The GSSM will be the largest flat mirror in the world with the elliptical-plano figure 3.594 × 2.536 × 0.1 (m). The traditional evaluation method will not be suitable for such large aperture plan mirror surface. A non-correlation sub-aperture stitching method based on frequency domain was proposed, and the quality of its estimates was analyzed by the project team led by Prof. Xuejun Zhang and Dr. Fei Yang according to their previous work.
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