基于改进型Colpitts振荡器的超宽带混沌穿墙成像雷达

Through-wall imaging radar based on ultra-wideband chaotic signal using an improved Colpitts oscillator

提出了一种基于改进型Colpitts振荡器的超宽带混沌穿墙成像雷达,利用混沌相关法获得一维距离信息,通过天线扫描实现二维成像。基于时域有限差分法的数值电磁仿真和实验结果表明,该系统可对墙后人体目标进行探测,并可穿透0.2m厚的加气煤渣砖墙,对墙后的单、双金属球目标进行成像。系统的距离向和方位向分辨率分别为6cm和8cm。

We proposed an ultra-wideband chaotic through-wall imaging radar system based on an improved Colpitts oscillator . One-dimensional range information was obtained utilizing the chaotic correlation method ,and two-dimensional image was acquired through the antenna scanning .The numerical electromagnetic simulation using finite difference time domain demonstrated that the proposed chaotic radar can detect the human behind the wall .Meanwhile ,experimental results showed that this system can go through 0 .2 m thickness cinder brick wall to image the single and double metal targets .The down-range and cross-range resolu-tion is 6 cm and 8 cm ,respectively .