafts and warships.Reducing the target electromagnetic characteristics(such as radar cross-sectional area)is one of the main directions of modern stealth technology research.In the process of traditional analysis of target electromagnetic properties,the modeling of the target is mainly through modern 3D modeling software(such as 3DMax,maya,etc.)to establish the model to be studied.This modeling method requires professional technicians to operate the software,and it takes a long time to build a complex target model.Not only that,for a complex surface model,it is difficult to simulate the target surface with a basic unit using 3D modeling software.The use of a three-dimensional model scanner to scan the target to create a target model can only model a single target and the scanning device is large in size,inconvenient to carry,and the three-dimensional scanning device is very expensive.In order to overcome the shortcomings of traditional modeling methods,this thesis uses the multi-view 3D reconstruction target 3D model in computer vision technology as a modeling method to study the electromagnetic scattering process.First,this thesis studies the development process of computer vision three-dimensional reconstruction in recent years.A multi-directional photo collection is performed on the target whose electromagnetic properties need to be analyzed.The target photo set is used as an input.The three-dimensional reconstruction of the target through computer vision three-dimensional reconstruction technology will output a three-dimensional model of the approximate target surface.The entire process of recovering the target surface based on multi-view 3D reconstruction includes sparse reconstruction,dense reconstruction,and surface reconstruction.For the purpose of this study,through a large number of targets for three-dimensional reconstruction experiments,the rules for collecting photographs when analyzing electromagnetic scattering in a certain angle range of the target and how to reconstruct a target with less noise are summarized.Write a program to implement a multi-view 3D reconstruction system.Secondly,the graph electromagnetic computation method is used to calculate the radar scattering cross-sectional area(RCS)based on the multi-view 3D reconstruction recovery target,and the advantage of selecting the graph electromagnetic calculation method for the RCS calculation of this new model is analyzed.Stretch projection of the target makes the computer screen fully utilized.Corresponding calculation RCS formula is given for the stretched projection target to improve the accuracy of RCS calculation;Parallel calculation method is used in the program to increase the calculation speed of the calculation target RCS.The pixel's color component is used to represent the bin's contribution to the total RCS and displayed.The researcher knows that the pixel bin contributes to the total RCS by observing the intensity of the color.The brighter the color is,the larger the RCS is,an d the darker the color is,the smaller the RCS is.Finally,a system corresponding to its RCS is programmed for the 3D reconstruction target.In order to better analyze the advantage of using graph electromagnetic calculation method to calculate the RCS calculation of 3D reconstruction target and the speed increase of parallel computing RCS proposed in this thesis,this thesis can choose to use the traditional method and the improved method to calculate the same target RCS when the software is designed.The results are compared.Finally,a complex airplane model is reconstructed using this system,and its RCS is calculated and analyzed.