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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...
In this letter, a novel frequency-domain imaging method is proposed for a single-input–multiple-output array, which avoids the frequency-domain interpolation. This method transforms the measurements into the wavenumber domain for compensation. The spectrum data at each frequency are proved to be the Fourier transform of the phase-modulated reflectivity function; therefore, a subimage at a specific...
Near-field cross section imaging is an important issue in the area of near filed radar imaging. A conventional algorithm for cross section imaging is FFT after interpolation. It is intuitionistic and relatively fast. However the interpolation accuracy significantly affects the image quality especially when the data is highly curving in the case of wideband millimeter wave. To solve this problem, we...
The application of stepped frequency waveform in synthetic aperture radar (SAR) can greatly reduce the hardware requirements, while obtaining high range resolution. However, the range difference within a single stepped-frequency burst may cause the range profile shift and defocus, which seriously affect the quality of SAR image. Traditional compensation methods for this problem are rather complicated...
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