Due to the diffraction limit of optical system and detector fabrication technology, super-resolution imaging has been an important means to achieve high spatial resolution in remote sensing. One super-resolution imaging method based on sub-pixels is explored in the paper, the mechanism and image reconstruction of the method are mainly studied. Taking one remote sensor as a sample, registration accuracy of homonymous points, which matters to super-resolution image reconstruction, and its influencing factors, are analyzed, showing that, the image resolution can be improved about 1.5 times when the registration accuracy of homonymous points is better than 0.12 pixels.
For the requirement of the great breadth and high spectral resolution of hyperspectral sensor, Offner spectral imaging system, which can be divided into two types: prisms and gratings, is designed, and methods to filter secondary spectrum are also discussed. Basic the design, an Offner spectral imaging system with gratings is developed and tested. The research shows that, compared to prisms, Offner spectral imaging system with gratings not only have high spectral resolution, large flat field, little spectral smile and keystone, but also can satisfy the requirement of hyperspectral sensor that the system can be mounted on small or mini satellites.
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