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首页> 外文会议>3rd AIAA atmospheric space environments conference 2011 >Assessment of Pulsed Lidar Measurements of Aircraft Wakes Using a Lidar Simulator: Vortex Position Estimates for IGE, Linking, and Oblique Viewing, and Dependence of Vortex Lifetime on SNR
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Assessment of Pulsed Lidar Measurements of Aircraft Wakes Using a Lidar Simulator: Vortex Position Estimates for IGE, Linking, and Oblique Viewing, and Dependence of Vortex Lifetime on SNR

机译：使用激光雷达模拟器评估飞机苏醒的脉冲激光雷达测量结果：IGE，链接和斜视角的涡旋位置估计，以及涡旋寿命对SNR的依赖性

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A lidar simulator tool was developed to simulate realistic raw lidar signal data generated from a wake vortex velocity field as measured by the existing Lockheed Martin Coherent Technologies (LMCT) WindTracer~? pulsed lidar, currently used in the field to measure aircraft wake vortices. The raw lidar data is processed and the resulting product files are input into the existing LMCT Wake Vortex Processing Algorithm to estimate position and circulation strength versus wake age. The estimates from the Wake Vortex Processing Algorithm are then compared to truth data used to generate the raw lidar signal data. Accuracy of the Wake Vortex Processing Algorithm estimates of lateral and vertical position is evaluated by exercising the lidar simulator using input wake vortex fields based on analytical vortex models and 3-D Large Eddy Simulation computations for two aircraft types under IGE, OGE linking, and oblique viewing conditions. This study shows that the mean biases of the vortex position estimates for IGE and OGE linking vortices are small and similar to those for non-linking vortices in the OGE region reported in an earlier study1. The use of the lidar at oblique angles relative to the trailing line vortices does not introduce significant differences in the position biases. An analysis of the vortex lifetime estimates with SNR variations suggests avoiding lidar measurements for SNRs below 0 dB.
机译：开发了一种激光雷达模拟器工具，以模拟由尾波涡流速度场生成的真实原始激光雷达信号数据，该数据由现有的洛克希德·马丁公司的Coherent Technologies（LMCT）WindTracer？脉冲激光雷达，目前在现场用于测量飞机尾流涡流。处理原始激光雷达数据，并将生成的产品文件输入到现有的LMCT尾涡处理算法中，以估计位置和循环强度与尾流年龄之间的关系。然后将来自唤醒涡流处理算法的估计与用于生成原始激光雷达信号数据的真相数据进行比较。在基于IGE，OGE链接和斜向飞行的两种飞机类型的基础上，基于解析涡模型和3-D大涡模拟计算，通过使用输入的尾涡场对激光雷达模拟器进行练习，可以评估横向和垂直位置的尾涡处理算法的准确性。观看条件。这项研究表明，IGE和OGE链接涡旋的涡旋位置估计值的平均偏差很小，与早期研究中报道的OGE区域中非链接涡旋的偏斜相似。相对于尾迹涡流以倾斜角度使用激光雷达不会在位置偏差中引入明显差异。对具有SNR变化的涡流寿命估计值的分析表明，对于低于0 dB的SNR，避免进行激光雷达测量。

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