Simulation and Analysis of Human Micro-Dopplers in Through-Wall Environments
Simulation and Analysis of Human Micro-Dopplers in Through-Wall Environments
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DOI：
10.1109/tgrs.2009.2037219
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发表时间：
2010-04-01
影响因子：
8.2
通讯作者：
Ling, Hao
中科院分区：
文献类型：
--
作者：
Ram, Shobha Sundar;Christianson, Craig;Ling, Hao
我们提出了一种模拟方法，用于生成微多普勒雷达签名的人在墙后移动。该方法结合了连续性为基础的建模的人与有限差分时域（FDTD）模拟的墙壁。从计算机动画数据生成人的真实运动。时变人体雷达散射截面的仿真使用连续的预测技术。然后通过人体模拟模型与FDTD产生的穿墙传播数据的混合，模拟墙后人体的散射回波。由此产生的模拟器是用来研究均匀和不均匀类型的墙壁对人体微多普勒的影响。据发现，虽然通过墙壁传播影响的幅度响应的多普勒频谱图的衰减和衰落的形式，它只引入非常小的失真的实际多普勒频率从身体部位。使用多普勒雷达收集的测量数据以及对墙壁引起的折射和多路径进行的点散射体分析证实了这一点。
We present a simulation methodology for generating micro-Doppler radar signatures of humans moving behind walls. The method combines primitive-based modeling of humans with finite-difference time-domain (FDTD) simulation of walls. Realistic motions of humans are generated from computer animation data. The time-varying human radar cross section is simulated using the primitive-based prediction technique. The scattered returns of humans behind walls are then simulated by a hybrid of the human simulation model with the through-wall propagation data generated from FDTD. The resulting simulator is used to investigate the effects of walls of both homogeneous and inhomogeneous types on human micro-Dopplers. It is found that while through-wall propagation affects the magnitude response of the Doppler spectrogram in the form of attenuation and fading, it only introduces very minor distortions on the actual Doppler frequencies from the body parts. This is corroborated by measurement data collected using a Doppler radar, as well as by a point-scatterer analysis of refraction and multipath introduced by walls.