摘要
研究了超宽带雷达在穿墙探测中的保真度,通过FDTD建模产生精确的穿墙雷达数据,利用后向投影算法对模拟得到的雷达数据进行成像。结果验证:超宽带雷达能准确探测和定位二维房间内的物体。成像算法中必须考虑墙体作用,电磁波在穿墙传播时发生折射、速度的改变、信号的衰减,这些将导致像的散焦、偏移,甚至可能产生虚像。运用迭代方法修正了成像算法中的时间因子,可有效地抑制像的偏移。
This paper studies the capability of ultra-wideband radar to provide surveillance through concrete walls. FDTD simulator is used to generate data of high fidelity through-wall radar. The raw data are transformed into radar imaging using back projection algorithm. It is shown that ultra-wideband radar can track and position targets inside a room with wood wall. Various effects of presence of the wall, such as refraction, change in speed, and attenuation, can defocus target images, displace targets from their true positions and possibly produce false targets. It is effective to restrain the derivation of image modifing the time in imaging algorithm by interation.
出处
《电波科学学报》
EI
CSCD
北大核心
2010年第3期569-573,共5页
Chinese Journal of Radio Science
基金
江苏省"青蓝工程"基金资助
关键词
超宽带雷达
穿墙
时域有限差分
后像投影算法
ultra-wideband radar
through-wall
finite-difference time
--domain （FDTD）
back projection（BP）
