超宽带穿墙雷达三维快速成像算法

3-D Fast Imaging Algorithm for Ultra-wideBand Through-Wall Radar

超宽带穿墙雷达是一种能够隔墙探测和定位的新型实时成像雷达系统,在城区巷战、反恐斗争和人质救援中应用非常广泛。穿墙雷达对成像的实时性要求非常高,传统的成像算法已不能满足计算时间上的要求。本文将基于逆边界散射变换的快速成像算法应用到穿墙雷达系统中,利用FDTD数值仿真验证了对隐藏在墙后目标的三维成像结果,并分析了墙壁对目标定位误差的影响。研究表明,与传统的后向投影成像算法相比,基于逆边界散射变换的成像算法计算效率高,实时性好,且能对目标边界形状清晰成像。

The uhra-wideband through-wall radar （UWB TWR） is a novel real-time imaging radar system and can detect the suspicious objects without intrusion and surveil targets behind walls. Nowadays it can he widely used for urban-warfare, counter-terrorism and hostage rescue. Since TWR is a real time system with a strict requirement on processing time, conventional imaging algorithms cannot meet the demands of the calculation efficiency. Basic theories and implementations of the imaging algorithm based on the inverse boundary scattering transform （IBST）are presented. With finite difference time-domain（FDTD） numerical simulations, it is validated that the algorithm can be used to obtain three-dimensional（3-D） images of targets behind walls, and the position error caused of the presence of the wall is analyzed. Results show that the calculation efficiency by the proposed algorithm is much higher than that of the backprojection imaging algorithm, especially in 3-D imaging. And the target surface can be exactly reconstructed.