基于穿墙雷达的虚拟多视角成像

Virtual multi-views method for through wall radar imaging

由于墙体及室内目标的存在,穿墙雷达回波信号中包含许多多径分量,导致在成像后图像中存在许多幻影分量.在传统的穿墙雷达成像及预处理中,将多径分量视为杂波和干扰分量,并提出许多方法来抑制多径分量.基于多径分量提供了同一目标不同观测视角的优势,提出了一种基于室内电波传播模型的多径利用方法.该方法在后向投影成像方法的基础上,利用双圆解析表达式方法识别图像中幻影的位置信息,将幻影与目标相关联,并结合指数加权函数的方法,实现目标的虚拟多视角成像,仿真实测结果验证了该方法的有效性.

Existence of targets inside buildings or rooms introduces multipath in the radar return,which results in false targets in the original beamformed image.In the traditional processing of through-wall radar scattered data,the multipath return was regarded as clutter and many methods were proposed for suppressing these interference.As each multipath return provides some additional information about the target,we develop a multipath exploitation technique based on the indoor radio propagation revised model and multiple-path scattering model.Based on the back propagation imaging algorithm,a method for localizing the focused multipath ghosts is provided,then we introduce the two-dimensional exponential weighting function to achieve the virtual multi-views image.Simulations and experimental data are used to validate the proposed algorithm.