Estimation Of Ship Targets Radar Cross Sections For HFSWR

RCS (radar cross sections) of target is an important measure of the target scattering properties, which is the most efficient spectrum characteristic for radar target identification (RTI) in HF band. Furthermore, RCS not only can be usable for signal processing, testing characteristics and classification of target, but also can be the basis for ship target detection. Ship and airplane targets locate in the resonance region for the working frequency of high frequency surface wave radar (HFSWR). This feature is the foundation of HFSWR target identification. In addition, it is available for classification and identification of target, which is indispensable to rational allocation of extension indicators in the radar system design process. According to this research background, the paper carries out in three aspects which are radar target scattering characteristic analysis, the influence factors of target RCS and experiments verification .To estimate the scattering characteristic of ship targets in HF band, this paper firstly introduces the definition of radar cross section, and puts forward the characteristics of radar target scattering section. According to the characteristics of target scattering properties of HFSWR, this paper presents a calculation method which is based on FDTD. This method is proved to be suitable for ship RCS calculation in resonance region. Surface modeling software 3D-MAX method is used to model an accurate typical vessel. And the finite element method is used to model mesh dissection. FDTD algorithm is based on principles of compiler MGL-RCS calculation software, it calculates radar cross sections of oversea ship targets for radar resonance region. It analysis radar cross sections of ship targets, and summarizes the characteristics of RCS curve resonant area in HF band.Then, the influence factors of target RCS are analyzed. According to the calculation, the way of grid computing will affect the target RCS. It discusses the meshing effect on the target scattering characteristics. High-frequency ground radar operating frequency is 3MHz-30MHz. To elect the frequency range of ships for target detection, it analyzes the frequency influence of target the RCS calculation. If radar azimuth is set up different, the ships will have different RCS. It analyzes the azimuth angle for the influence of radar target RCS. Ships structure factors (length, width, hight) have effects on the target RCS calculations. It changes length, width and hight dimensions. The RCS is calculated and analyzed . The simulation results show that the height has a significant effect for ship target RCS.Finally, to verify the proposed three-dimensional modeling and finite difference time domain method, for example, it gets the target spectrum measured RCS from the back scattering with the ship which is sailing on the Bo-hai Bay from; then the three-dimensional vessel modeling, simulation, and measured values of simulation errors, which demonstrate that the proposed algorithm is suitable for the target RCS calculations of resonant area in HF band.This paper, by algorithm improved and experiments verification, the arithmetic of FDTD and the modeling method based on 3D - MAX are proved to be suitable for the target RCS calculations of resonant area in HF band. Ships for ground RCS radar system design and parameter Settings provide theoretical support.