论文标题
来自多路径时间回声的3D成像
3D imaging from multipath temporal echoes
论文作者
论文摘要
Echo-Location是对成像和感测的广泛方法，包括人造雷达，激光雷达，声纳和动物导航。但是，基于Echo-Lococation的完整3D信息需要对场景进行某种形式的扫描，以便提供回声原点的空间位置。没有这些空间信息，3D中的成像对象是一项非常具有挑战性的任务，因为反检索问题是强烈的。在这里，我们表明，在返回回声中编码的时间信息在场景中多次反映的回声足以在3D中忠实地呈现图像。数值建模和信息理论观点证明了这一概念，并提供了对多径信息的作用的洞察力。我们通过使用射频和声波在封闭的环境中进行成像的个体来实验证明了这一概念。
Echo-location is a broad approach to imaging and sensing that includes both man-made RADAR, LIDAR, SONAR and also animal navigation. However, full 3D information based on echo-location requires some form of scanning of the scene in order to provide the spatial location of the echo origin-points. Without this spatial information, imaging objects in 3D is a very challenging task as the inverse retrieval problem is strongly ill-posed. Here, we show that the temporal information encoded in the return echoes that are reflected multiple times within a scene is sufficient to faithfully render an image in 3D. Numerical modelling and an information theoretic perspective prove the concept and provide insight into the role of the multipath information. We experimentally demonstrate the concept by using both radio-frequency and acoustic waves for imaging individuals moving in a closed environment.
