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Proceedings Paper

First video rate imagery from a 32-channel 22-GHz aperture synthesis passive millimetre wave imager
Author(s): Neil A. Salmon; Rod Macpherson; Andy Harvey; Peter Hall; Steve Hayward; Peter Wilkinson; Chris Taylor
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Paper Abstract

The first video rate imagery from a proof-of-concept 32-channel 22 GHz aperture synthesis imager is reported. This imager has been brought into operation over the first half of year 2011. Receiver noise temperatures have been measured to be ~453 K, close to original specifications, and the measured radiometric sensitivity agrees with the theoretical predictions for aperture synthesis imagers (2 K for a 40 ms integration time). The short term (few seconds) magnitude stability in the cross-correlations expressed as a fraction was measured to have a mean of 3.45×10-4 with a standard deviation of ~2.30×10-4, whilst the figure for the phase was found to have a mean of essentially zero with a standard deviation of 0.0181°. The susceptibility of the system to aliasing for point sources in the scene was examined and found to be well understood. The system was calibrated and security-relevant indoor near-field and out-door far-field imagery was created, at frame rates ranging from 1 to 200 frames per second. The results prove that an aperture synthesis imager can generate imagery in the near-field regime, successfully coping with the curved wave-fronts. The original objective of the project, to deliver a Technology Readiness Level (TRL) 4 laboratory demonstrator for aperture synthesis passive millimetre wave (PMMW) imaging, has been achieved. The project was co-funded by the Technology Strategy Board and the Royal Society of the United Kingdom.

Paper Details

Date Published: 5 October 2011
PDF: 12 pages
Proc. SPIE 8188, Millimetre Wave and Terahertz Sensors and Technology IV, 818805 (5 October 2011); doi: 10.1117/12.899564
Show Author Affiliations
Neil A. Salmon, QinetiQ Ltd. (United Kingdom)
Rod Macpherson, Radio Smith (United Kingdom)
Andy Harvey, Heriot-Watt Univ. (United Kingdom)
Peter Hall, Birmingham Univ. (United Kingdom)
Steve Hayward, QinetiQ Ltd. (United Kingdom)
Peter Wilkinson, The Univ. of Manchester (United Kingdom)
Chris Taylor, The Univ. of Manchester (United Kingdom)


Published in SPIE Proceedings Vol. 8188:
Millimetre Wave and Terahertz Sensors and Technology IV
Keith A. Krapels; Neil Anthony Salmon; Eddie Jacobs, Editor(s)

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