Imaging experiments with a 340-GHz FMCW radar and frequency-diverse holograms

Samu Ville Pälli, Aleksi Tamminen, Paavo Hiltunen, Sazan Rexhepi, Marlene Bonmann, Tomas Bryllert, Duncan A. Robertson, Juha Ala-Laurinaho, Jan Stake, Zachary Taylor

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

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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.

Original languageEnglish
Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
EditorsAbigail S. Hedden, Gregory J. Mazzaro, Ann Marie Raynal
ISBN (Electronic)978-1-5106-6184-4
Publication statusPublished - 2023
MoE publication typeA4 Conference publication
EventRadar Sensor Technology - Orlando, United States
Duration: 1 May 20233 May 2023

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X


ConferenceRadar Sensor Technology
Country/TerritoryUnited States


  • FMCW radar
  • Hologram
  • imaging
  • neural network
  • submillimeter-wave


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