AI 中文总结
研究提出利用瑞利散射激光雷达，通过差分探测器测量光束展宽估计涡耗散率来探测晴空湍流的方法，实验验证了相关模型有效性，该方法可使受限系统探测范围超30公里，提升了航空安全保障能力。
AI 中文摘要
飞行巡航高度大气中晴空湍流（CAT）的体积迅速增加，给民航带来日益严重的问题，且对航空安全的信心降低。由于晴空无可测量雷达回波，CAT的远程探测能力有限。激光雷达被提议作为一种可行的探测方法，已有多个系统得到验证，但探测范围有限。本文提出一种基于激光雷达的新型CAT探测方法，利用瑞利散射，通过差分探测器测量来量化光束展宽，从而估计涡耗散率（EDR）。还给出实验结果证明探测模拟中使用的光学效率模型的有效性。结果表明，在适度假设下，采用该方法的尺寸、重量和功率（SWAP）受限系统能在超过30公里的范围内探测到中度CAT，相比之前方法有显著范围提升，这一进展可在遇到湍流前保障机舱安全，降低乘客和空乘受伤风险。
英文摘要
The volume of clear-air turbulence (CAT) in the atmosphere at flight cruising altitudes is increasing rapidly, posing a growing problem for civil aviation and resulting in reduced confidence in aviation safety. There are limited remote detection capabilities for CAT, since clear air produces no measurable radar return. Lidar has been proposed as a viable detection methodology, and several systems have been demonstrated. However, these systems have to date demonstrated limited detection ranges of less than 15 km. In this work, we propose a novel lidar-based CAT detection methodology that uses Rayleigh scattering and relies on a differential detector measurement to quantify beam spread and thereby estimate the eddy dissipation rate (EDR), which is the international aircraft-independent metric for quantifying aviation turbulence strength. Additionally, we present experimental results demonstrating the validity of the optical efficiency model used in the detection simulations. We show that, under modest assumptions, a size, weight, and power (SWAP) constrained system that implements this method can detect moderate CAT at ranges in excess of 30 km, equating to two minutes of flight time for typical commercial aviation cruising speeds, which represents a substantial range improvement over prior approaches. This is an important advance because-for the first time-it potentially allows the cabin to be secured before the turbulence is encountered, reducing the injury risk to passengers and flight attendants.
