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Ultra-wideband radio tomographic imaging with resolution near the diffraction limit

机译：分辨率接近衍射极限的超宽带无线电层析成像

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摘要

The experimental ultra-wideband radio tomographic imagings inside and behind dielectric barriers with resolution near the diffraction limit are described. The problem is solved by the method of radio wave tomosynthesis using the theory of spatial spectra of the received signals. The ultra-wideband pulse sensing of the air—building structure medium, developed in Tomsk State University, are described. It has been shown that for the case of sensing with ultra-wideband pulses of 0.2 ns duration, the resolution is about 2 cm. The paper also shows the possibility of accelerating scanning of the investigated space through the use of the MIMO (timed or switched) antenna array technology. As in the timed mode the distance between the receiving and transmitting antennas varies from time step to time step, the algorithm of processing the data obtained from the array is to be modified. The modification itself is a nonlinear stretching of the received UWB signal in time. The signal transformation allows preparation of data for the above algorithm to receive three-dimensional images of the tested space. The paper presents the results of the processed experimental data which confirm the efficiency of the proposed method for MIMO arrays. The resulting image resolution is about 2 cm.
机译：描述了在电介质阻挡层内部和后面的实验性超宽带无线电层析成像，其分辨率接近衍射极限。该问题通过使用接收信号的空间频谱理论的无线电波断层合成方法解决。描述了托木斯克州立大学开发的空中建筑结构介质的超宽带脉冲传感。已经表明，对于持续时间为0.2ns的超宽带脉冲进行感应的情况，分辨率约为2 cm。该论文还显示了通过使用MIMO（定时或交换）天线阵列技术来加速扫描所研究空间的可能性。由于在定时模式下，接收天线和发射天线之间的距离随时间步长而变化，因此处理从阵列获得的数据的算法将被修改。修改本身是接收到的UWB信号在时间上的非线性扩展。信号转换允许为上述算法准备数据，以接收测试空间的三维图像。本文介绍了经过处理的实验数据，这些结果证实了所提出的MIMO阵列方法的效率。最终的图像分辨率约为2厘米。

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