Parameter Design And Method Research Of Millimeter Wave Guidance Radar Imaging System

Millimeter-wave radar plays an increasingly important role in the research field of precision guidance technology because of its good characteristics.Combining the characteristics of millimeter-wave radar and the trajectory characteristics of the terminal guidance phase,this paper studies the optimization design of imaging parameters of millimeter-wave guidance radar,refined imaging processing algorithm in frequency domain and high-precision motion compensation algorithm.The main content of the article includes four parts:In the second chapter,the imaging parameter characteristics and the influence of the terminal guidance trajectory characteristics on it are analyzed in detail,and the imaging parameter optimization design method is given.The characteristics of azimuthal resolution under large subduction Angle and small imaging azimuthal Angle of terminal guidance are analyzed,and the constraints of azimuthal resolution design in terminal guidance section are obtained.The effective width calculation methods for low cost servo antenna and high flexibility phased array antenna are presented respectively,and the corresponding widewidth imaging strategies are given based on these methods.By analyzing the real far and near end of the scene echo,a more accurate lower limit of PRF design is given.In chapter 3,the geometry of 3D imaging and the generalized oblique distance model for terminal guidance section are given.Based on the oblique distance model,the echo signal is analyzed,and different matched filters are designed for different phase terms to achieve two-dimensional high-resolution imaging processing.The higher order Taylor expansion is used to decouple the phase and compensate the higher order phase in the frequency domain.The phase factor in frequency domain is introduced to compensate the azimuthal space phase variation caused by the azimuthal position variation.Unified focusing is achieved by time domain deskew.By analyzing the geometric relation among the ground distance plane,the oblique distance plane and the imaging plane,a fast oblique ground conversion algorithm and the geometric distortion correction relation of a single target are presented.The effectiveness of the imaging algorithm and geometric distortion correction algorithm is verified by simulation experiments.In chapter 4,the high precision motion compensation algorithm is studied according to the characteristics of high acceleration in terminal guidance phase and the more sensitive characteristics of millimeter wave to motion.By constructing the slant error model,a motion compensation method based on the motion measurement data is presented.By analyzing the tolerance of motion error of millimeter wave,the accuracy requirement of millimeter wave radar imaging for motion measurement data is given.The advantages of using a variety of PGA algorithm,through the data block processing,image entropy method to select the effective data,based on the image domain integral sidelobe ratio of the weighted adaptive window,based on the image domain integral sidelobe ratio of sample selection phase gradient and the weighted kernel function,effectively improve the performance of the PGA algorithm,finally realizes the high precision self focusing in SAR image processing.The fifth chapter,based on the second,third and fourth chapters of the paper,carries out the verification of the millimeter wave radar imaging guidance system.By optimizing the parameters of the design,imaging simulation,for terminal guidance section velocity under the condition of millimeter wave radar imaging simulation system,and through the simulation of terminal guidance section of hang a fly is flying trajectory design,the use of the imaging algorithm and motion compensation algorithm for airborne hang fly admission data imaging,splicing processing,the end to verify the reliability and practicability of the millimeter wave radar imaging system.