Imaging experiments with a 340-GHz FMCW radar and frequency-diverse holograms
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Date
2023
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en
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Proceedings of SPIE - The International Society for Optical Engineering, Volume 12535
Abstract
We present recent developments of a standoff imaging system based on a frequency-diverse phase hologram and deep neural networks. The single-pixel imaging system operates in a monostatic configuration consisting of a 340-GHz FMCW radar and a frequency-diverse phase hologram to interrogate the radar down range direction with spatially varying, frequency-dependent field patterns. The measured back-reflected signal contains spatial reflectivity information from the target, and the fast chirp rate of the radar enables real-time imaging performance. Together with simultaneously acquired visible-light images, a deep neural network integrated into the submillimeter-wave data readout electronics can map the received signal onto a 2D image without mechanical or active electrical beam scanning. In experiments, we have collected submillimeter-wave and visible-light data of a moving target in the region of interest with a 60-Hz frame rate. The results suggest that the system can image the moving target with a resolution comparable to the theoretical diffraction limit. The minimal hardware complexity and good imaging performance of the demonstrated computational submillimeter-wave imaging system support its potential as a cost-effective and easily deployable solution for various imaging applications.Description
Funding Information: This work is supported by the Business Finland research to business project R2B-MilliScan. Aalto Design Factory is thanked for the manufacturing of the quasioptics. Mr. Markus Grönholm from Alshain Oy is thanked for manufacturing the hologram and radar software development. Publisher Copyright: © 2023 SPIE.
Keywords
FMCW radar, Hologram, imaging, neural network, submillimeter-wave
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Citation
Pälli, S V, Tamminen, A, Hiltunen, P, Rexhepi, S, Bonmann, M, Bryllert, T, Robertson, D A, Ala-Laurinaho, J, Stake, J & Taylor, Z 2023, Imaging experiments with a 340-GHz FMCW radar and frequency-diverse holograms . in A S Hedden, G J Mazzaro & A M Raynal (eds), Radar Sensor Technology XXVII ., 125350M, Proceedings of SPIE - The International Society for Optical Engineering, vol. 12535, SPIE, Radar Sensor Technology, Orlando, Florida, United States, 01/05/2023 . https://doi.org/10.1117/12.2663757
