利用障碍物边缘衍射声波，实现无反射面的三维声源定位。
Passive acoustic non-line-of-sight localization without a relay surface
- 通过障碍物边缘的声波衍射实现非视距定位
- 在门洞和凸角场景下分别设计虚拟阵列与频谱特征方法
- 无需可见反射面，适用于传统方法失效的复杂环境
传统非视距（NLOS）声源检测依赖于可见反射面（如地板、墙壁）产生的间接信号。本文提出一种基于障碍物边缘衍射的三维声源定位方法，解决无反射面时的定位难题。针对门洞和凸角两种典型场景，分别设计方案：在门洞场景中，利用门的两个边缘作为虚拟接收阵列；在凸角场景中，借鉴人耳声源定位的头相关传输函数（HRTF）思想，提取刀刃衍射的频谱特征。两种方法均利用刀刃衍射扩展非视距声学感知能力，在常规反射面受限环境中仍可实现有效定位。
原文摘要 · Abstract (English)
The detection and localization of a source hidden outside the Line-of-Sight (LOS) traditionally rely on the acquisition of indirect signals, such as those reflected from visible relay surfaces such as floors or walls. These reflected signals are then utilized to reconstruct the obscured scene. In this study, we present an approach that utilize signals diffracted from an edge of an obstacle to achieve three-dimensional (3D) localization of an acoustic point source situated outside the LOS. We address two scenarios - a doorway and a convex corner - and propose a localization method for each of them. For the first scenario, we utilize the two edges of the door as virtual detector arrays. For the second scenario, we exploit the spectral signature of a knife-edge diffraction, inspired by the human perception of sound location by the head-related transfer function (HRTF). In both methods, knife-edge diffraction is utilized to extend the capabilities of non-line-of-sight (NLOS) acoustic sensing, enabling localization in environments where conventional relay-surface based approaches may be limited.
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