From Event: SPIE Optical Engineering + Applications, 2019
The design of four mirrors anti-astigmatism astronomical telescope is carried out for low earth orbit satellite. By integrating with Cassagrain and Schwartzschild configurations, the telescope is design. It contains four mirrors with conic surface, to form an aberration free. The system contains two parts: first part is the Cassagrain type telescope for pick up the ground object to the stop position, and the second part is Schwartzschild configurations as relay optics, which is to relay the image to high resolution CCD sensor to provide 0.5 ground space distance image. The system is symmetric with aberration free within a one cubic size fitted for small satellite. The optic mechanical is simple easy to assemble for optical calibration, while the body is rigid in space.
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Jiun-Woei Huang, "The design of a four-mirror anti-astigmatism astronomical telescope," Proc. SPIE 11104, Current Developments in Lens Design and Optical Engineering XX, 111040E (Presented at SPIE Optical Engineering + Applications: August 12, 2019; Published: 30 August 2019); https://doi.org/10.1117/12.2529905.