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Proceedings Paper

Passive mm-wave imaging using two scanning fan-beam antennas
Author(s): Yue Li; Greg Timms; John Archer; Grahame Rosolen; Juan Tello; Michael Brothers; Andrew Hellicar; Y. Jay Guo
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Paper Abstract

A prototype cross-correlating 190 GHz passive mm-wave imaging system has been developed. This system is based on the Mills Cross system used for radio astronomical imaging. It uses two pillbox antennas arranged in a T configuration. Each antenna generates a fan beam and the two fan beams are orthogonal to each other. By cross-correlating signals received from the two antennas, an output is obtained which is proportional to the millimeter-wave intensity radiated from the target at the intersection of the two fan beams. Beam scanning is generated by rotating a small sub-reflector inside each antenna. As a result, these relatively heavy antennas are stable during scanning and a high frame rate can be achieved. Another advantage of this approach is that only two receivers are required. The baseline (the displacement between phase centers of the two antennas) of this system is not zero, because the phase centers of the two antennas are not located at the same position. The baseline generates a fringe in the imaging system and its influence on the performance of the system is analyzed in this paper. The scanning speed of this system is also much faster than that of the Mills Cross imaging system and its influence on the resolution is also analyzed. It is found that the effect of the scanning speed is minimized when the beam scans along the equal-phase line of the fringe. This system can also be used as an active imaging system and this is discussed in another paper.

Paper Details

Date Published: 1 May 2007
PDF: 9 pages
Proc. SPIE 6548, Passive Millimeter-Wave Imaging Technology X, 65480E (1 May 2007); doi: 10.1117/12.718068
Show Author Affiliations
Yue Li, Commonwealth Scientific and Industrial Research Organization (Australia)
Greg Timms, Commonwealth Scientific and Industrial Research Organization (Australia)
John Archer, Commonwealth Scientific and Industrial Research Organization (Australia)
Grahame Rosolen, Commonwealth Scientific and Industrial Research Organization (Australia)
Juan Tello, Commonwealth Scientific and Industrial Research Organization (Australia)
Michael Brothers, Commonwealth Scientific and Industrial Research Organization (Australia)
Andrew Hellicar, Commonwealth Scientific and Industrial Research Organization (Australia)
Y. Jay Guo, Commonwealth Scientific and Industrial Research Organization (Australia)


Published in SPIE Proceedings Vol. 6548:
Passive Millimeter-Wave Imaging Technology X
Roger Appleby; David A. Wikner, Editor(s)

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