First video rate imagery from a 32-channel 22-GHz aperture synthesis passive millimetre wave imager

Neil A. Salmon; Rod Macpherson; Andy Harvey; Peter Hall; Steve Hayward; Peter Wilkinson; Chris Taylor

doi:10.1117/12.899564

5 October 2011 First video rate imagery from a 32-channel 22-GHz aperture synthesis passive millimetre wave imager

Neil A. Salmon, Rod Macpherson, Andy Harvey, Peter Hall, Steve Hayward, Peter Wilkinson, Chris Taylor

Proceedings Volume 8188, Millimetre Wave and Terahertz Sensors and Technology IV; 818805 (2011) https://doi.org/10.1117/12.899564
Event: SPIE Security + Defence, 2011, Prague, Czech Republic

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.

Citation Download Citation

Neil A. Salmon, Rod Macpherson, Andy Harvey, Peter Hall, Steve Hayward, Peter Wilkinson, and Chris Taylor "First video rate imagery from a 32-channel 22-GHz aperture synthesis passive millimetre wave imager", Proc. SPIE 8188, Millimetre Wave and Terahertz Sensors and Technology IV, 818805 (5 October 2011); https://doi.org/10.1117/12.899564

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