希尔伯特-黄变换
激光雷达
信号(编程语言)
计算机科学
干扰(通信)
希尔伯特变换
时频分析
希尔伯特谱分析
信号处理
算法
遥感
雷达
计算机视觉
电信
光谱密度
地质学
频道(广播)
滤波器(信号处理)
程序设计语言
摘要
This letter proposes an improved method to estimate intermediate frequency (IF) signal frequency of FMCW LIDAR. This method extracts characteristics of IF signal from FMCW LIDAR and optimizes the selection and solution of intrinsic mode functions (IMFs). The main contribution of the proposed solution, namely refined modal variation Hilbert-Huang transform (RMV-HHT), relies on the extraction of characteristics from the specific IMF of the IF signal decomposed by variational mode decomposition (VMD). Considering non-stationary interference and environmental noise, the RMVHHT and four competitive methods are evaluated. Calculating distance after signal processed by different methods, the RMV-HHT achieves the highest SNR and lowest mean absolute error at different distances. Results demonstrate that the proposed RMV-HHT method is superior to traditional methods in FMCW LIDAR signal processing.
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