风云四号卫星闪电成像仪虚警滤除方法  

Filtering Algorithm for Nonlightning Events Using the FY-4 Lightning Mapping Imager

作　　者：高慧婷[1,2] 鲍书龙 梁华[1] 黄福祥[3] Gao Huiting;Bao Shulong;Liang Hua;Huang Fuxiang(Beijing Institute of Space Mechanics&Electricity,Beijing 100094,China;Beijing Key Laboratory of Advanced Optical Remote Sensing Technology,Beijing 100094,China;National Satellite Meteorological Center,China Meteorological Administration,Beijing 100081,China)

机构地区：[1]北京空间机电研究所,北京100094 [2]先进光学遥感技术北京市重点实验室,北京100094 [3]中国气象局国家卫星气象中心,北京100081

出　　处：《光学学报》2021年第9期63-71,共9页Acta Optica Sinica

基　　金：国家自然科学基金(41871278);科技部地导专项(2018YFB0504801)。

摘　　要：风云四号闪电成像仪(LMI)在轨数据分析结果表明,虚假闪电事件包括鬼像噪声、高能粒子轨迹噪声和散粒噪声。为了提高闪电探测性能,在深入分析虚假事件特性的基础上,分别提出了基于空间-能量相关性的鬼像滤除方法、基于Hough直线检测的高能粒子轨迹噪声滤除方法、基于时空相关聚类的散粒噪声剔除方法,并形成闪电虚警滤除处理系统方法。为了验证虚警滤除算法性能,对云南和海南的两次典型雷暴数据进行处理,并与地基网探测结果进行比对,结果表明,所提算法处理后的闪电事件分布特性与地基探测结果基本一致,验证了风云四号闪电成像仪对雷电变化过程的持续跟踪性能。By analyzing the on-board lightning data of the FY-4 lightning mapping imager(LMI),there are three types of nonlightning events:ghost noise,high-energy-particle-trajectory noise,and shot noise.To improve the performance of lightning detection,based on an in-depth analysis of the characteristics of false events,the ghost-image-filtering method based on spatial energy correlation,the high-energy-particle-trajectory noise-filtering method based on Hough linear detection,and the shot-noise-filtering method based on spatiotemporal correlation clustering are proposed,and the lightning false-alarm-filtering-processing system method is performed.To test the performance of the false-alarm-filtering algorithm,the lightning-filter algorithm is applied to process two thunderstorms in Yunnan and Hainan provinces.We compare the lightning data obtained by the LMI with those obtained by ground-based network.The results show that the distribution characteristics of lightning events processed by the proposed algorithm are consistent with the ground-based detection results,which verifies the continuous tracking performance of the FY-4 lightning mapping imager for the lightning change process.

关 键 词：成像系统 闪电成像仪 虚假事件 滤波 聚类 

分 类 号：TP751[自动化与计算机技术—检测技术与自动化装置]