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The paper proposes a fast and interpolation-free method for near-field 3-D radar imaging. The scattered data are measured on 2-D planar antenna array with wideband stepped frequency signal. The near-field 3-D imaging procedure is indeed a nonuniform summation problem. Different from the conventional interpolation fast Fourier transform (FFT) method, the proposed method regards the imaging procedure...
Experimental evaluation of a Ground Penetrating Radar (GPR) system is presented. The method is based on an Underground-SAR imaging algorithm that takes into account the complex permittivity of the soil to compensate for the slower wave propagation so that buried objects are imaged at the correct depth. The proposed GPR imaging system is devoted to operate in C band, from 3.5 to 5.5 GHz, in order to...
We demonstrate a frequency-diverse imaging system using an air-filled cavity-backed antenna as a transceiver (cavity-to-cavity system layout) for the K-band (17.5–26.5 GHz) frequency regime. Leveraging the computational imaging concept, the frequency-diversity enables imaging in an all-electronic manner, without the need for mechanical raster scanning or active circuit components, minimizing the data...
This paper deals with the polarization aspect in 3D inverse scattering. The vectorial information contained in the scattering matrix is often under-exploited in quantitative inverse scattering problems even if it has been expensively studied in radar processing. In this work, we present a study of the influence of the polarization state of the electromagnetic wave on the reconstructed permittivity...
It is important to know which parts of an inspection domain could be suitably reconstructed in through the wall imaging (TWI). It is also of interest to find a frequency range for which a reconstruction algorithm is efficient. For these purposes, a quantitative investigation of the coverage area and frequency bandwidth of the imaging setup is introduced. The imaging process is based on the linear...
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