Department of Applied Physics, The Hebrew University of Jerusalem, 9190401, Jerusalem, Israel.
Sci Rep. 2023 Mar 27;13(1):4952. doi: 10.1038/s41598-023-31490-2.
Non-line-of-sight (NLoS) imaging is an important challenge in many fields ranging from autonomous vehicles and smart cities to defense applications. Several recent works in optics and acoustics tackle the challenge of imaging targets hidden from view (e.g. placed around a corner) by measuring time-of-flight information using active SONAR/LiDAR techniques, effectively mapping the Green functions (impulse responses) from several controlled sources to an array of detectors. Here, leveraging passive correlations-based imaging techniques (also termed 'acoustic daylight imaging'), we study the possibility of acoustic NLoS target localization around a corner without the use of controlled active sources. We demonstrate localization and tracking of a human subject hidden around a corner in a reverberating room using Green functions retrieved from correlations of broadband uncontrolled noise sources recorded by multiple detectors. Our results demonstrate that for NLoS localization controlled active sources can be replaced by passive detectors as long as a sufficiently broadband noise is present in the scene.
非视距 (NLoS) 成像是许多领域的一个重要挑战，包括自动驾驶汽车、智能城市和国防应用。最近在光学和声学领域的几项工作通过使用主动声纳/激光雷达技术测量飞行时间信息来应对隐藏在视线之外（例如放置在拐角处）的目标成像的挑战，有效地将来自多个受控源的格林函数（脉冲响应）映射到探测器阵列。在这里，我们利用基于被动相关的成像技术（也称为“声学日光成像”），研究了在不使用受控有源源的情况下在拐角处进行声纳 NLoS 目标定位的可能性。我们使用从多个探测器记录的宽带非受控噪声源的相关中检索到的格林函数，演示了在混响室中隐藏在拐角处的人体目标的定位和跟踪。我们的结果表明，对于 NLoS 定位，只要场景中存在足够宽带的噪声，就可以用无源探测器代替有源控制源。
