现代雷达2024，Vol.46Issue(7)：1-15,15.DOI:10.16592/j.cnki.1004-7859.2024.07.001
基于半波相消的旋转叶片微动回波时频分析
Time-frequency Analysis of Rotating Blades Micro-motion Echo Based on Half-wave Cancellation
摘要
Abstract
The rotation-induced micro-Doppler effect is common in radar detection scenarios,and the resulting micro-motion features are related to the geometric and kinematic parameters of the target.This paper comprehensively analyzes the formation mechanism of rotating blades micro-motion echo time-frequency features based on half-wave cancellation from the line integral model of micro-mo-tion echo.Firstly,the formation mechanism of the instantaneous frequency of rotating micro-motion is analyzed under the far-field condition based on half-wave cancellation,which explains the double-end effect of the time-frequency characteristics of rotating mi-cro-motion.Further,the half-wave cancellation analysis is extended to the near-field condition,and the effect of the double-ended re-gion and the specular scattering region of the time-frequency diagram accentuated under near-field conditions is explained.Moreover,for both far-field and near-field conditions,this paper gives a quantitative analytical calculation method for the time-frequency re-sults.This paper analyzes the time-frequency features of near-field and far-field from the perspectives of image shape and energy change,discusses the effects of different conditions and parameters on the shape and details of the time-frequency features,and uni-fies the near-field and far-field analyses based on the half-wave cancellation analysis,meanwhile,the line integral model and the lo-cal scattering model are linked.The simulation experiments verify the correctness of the proposed analytical methods.关键词
雷达/微动/微多普勒效应/时频分析/半波相消/远场和近场Key words
radar/micro-motion/micro-Doppler effect/time-frequency analysis/half-wave cancellation/far-field and near-field分类
电子信息工程引用本文复制引用
张炜,易建新,万显荣,李佳..基于半波相消的旋转叶片微动回波时频分析[J].现代雷达,2024,46(7):1-15,15.基金项目
国家自然科学基金资助项目(61931015,62071335,62250024) （61931015,62071335,62250024）
湖北省自然科学基金资助创新群体项目(2021CFA002) （2021CFA002）
中央高校自主科研项目(2042022dx0001) （2042022dx0001）
