Abstract
Echo location is a broad approach to imaging and sensing that includes both manmade 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 three-dimensional (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 modeling 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.
- Received 11 November 2020
- Revised 11 December 2020
- Accepted 9 March 2021
DOI:https://doi.org/10.1103/PhysRevLett.126.174301
© 2021 American Physical Society
Physics Subject Headings (PhySH)
Focus
Multi-Echo Imaging
Published 30 April 2021
With a one-pixel detector and a pulsed emitting device, researchers are able to produce a 3D image of a room from multiple echoes.
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