Continuous-capture microwave imaging

Fabio C. S. Silva (), Anthony B. Kos, Grace E. Antonucci, Jason B. Coder, Craig W. Nelson and Archita Hati
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Fabio C. S. Silva: National Institute of Standards and Technology
Anthony B. Kos: National Institute of Standards and Technology
Grace E. Antonucci: National Institute of Standards and Technology
Jason B. Coder: National Institute of Standards and Technology
Craig W. Nelson: National Institute of Standards and Technology
Archita Hati: National Institute of Standards and Technology

Nature Communications, 2021, vol. 12, issue 1, 1-8

Abstract: Abstract Light-in-flight sensing has emerged as a promising technique in image reconstruction applications at various wavelengths. We report a microwave imaging system that uses an array of transmitters and a single receiver operating in continuous transmit-receive mode. Captures take a few microseconds and the corresponding images cover a spatial range of tens of square meters with spatial resolution of 0.1 meter. The images are the result of a dot product between a reconstruction matrix and the captured signal with no prior knowledge of the scene. The reconstruction matrix uses an engineered electromagnetic field mask to create unique random time patterns at every point in the scene and correlates it with the captured signal to determine the corresponding voxel value. We report the operation of the system through simulations and experiment in a laboratory scene. We demonstrate through-wall real-time imaging, tracking, and observe second-order images from specular reflections.

Date: 2021
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DOI: 10.1038/s41467-021-24219-0

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