相干多普勒测风激光雷达的频率估计算法  

Frequency estimation algorithm of coherent Doppler wind lidar

作　　者：左金辉 贾豫东[1] 张晓青[1] 李琛 ZUO Jin-hui;JIA Yu-dong;ZHANG Xiao-qing;LI Chen(Institute of Instrument Science and Photoelectric Engineering,Beijing Information Science&Technology University,Beijing 100192,China;Academy of Opto-Electronics,Chinese Academy of Sciences,Beijing 100094,China)

机构地区：[1]北京信息科技大学仪器科学与光电工程学院,北京100192 [2]中科院光电研究院,北京100094

出　　处：《激光与红外》2021年第5期554-558,共5页Laser & Infrared

基　　金：中国科学院战略性先导科技专项(A类)(No.XDA17010401)资助。

摘　　要：采用Welch谱估计结合自相关检测与能量重心法的频率估计算法,来提高淹没在噪声中的相干测风激光雷达多普勒信号频率估计的精度问题。通过将信号进行自相关预处理,然后由Welch谱分析获取功率谱进行频率的粗估计,最后由能量重心法进行频率校正来获取高精度的信号频率。仿真表明,本文算法有较低的平均绝对误差和均方根误差且性能稳定,并应用到相干测风激光雷达系统中与仿真一致。In order to improve the accuracy of Doppler signal frequency estimation of coherent wind lidar,Welch spectrum estimation combined with autocorrelation detection and energy barycenter method for frequency estimation is used in this paper.The signal is preprocessed by autocorrelation,then the power spectrum is obtained by Welch spectrum analysis,and the frequency is estimated roughly.Finally,the high-precision signal frequency is obtained by frequency correction by energy centro-baric method.Simulation results show that,this algorithm has lower mean absolute error and root mean square error and stable performance and is applied to the coherent wind lidar system,which is consistent with the simulation.

关 键 词：多普勒激光雷达 频率估计 自相关检测 WELCH法 能量重心法 

分 类 号：TN958.98[电子电信—信号与信息处理]