Dynamic Warhead Target Characterization Based On Scattering Center Mode

Radar is a kind of microwave remote sensing equipment with electromagnetic wave as the carrier.Extracting feature parameters from target electromagnetic scattering data is an important basis for understanding radar image problems.Starting from the analysis of electromagnetic scattering data and using the radar parameter model method,the problem of feature extraction from the target scattering center can be transformed into the problem of parameter acquisition under the electromagnetic scattering data model.The time-frequency map generated by the sequence of target echo varying with time is analyzed,the dynamic scattering center of a single warhead is characterized by the method based on time-frequency map matching,and the variation rules of the coupling scattering center of static double warhead and the coupling scattering center of precession warhead are analyzed.This thesis mainly includes the following three parts:The first and second chapters mainly study the background and research status of scattering center characterization at home and abroad,elaborate the scattering center model and parameter estimation theory,study the time-frequency analysis theory,then elaborate the genetic algorithm and time-frequency map matching theory,and give the basic process of time-frequency map matching.The third chapter mainly studies the modeling and characterization method of dynamic scattering center for a single precession cylindrical cone,as well as the simulation and analysis of numerical examples.The scattering center parameter extraction method based on genetic algorithm is studied.The echo constructed by a single warhead using dynamic scattering center is compared with the echo of full wave method.A numerical example shows the effectiveness of the method.Furthermore,considering the frequency dependence and the expansibility of precession angle,it is used to quickly analyze the scattering center characterization of other frequencies or other precession angles,and compared with the target echo calculated by full wave method.In Chapter 4,the dynamic target characterization of coupled scattering center is studied in detail,including static coupled scattering center and dynamic coupled scattering center.Firstly,the whole process of extracting the static coupling scattering center is given,and compared with the static coupling echo,which shows the necessity and effectiveness of considering the coupling scattering center.Secondly,the characterization of dynamic coupling scattering center based on genetic algorithm is studied,the coupling scattering center between precession warheads is analyzed,and the echo reconstructed by scattering center is compared with the echo simulated by full wave method.The validity of the characterization of the coupling scattering center is proved.The fifth chapter summarizes the work of the full text and looks forward to the follow-up work.