Research on wavefront detection and correction algorithms for high-contrast imaging
Ultra-high contrast imaging in space is essential for the direct imaging detection of Earth-like planets,the a-chievement of which depends on the precise control of the optical wavefront by the space coronagraph system,and there-fore requires the development of specialized on-orbit algorithms dedicated to wavefront detection and correction.While such algorithms have been widely used in ground-based adaptive optics systems,but in space,they cannot be designed based on pure CPU computing due to the limitations of space CPU performance and selection.Based on the hybrid archi-tecture of FPGA and CPU,the wavefront correction is realized,which is capable of locking the high-contrast imaging dark region required for exoplanet detection while taking into account the hardware resources and computing accura-cy.The algorithm of the above hybrid architecture also has a significant speed advantage in large-scale adaptive optics systems,and the wavefront processing delay is shortened by 1281.826 μs for a 100 × 100 sub-aperture adaptive optics system,which can meet the demand for high-speed parallel computation of the adaptive optics systems,such as the Ex-AO,the GLAO,and the MCAO,which are equipped with the ground-based large-aperture telescopes.
adaptive opticshigh-contrast imagingwavefront detection and correctionFPGA
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