辽宁工程技术大学学报（自然科学版）2025，Vol.44Issue(3)：378-384,7.DOI:10.11956/j.issn.1008-0562.20240387
相干多普勒激光雷达微弱回波综合频率估计算法
A comprehensive frequency estimation algorithm for weak echoes in coherent Doppler lidar
摘要
Abstract
In order to solve the problem of low accuracy and low detection probability of spectrum information extraction of weak echo signal of coherent Doppler lidar,a spectrum estimation algorithm combining coherent accumulation,autocorrelation operation,Welch power spectrum estimation and energy barycenter method of signal is proposed based on the time-frequency domain analysis method of traditional signal.The simulation results show that compared with the energy center of gravity method and the ratio method,the average frequency estimation accuracy of the algorithm is increased by 43%and 46%respectively,and the lidar detection probability is the highest under the same conditions.The simulation results verify that the proposed algorithm can improve the frequency estimation performance of the weak signal of the coherent Doppler lidar,improve the lidar speed measurement accuracy and detection distance,and the detection ability is more stable.The algorithm is applied to the echo signal of 1 550 nm coherent Doppler lidar.The results show that the proposed algorithm effectively improves the velocity measurement accuracy of the lidar.关键词
相干多普勒激光雷达/频率估计/能量重心法/Welch谱估计/自相关运算/微弱信号/回波信号Key words
coherent Doppler lidar/frequency estimation/energy barycenter method/Welch spectrum estimation/autocorrelation operation/weak signal/echo signal分类
信息技术与安全科学引用本文复制引用
邢晓晴,陆威,范红云,邢志伟..相干多普勒激光雷达微弱回波综合频率估计算法[J].辽宁工程技术大学学报（自然科学版）,2025,44(3):378-384,7.基金项目
国家自然科学基金项目(U2333205) （U2333205）
中央高校基本科研业务费专项资金资助项目(24CAFUC03020) （24CAFUC03020）
