目标激光脉冲散射四阶统计特征理论建模及其应用研究

项目名称： 目标激光脉冲散射四阶统计特征理论建模及其应用研究

项目编号： No.60801047

项目类型： 青年科学基金项目

立项/批准年度： 2009

项目学科： 电工技术

项目作者： 王明军

作者单位： 咸阳师范学院

项目金额： 20万元

中文摘要： 项目测量了目标表面多个样片材料的反射系数、介电常数、光学常数和双向反射分布函数等光散射试验数据，利用镜向反射光强法和KK法反演其物理光学特征。导出了二维随机粗糙面脉冲散射的四阶矩和双频双点互相干函数，数值分析了四阶矩受相干带宽、散射角分布的影响，以及强度相关函数的空间和时间分布情况。详细研究了体目标散射场量的二阶统计特征如散射截面，散射功率，双频互相干函数等。分析目标表面材料的介电常数和粗糙度，大气环境等因素对其散射特征的影响。在非相干和相干散射条件下，数值仿真了几种典型目标如球、锥、圆柱的激光一维距离像和多普勒频谱散射特征。研究目标的几何尺寸、运动速度对其激光成像探测的影响。依据目标不同缩比尺寸，获取光强空间分布和尺寸缩放比例间的变化关系。建立运动目标的轨道型，得到了具有简单在轨运动目标的光散射特性。在粗糙体目标激光脉冲四阶统计特性理论成果的基础上，研究了平动平板和旋转圆柱激光散射强度互相关函数及功率谱密度统计特征。总之，目标与激光脉冲散射四阶统计特征项目的完成，为进一步开展各类目标的激光探测提供了相应的技术支持和奠定了的预先理论研究基础。

中文关键词： 激光脉冲散射；目标激光探测；强度相干散射；四阶矩激光散斑

英文摘要： This project have been measured a variety of sample materials of target on the light scattering characteristics such as the reflected coefficients, dielectric constants, optical constants spectra BRDF statistical models and so on. It is utilized specularly reflected intensity method the Kramers-Kronig (KK) relations to numerically deduct the relevant tion coefficients Physical characteristics of optics.It researches the second order statistical charecterestics of two-frequency correlation function and cross section of the laser pulsed scattering from these rough surface.The fourth order moment（FOM） statistical charecterestics and two-frequency two-point correlation function of laser pulse scattering from two-dimensional random rough surface are derived, and calculated that the distributions of FOM varied with the coherence bandwidth frequency difference and scattering angles and intensity spectral correlation of the backscattered field in time and space domain. the second order statistical charecterestics of scattering cross section, power andtwo-frequency correlation function of the laser pulsed scattering from the target with rough surface. It detaily analyses the influence of these scattering characteristics for example dielectric constants, coarseness, atmosphere and other factors. Under the coherent and uncoherent condition,the laser range profile and Doppler spectral scattering characteristics for typical targets including sphere, cone and cylinder are be numerically simulated. In the same time, it discussed their changes with their dimesions and speeds. According to their deferent dimensional proportions, it get relations between the light intensity and their cale-model ratio. It builds the orbit models in order to calculate the light scattering characteristics in their moving orbits. Based on theortical results of the laser pulse scattering FOM characteristics, It investigates the laser scattering normalized intensity's covariance and power spectral density function from the horizontally moving board and rotating cylinder. In conclusion, the project finished the laser pulse scattering FOM characteristics of tagets, which further offer technologies and theortical foundations in many laser applied detections.

英文关键词： laser pulse scattering; target laser detection; intensity correlation scattering; the fourth order moment;laser speckle