Laser Scattering Characteristics Of Radar Stations In Complex Environment

The research on the laser scattering characteristics of target and background environment plays an important role in the development of laser radar system,detection and recognition of targets,and guidance.This paper takes the radar station target in complex environment as the research object,and studies the interaction between radar station and environment under specific laser irradiation.Starting from the rough surface light scattering BRDF and LRCS,we study the radar station target in different ground background environment.Based on the secondary backscattering characteristics and the related knowledge of laser fuze on the basis of this,the laser fuze echo signal of the radar station target under local illumination of the laser pulse beam is studied,and the data obtained from the simulation is analyzed.It is hoped that the research results can provide some references for the research on the detection and identification of follow-up targets.The paper starts with studying the laser scattering characteristics of the target surface element,introduces the definition of the rough surface bidirectional reflectance distribution function(BRDF)and the commonly used BRDF model,and gives the results of the laser BRDF modeling of the surface of the target material sample used in the paper,in the target laser scattering characteristics.In the research,the LRCS and laser radar equations are two important physical quantities.Based on the basic knowledge of BRDF and LRCS as above,the problem of calculating the backward LRCS of the target of the radar station was studied.Taking the famous paving-radar radar station as a prototype and using 3Ds Max modeling software,the radar station was geometrically modeled against the paving claw's actual geometric information.What is known at the time of calculation is the incident scattering angle in the target coordinate system,which is converted to the local incident angle scattering angle by using its relationship with the plane element coordinate system,and is used for the possible occlusion problem between the bin elements and the bin elements.For the blanking algorithm,the target LRCS calculation flow based on triangular facets is given and a backward LRCS of the radar target under different wavelengths of laser irradiation in different terrestrial environments is calculated and analyzed.Subsequent study on the composite scattering problem between the radar station target and the ground background,introduces the face element method and ray method used for multiple scattering calculations and compares their advantages and disadvantages.The ray tracing isused to judge the intersection,and the scattering in all directions of the half space is calculated,and the secondary scattering LRCS combined with the target and the environment is obtained.Because the established radar station model forms three large 120-degree dihedral angle structures with the ground,studying the LRCS of the dihedral angle has important reference significance for the subsequent calculation of the LRCS of the radar station target.To verify the correctness of the algorithm,the secondary scattering of a 120-degree dihedral angle was calculated by ray method.The change of the secondary LRCS with zenith angle at the 90-degree azimuth was compared with the result calculated by the surface element method.The principle of quadratic scattering calculated by the ray method is used to program and calculate the secondary LRCS of radar targets in different ground environment backgrounds.The calculation results are plotted and analyzed by the origin mapping software.In order to study the characteristics of laser scattering under local illumination,the launch laser beam is detected by circular emission from the knowledge of laser fuze.The waveform and characteristics of the laser beam are introduced.The problem of local illumination of the target is studied.In the study of scattering characteristics of laser fuzes,the calculation of beam-scattered echo power is indispensable.The paper studies the calculation of the laser fuze echo signals.Because the laser fuze missile has a specific trajectory,the paper sets a section of the trajectory,and gives information such as the pitch angle of the specific location point on the trajectory for subsequent echo calculation.Finally,a fixed position point is selected on the motion trajectory to calculate and calculate the curve of the echo power received by different incident zenith angle laser fuzes with time,and the representative results of channel 1 and channel 2 are selected.analysis.In this paper,the problem of laser scattering characteristics is studied in detail by taking the radar station target as the research object.It is hoped that these theoretical simulation results can provide some references for the actual design and development of radar laser systems.