Scattering Characteristics Of Laser Pulse On Complex Target And Its Application

Laser pulse scattering from target is the important study of laser radar characteristics of target, and has a broad application in Laser radar simulation and system validation. In this thesis, scattering characteristics of laser pulse on complex target is studied based on laser bidirectional reflectance distribution function(BRDF) of material and laser radar cross-section(LRCS), and is applied to the simulation of laser fuze echo and three dimensional(3D) laser radar imaging.Based on the theory of light scattering from rough surface, the concept of BRDF is introduced and basic properties of BRDF are also developed. A five-parameter statistical model suitable for engineering applications is obtained, and is applied to fit experimental data of material samples with genetic algorithm. Also, Laser radar cross section and range resolved laser radar cross section is introduced. Interaction of non-uniform laser pulse beam with target is explored and is used in the laser fuze echo simulation which is introduced in detail. Pixel indexing method is introduced for solving the problem of scene discretization and local illumination. Analysis of the interaction of the laser pulse and target based on BRDF is performed. Laser fuze echo under dynamic scene is obtained with the simulation software which is well designed. Especially, the framework and module intersection are established. With the software, several typical cases are simulated and the results are analyzed.For the introduction of light scattering in the simulation of 3D laser radar imaging, statistical optics theory in imaging is reviewed first. As a typical 3D laser radar system, the concept of single pulse 3D laser radar image based on APD array is introduced, and then system modules are described one by one. Fast computer graphics techniques are implemented for complex targets simulation. For typical cases, the influence of laser pulse width, target shape and optical scattering of material on 3D image is discussed. Finally the GPU-based acceleration technology is used for 3D laser imaging simulation of complex scenes with multi-material.