Experimental results and simulations from aperture synthesis three-dimensional radiometric imaging

Salmon, NA ORCID: https://orcid.org/0000-0003-4786-7130 (2016) Experimental results and simulations from aperture synthesis three-dimensional radiometric imaging. In: SPIE Security and Defence, 26 September 2016 - 29 September 2019, Edinburgh, Scotland.

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Abstract

© 2016 SPIE.This paper presents the theory and algorithm of how a three-dimensional (3D) image can be generated using crosscorrelations of radiometric emission from a source measured using antennas in the near field. An example of how the algorithm is used to create 3D images of emission measured from a noise source is presented, indicating the presence of Fresnel noise and aliasing in the experimental data when the source is moved away from the phase centre. Simulations are presented which reproduce the Fresnel noise as generated by a 3x3x3 array of point sources located at the centre of a 2 metre diameter array of antennas representing a security screening portal. Two methods of reducing the Fresnel noise are presented: 1) a software method which makes successive more accurate estimates of the locations and intensities of sources; 2) a hardware method which reduces the coherence length of the radiation by increasing the radiation bandwidth.