Performance Analysis of Doppler Lidar

9307233 Frehlich Research提出了分析多普勒激光雷达的性能为真实的系统配置，包括影响的湍流和探测器的几何形状。 系统的信噪比和外差效率决定了系统的性能。 将对真实的和理想化的多普勒激光雷达系统的信噪比和外差效率进行解析和数值计算。 外差效率估计的统计行为将被确定为单元素和多元素探测器。 当折射湍流很重要时，将从理论上和数值模拟上研究使用多元件探测器来提高系统性能。 模拟还将产生由于随机气溶胶目标和折射湍流引起的真实的多普勒激光雷达信号波动的精确统计描述。 多普勒激光雷达性能的不同的物理机制将进行调查和制度，简单的分析结果是有效的将被确定。 计算将强调固态激光雷达系统的较短波长。 将从理论上确定实际大气条件下多普勒激光雷达感测体积中风变化的影响。 新的数据分析技术将被应用到多普勒激光雷达数据，以验证理论结果，并产生准确的估计的多普勒激光雷达信号的大气去相关时间。 这对于评估多普勒激光雷达速度估计的准确性至关重要。 利用大气去相关计算的理论结果和实验测量结果，确定了多普勒激光雷达在不同波长和系统设计下的速度估计性能。 这项研究将有助于设计下一代的固态多普勒激光雷达遥感大气。 ***

9307233 Frehlich Research is proposed to analyze the performance of Doppler lidar for real system configurations, including the effects of refrctive turbulence and detector geometry. System performane is determined by the Signal to Noise Ratio(SNR) and the heterodyne efficiency. Analytic and numerical calculations of SNR and heterodyne efficiency for real and idealized Doppler lidar systems will be performed. The statistical behavior of estimates for heterodyne effciency will be determined for single element and multi-element detectors. The use of multi-element detectors for improving system performance when refractive turbulence is important will be investigated theoretically and with numerical simulations. The simulations will also produce accurate statistical description of real Doppler lidar signal fluctuations due to the random aerosol targets and refractive turbulence. The different physical mechanisms of Doppler lidar performance will be investigated and the regimes where simple analytic results are valid will be determined. The calculations will emphasize the shorter wavelenghts of solid state lidar systems. The effects of wind variations in the sensing volume of Doppler lidar will be determined theoretically for realistic atmospheric conditions. New data analysis techniques will be applied to Doppler lidar data to verify the theoretical results and produce accurate estimates of the atomospheric decorrelation time for Doppler lidar signals. This is essential for evaluating the accuracy of Doppler Lidar velocity estimates. The performace of Doppler Lidar velocity estimation for various wavelengths and system designs will be determined using the theoretical results of the atmospheric decorrelation calculations and the experimental measurements. This research will help design the next generation of solid state Doppler lidars for remote sensing of the atmosphere. ***