Abstract
ABSTRACTFor an aperture synthesis radiometer, sidelobe artefact is an important problem in image reconstruction from finite visibility samples, especially, when there are strong point sources in the observed scene. The conventional Fourier inversion method with fixed window reduces sidelobe artefacts only at the expense of worsened mainlobe resolution. An adaptive beamforming method is developed in this letter as a means of reducing sidelobe artefacts while preserving the mainlobe resolution. The main idea behind this method is to form a scene-dependent weighting function for visibilities to minimize the energy received by the sidelobes. Numerical studies show that the proposed method has an improvement in reducing the sidelobe artefacts compared with the Fourier inversion method.
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