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Device for detecting objects borne by an individual

  • US 10,641,889 B2
  • Filed: 02/21/2017
  • Issued: 05/05/2020
  • Est. Priority Date: 02/24/2016
  • Status: Active Grant
First Claim
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1. A device for detecting objects borne by immobile or moving individuals, comprising:

  • first and second rotary antennas, each including at least two parallel rectilinear waveguides, one of the two waveguides being an emission guide that is configured to transmit an emission wave and the other of the two being a reception guide that is configured to transmit a reception wave, and a movable cylinder provided with a helicoidal slot rotatably movable about said waveguides, the waveguides being open facing an interior face of said movable cylinder, said interior face forming a microwave short-circuit in order to close said waveguides, a movable radiating source being located facing said waveguides subsequent to the rotational movement of said moveable cylinder inducing a movable emission and reception beam able to be oriented in a direction towards an individual;

    one radar configured to emit the emission wave, which is a continuous wave microwave signal, towards the emission guide of said first antenna and to receive signals captured by said movable beam from the waveguides of said second antenna, said received signals including a direct component I and a quadrature component;

    one stereoscopic video camera that is configured to be oriented in the direction towards the individual and able to record a clothing envelope of said individual, said clothing envelope being a reference surface defined by measurements of distances between an item of clothing of said individual and said device; and

    one processor configured to compute a synthetic aperture radar image of a portion of the body of said individual which is targeted by said radar and said video camera and who is possibly equipped with one or more objects, from signals received from said radar and from the clothing envelope recorded by said video camera,wherein said radar is configured to operate in a bi-static mode, said first rotary antenna realizing emission and said second rotary antenna being dedicated to reception.

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