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Method for stand off inspection of target in monitored space

  • US 8,670,021 B2
  • Filed: 02/23/2012
  • Issued: 03/11/2014
  • Est. Priority Date: 07/19/2011
  • Status: Active Grant
First Claim
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1. A method for unveiling hidden dielectric objects in an interrogated area, comprising:

  • recording a 3D microwave and a 3D optical range images of an interrogated scene at the same time moment, digitizing all images and overlapping them in one common coordinate system;

    determining a distance between the 3D microwave and 3D optical images, and concluding the absence of hidden dielectric object where the optical distance is less than a threshold value, the distance being determined via calculating a dielectric permittivity constant ∈

    ;

    further comprising concluding the presence of hidden dielectric objects if cavities are observed in the three-dimensional microwave image, where the distance is more than a threshold value l, and the cavities depth h is greater than a depth threshold
    h0=l0(∈

    1/2

    1)/∈

    1/2).

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