Research On Optimization Technology Of Target Scattering Imaging Algorithm

This paper studies related optimization techniques to address the shortcomings of conventional imaging algorithms for low-resolution and large-volume data.This includes the study of large rotation angle imaging algorithms,super resolution imaging algorithms,and fast imaging methods.Finally,scattering field reconstruction software for the entire component is developed to evaluate the scattering characteristics of complex targets based on actual engineering requirements.The study of high-resolution imaging algorithms includes the Convolution Back Projection(CBP)algorithm,which improves the resolution by increasing the radar rotation angle,and the MUSIC algorithm,which achieves ultra-high resolution imaging by harmonic estimation.Firstly,we will establish the imaging model of ISAR rotation target,describe the theoretical basis and mathematical model of the CBP and MUSIC algorithms,and discuss the factors that affect the resolution of 2D images under the condition of large rotation angle,which is helpful to achieve higher quality images.Secondly,taking into account the shortcomings of CBP algorithm,which is a large-scale computation,this study proposes an optimization method to improve the computational efficiency.Finally,for the 2D MUSIC spectral peak search,this paper employs a method to transform the 2D problem into two independent 1D problems,which effectively reduces the computational complexity while improving the image resolution.Based on the features of conventional imaging algorithms with large-scale data processing,this paper proposes a fast imaging method for 3D and 2D imaging of complex targets by acquiring the surface current distributions of the target at a single frequency and a single radar exposure angle.First,the core technology of the fast imaging method,the multilayer fast multipole method(MLFMA),was introduced,followed by the implementation process of the fast imaging method and the validation of its effectiveness by simulation.In the study of scattering properties of targets,this paper combines component decomposition method and scattering center theory to achieve component-entire scattering field reconstruction using GUIDE.Through simulation and experimental validation of several complex target models,we show that this software can be used to predict the scattering properties of complex targets.