Performance Analysis of Doppler Lidar

多普勒激光雷达性能分析

• 批准号: 9307233
• 负责人: Rod Frehlich
• 金额: $ 23.01万
• 依托单位: University of Colorado at Boulder
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1993
• 资助国家: 美国
• 起止时间: 1993-09-15 至 1997-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9307233&HistoricalAwards=false
• 关键词: Performance; Analysis; Doppler; Lidar

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. ***

9307233 Frehlich研究提出了多普勒激光雷达在实际系统配置下的性能分析，包括折射率湍流和探测器几何形状的影响。系统性能由信噪比和外差效率决定。分析和数值计算了真实和理想多普勒激光雷达系统的信噪比和外差效率。对于单元素和多元素探测器，外差效率估计的统计行为将被确定。本文将从理论和数值模拟两方面研究多元素探测器在重要的折射湍流中改善系统性能的作用。模拟还将对随机气溶胶目标和折射湍流引起的真实多普勒激光雷达信号波动产生准确的统计描述。将研究多普勒激光雷达性能的不同物理机制，并确定简单分析结果有效的机制。计算将着重于固态激光雷达系统的短波长。在实际大气条件下，将从理论上确定风的变化对多普勒激光雷达传感体积的影响。新的数据分析技术将应用于多普勒激光雷达数据，以验证理论结果，并对多普勒激光雷达信号的大气去相关时间进行准确估计。这对于评估多普勒激光雷达速度估计的准确性至关重要。利用大气解相关计算和实验测量的理论结果，确定了多普勒激光雷达速度估计在不同波长和系统设计下的性能。这项研究将有助于设计用于大气遥感的下一代固态多普勒激光雷达。* * *