| 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 |
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| 引用本文： | 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. DOI: 10.13443/j.cjors.2017020501 |
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| 作者姓名： | 李元奇 夏明耀 |
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| 作者单位： | 1.电子科技大学电子工程学院, 成都 611731 |
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| 摘 要： | 提出一种基于频域数据取样和时域信号同步的超宽带（Ultrawideband，UWB）时间反转（Time-Reversal，TR）成像方法.单个发射机发射UWB脉冲信号到探测区域，时间反转镜（Time Reversal Mirror，TRM）的每个天线单元对散射信号进行细频和粗频数据采样，得到各自单元的频率-频率-多站数据矩阵（individual-FF-MDM）.把所有单元的该矩阵堆砌起来，形成一个全体单元的频率-频率-多站数据矩阵（full-FF-MDM），并对full-FF-MDM进行奇异值分解（Singular Value Decomposition，SVD），得到耦合了目标位置信息的左奇异值向量.将每一个左奇异值向量变换成时域脉冲回传辐射，则来自TRM各单元的回传辐射信号在相应目标处同时到达波形的最大值，而在非该目标处则不能同时达到最大值.于是，定义各单元的回传信号乘积作为目标成像函数，可获得良好的横向和纵向分辨率.
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| 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 |
| 收稿时间： | 2017-02-05 |
Time reversal imaging based on frequency domain sampling and time domain synchronism |
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| LI Yuanqi,XIA Mingyao. Time reversal imaging based on frequency domain sampling and time domain synchronism[J]. Chinese Journal of Radio Science, 2017, 32(1): 1-7. DOI: 10.13443/j.cjors.2017020501 |
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| Authors: | LI Yuanqi XIA Mingyao |
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| Affiliation: | 1.University of Electronic Science and Technology of China, Chengdu 611731, China2.Peking University, Beijing 100871, China |
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| 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. |
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| Keywords: | frequency domain sampling singular value decomposition time-reversal imaging time domain synchronism |
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