The limited spatial sampling rates of conventional Shack–Hartmann wavefront sensors (SHWFSs) make them unable to sense higher-order wavefront distortion. In this study, by etching a known phase on ...

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Generally, the azimuth resolution of radar is the 3dB beamwidth. To improve the azimuth resolution without changing the antenna aperture, we propose a high-resolution imaging method based on nonlinear ...