KEYWORDS: Space telescopes, Optical instrument design, Mirrors, Optical design, Telescopes, Aerospace engineering, Space robots, Space operations, Optical fabrication, James Webb Space Telescope
On-orbit Assembling Space Telescope (OAST) technology, which was firstly presented by NASA around early 2000s, is one of the most feasible paths to the implement of 10m-class aperture large scale space telescope. Unlike traditional monolithic aperture telescope (like HST) or deployable space telescope (like JWST), OAST is modularly designed, modularly manufactured and modularly launched, the telescope modules are assembled and co-phased to diffraction limit in spatial environment. Considering the development of OAST involves multiple interfaces and new subsystems, on-orbit assembling and aligning procedure, the top-level design methods and considerations are quite different from monolithic space telescopes. this article introduces and discusses several op-level design consideration including optical and mechanical structure, on-orbit assembling and aligning method, and on-orbit testbed developing method.
Segmented mirror space telescopes have many advantages in both observation capacity and engineering feasibility. However, the alignment procedures for them are particularly complicated. Meanwhile, global alignment is one of the most important steps, in which the misalignments of each segment should be determined and corrected before image stacking is performed. Therefore, segment-level wavefront sensing is needed in this process. At present, traditional iterative phase retrieval algorithm is used to recover the segmented-level wavefront phase. However, the efficiency of this algorithm is comparatively low, especially given that there is an array of segment-level wavefront maps that need to be recovered. In addition, the magnitudes of misalignments are comparatively large in this stage and the iterative phase retrieval algorithm can be trapped in a local minimum for large-scale wavefront sensing. An analytic approach is proposed to estimate the segment-level wavefront aberrations based on the analysis of the geometrical features of one defocused point spread function (PSF) image. Meanwhile, some aberration properties of the misaligned system are also utilized. Simulations and an experiment are performed to verify the effectiveness of the proposed approach. This work can not only improve the efficiency and robustness of the global alignment of segmented mirror space telescopes, but also provide an intuitive and in-depth understanding for the mechanism of aberration calculation using PSF image features.
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