电波科学学报2017，Vol.32Issue(1)：1-7,7.DOI:10.13443/j.cjors.2017020501
基于频域数据采样和时域信号同步的超宽带时间反转成像
Time reversal imaging based on frequency domain sampling and time domain synchronism
摘要
Abstract
An ultrawideband (UWB) time-reversal (TR) imaging method based on frequency domain sampling and time domain synchronism is presented.A pulse signal from a single transmitter is sent to the imaging domain, and the scattering fields are received by each element of the time-reversal mirror (TRM).A multistatic data matrix (MDM) at each element is formed by casting the fine and coarse frequency domain samples of the scattering information into a matrix form, called findividual requency-frequency MDM(FF-MDM).A full FF-MDM is constructed by stacking all the individual FF-MDM together, and the singular value decomposition (SVD) is applied to the full FF-MDM.The left singular vectors provide the spatial information for focusing the embedded targets or scatter centers, and different left singular vectors correspond to different targets.Each left singular vector at each TRM element is converted into the retransmitting pulse signal, and these retransmitted signals from each TRM element will achieve their waveform maximum values synchronically at the corresponding target position but non-synchronically at other positions.As a result, by defining the multiplication of these retransmitted signals as the final imaging function, good resolutions in both down-range and cross-range directions can be obtained.关键词
频域数据采样/奇异值分解/时间反转成像/时域信号同步Key words
frequency domain sampling/singular value decomposition/time-reversal imaging/time domain synchronism分类
信息技术与安全科学引用本文复制引用
李元奇,夏明耀..基于频域数据采样和时域信号同步的超宽带时间反转成像[J].电波科学学报,2017,32(1):1-7,7.基金项目
国家自然科学基金 (61531001,61271032) （61531001,61271032）
