Research On ISAR Imaging And Three Dimension Reconstruction Based On Steadily Moving Target

The background of this dissertation is one project of "863" program.In this dissertation the researching includes the motion compensation of ISAR Imaging,the ESPRIT super-resolution Imaging technique and the three dimensional reconstruction based on the high resolution Radar.A new fast range alignment algorithm that based on the maximum modified kurtosis was presented;an advanced ESPRIT super-resolution imaging algorithm was propounded.Using the theory to determine the exact number of the scattering centers,this advanced ESPRIT algorithm could improve the quality of ISAR imaging;the three dimensional scattering center reconstruction theory was researched,and emulational result of reconstruction based on geometry invariability had been given.This dissertation is consisted of four chapters.Chapter one is the preface.A brief introduction of radar imaging is presented.The history and status quo are introduced. Finally,the main works of this dissertation is introduced simply.In chapter two,the motion compensation is analyzed and a new fast range alignment based on maximum kurtosis is propounded.Using the symmetry and gradational searching,the location of maximum kurtosis could be found.Then the range alignment completed on apace.In chapter three,the ESPRIT super-resolution theory was analyzed and an advanced ESPRIT super-resolution ISAR imaging algorithm was propounded.Using two different methods:New Gerschgorin Disk Estimation and Canonical Correlation Theorem to determine the exact number of the scattering centers,this advanced ESPRIT algorithm could improve the quality of ISAR imaging.In chapter four,the three dimensional scattering center reconstruction theory was researched;the reconstruction model of one dimensional high resolution radar range profile is analyzed. The reconstruction theory based on Geometry Invariability is researched and the emulational result of the steadily moving space target is presented.At last,the conclusion summarizes all the work of this dissertation and points out the future researched areas.