中南大学学报（自然科学版）2026，Vol.57Issue(4)：1602-1611,10.DOI:10.11817/j.issn.1672-7207.2026.04.012
一种基于MT-FCRA的高分辨率时频增强算法
A high-resolution time-frequency enhancement algorithm based on MT-FCRA
摘要
Abstract
In recent years,Doppler through-wall radar(TWR)technology has been widely applied in non-contact target localization and tracking.However,in complex multi-target scenarios,the received signals often contain crossing instantaneous frequency(FI)components,which interferes with accurate time-frequency feature extraction and reduces localization accuracy.To address this issue,a high-resolution and high-energy-concentration time-frequency enhancement method,i.e.,multi-target frequency-chirp rate analysis(MT-FCRA),was proposed to improve frequency extraction accuracy and component separability.The proposed method firstly utilized Bezier curves model to flexibly fit the complex time-frequency ridges of non-stationary signals to achieve high-precision FI estimation,and thereby provided crucial a priori information for subsequent signal processing.In addition,a novel analysis framework based on the frequency-chirp rate domain was constructed,where a local maximum synchrosqueezing operator was designed to redistribute the time-frequency coefficients in an orderly manner,forming the high time-frequency resolution time-frequency distribution.The results demonstrate that the proposed algorithm reduces the frequency estimation error by 61%,63%and 69%compared to short time Fourier transform(STFT),synchrosqueezing transform(SST)and multiple synchrosqueezing transform(MSST),respectively,and the localization accuracy is improved by 93%,88%and 93%,respectively.关键词
多普勒穿墙雷达/瞬时频率/时频增强/目标定位/局部最大同步压缩算子Key words
Doppler through-wall radar/instantaneous frequency/time-frequency enhancement/target localization/local maximum synchrosqueezing operator分类
信息技术与安全科学引用本文复制引用
唐博文,丁一鹏..一种基于MT-FCRA的高分辨率时频增强算法[J].中南大学学报（自然科学版）,2026,57(4):1602-1611,10.基金项目
中南大学中央高校基本科研基金资助项目(2025ZZTS0094)(Project(2025ZZTS0094)supported by the Fundamental Research Funds for Central Universities of Central South University) （2025ZZTS0094）
