时域波束形成在超宽带穿墙成像雷达中的应用
doi: 10.3724/SP.J.1146.2006.01850
The Application of Time Domain Beamforming to Ultra-wideband Through-wall Imaging Radar
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摘要: 超宽带穿墙成像雷达作为一种能够隔墙探测和定位的新型雷达系统,在很多领域得到应用。该文提出利用时域波束形成对穿墙雷达进行成像的方法。电磁波穿墙传播时产生速度变化、衰减和折射等现象。该文在电磁波穿墙传播的折射模型上用解析的方法计算电磁波的传播时间,在时域波束形成成像算法中考虑了墙体对电磁波的影响,并用FDTD模拟对成像方法进行验证。最后定性分析了墙体厚度、介电常数估计误差对成像的影响。Abstract: Ultra-WideBand (UWB) through-wall imaging radar is a promising technique and can be widely used for detecting and locating moving people through obstacles. In this paper, time domain beamforming method is presented for UWB through-wall imaging applications. The propagating wave slows down, encounters refraction and is attenuated as it passes through the wall. Firstly, the travel time is calculated from the antenna to the target in closed form based on the refraction model. Next, the beamformer design is presented, which incorporates the wall effects. Finally, Finite-Difference Time-Domain is used to demonstrate the efficacy of beamforming method and the impact of incorrect estimates of the wall thickness and dielectric constant on performance is also considered.
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