用深度学习提升激光雷达风场探测精度,突破高空信号弱导致的测量瓶颈。
LWFNet: Coherent Doppler Wind Lidar-Based Network for Wind Field Retrieval
- 基于Transformer与科尔莫戈罗夫-阿诺德网络构建风场反演神经网络
- 在高空弱信号区域实现超精度风速估计,超越标注数据精度
- 适用于高分辨率大气风场探测,推动气象监测智能化
准确获取对流层内风场信息对于大气动力学研究和极端天气预报至关重要。相干多普勒激光雷达(CDWL)是实现高时空分辨率风场探测的首选技术。然而,由于相干探测依赖气溶胶粒子引起的米散射,高空区域回波信号强度显著降低,传统方法如谱中心估计算法在此类区域常无法获得可信、准确的风速反演结果。为此,本文提出LWFNet——首个基于激光雷达的风场反演神经网络,融合Transformer与科尔莫戈罗夫-阿诺德网络架构。模型仅使用传统算法生成的目标进行训练,并以探空仪数据作为测试评估的真实值。实验表明,LWFNet不仅扩展了最大风场探测高度,且反演精度超越标注数据,展现出超出预期的超精度现象。通过分析潜在成因,揭示其在复杂信号中隐含特征提取的优势。与现有先进模型对比,LWFNet在高分辨率风场反演中表现更优,为该领域树立新基准,推动深度学习在气象探测中的应用发展。
原文摘要 · Abstract (English)
Accurate detection of wind fields within the troposphere is essential for atmospheric dynamics research and plays a crucial role in extreme weather forecasting. Coherent Doppler wind lidar (CDWL) is widely regarded as the most suitable technique for high spatial and temporal resolution wind field detection. However, since coherent detection relies heavily on the concentration of aerosol particles, which cause Mie scattering, the received backscattering lidar signal exhibits significantly low intensity at high altitudes. As a result, conventional methods, such as spectral centroid estimation, often fail to produce credible and accurate wind retrieval results in these regions. To address this issue, we propose LWFNet, the first Lidar-based Wind Field (WF) retrieval neural Network, built upon Transformer and the Kolmogorov-Arnold network. Our model is trained solely on targets derived from the traditional wind retrieval algorithm and utilizes radiosonde measurements as the ground truth for test results evaluation. Experimental results demonstrate that LWFNet not only extends the maximum wind field detection range but also produces more accurate results, exhibiting a level of precision that surpasses the labeled targets. This phenomenon, which we refer to as super-accuracy, is explored by investigating the potential underlying factors that contribute to this intriguing occurrence. In addition, we compare the performance of LWFNet with other state-of-the-art (SOTA) models, highlighting its superior effectiveness and capability in high-resolution wind retrieval. LWFNet demonstrates remarkable performance in lidar-based wind field retrieval, setting a benchmark for future research and advancing the development of deep learning models in this domain.
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