Study On Methods And Applications Of Target Recognition In Wideband High Resolution Radar Seeker Under Different Angle Measurement Methods

In this paper, high resolution range steady imaging under the conical angle measurement, angle glint suppression under conical angle measurement , target recognition under momopulse angle measurement are studied.In chapter 1, the background and basic theories of the paper are introduced. First the progress of anti-tank homing weapons is introduced, then the research and progress of high resolution imaging information processing, angle glint theory , signal processing under clutter environment are introduced . At last the main works of the paper is introduced.In chapter 2, high range profile using stepping frequency signal is first introduced. The influence of movement on the profile is studied, cyclostationary theory is used to estimate the movement parameters of the moving targets under low S/N environment. Simulation results proved this method is efficient to estimate the movement parameter in color Gaussian noise and to get good profile. The impact of the conical scan on range profile is analyzed, and the cyclostationary method is used to estimate and dispel the interference of conical modulation. Simulation test results show the method can provide good profile.In chapter 3, the glint theory is presented including the forming mechanism and modeling of the glint. The glint suppression using high resolution range profile under conical angle measurement is studied, The angle information in signal components of scatters are extracted and averaged to suppress the glint. Nonlinear Kalman Filtering methods under near spherical coordinate are analyzed and used to get more accurate tracking.In chapter 4, firstly the problem encountered in target recognition using high resolution radar imaging is discussed. The 3D imaging using monopulse angle measurement and range profile is analyzed, the imaging using one or multiple profiles are compared. The problem of target recognition using 3D monopulse imaging is discussed. To improve the recognition under low range resolution, the range profile and angle measurement are combined to get 3D information and amplitude of scatters. Several methods are compared, simulation shows better results than only using range profiles.In chapter 5, a six channels data acquisition system used in three seeker system is developed to acquire data for target recognition.In chapter 6, the main works of this dissertation are summarized and the future researched areas are pointed out.