Conceptual study of 3.5-meter segmented mirror for geostationary Earth observation satellite

Mizutani, Tetsuya; Kamiya, Tomohiro; Sakai, Michito; Kitamoto, Kazuya; Yasuda, Susumu; Kimura, Tomoki; Tanaka, Marie

doi:10.1117/12.2324620

Cited by 4 publications

(2 citation statements)

References 2 publications

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“…We are investigating the feasibility of geostationary Earth observation telescope having 3.6 m aperture with segmented optical design [1,2]. Currently, fundamental studies and evaluations of the segment and segment system are being conducted.…”

Section: Introductionmentioning

confidence: 99%

Design concept of geostationary Earth observation segmented telescope and the wavefront management scheme

Sato

Okamoto

Iki

et al. 2023

International Conference on Space Optics — ICSO 2022

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For crisis management and monitoring, a geostationary Earth observation telescope with large segmented aperture is investigated in JAXA. The preliminary study showed the feasibility of the aperture size of 3.6 m consisted with six primary mirror segments and the fundamental optical design. In order to obtain nearly diffraction limited performance with the optical system in the orbit, the aperture synthesis and wavefront error correction have to be conducted through precise alignment procedure, and therefore the system needs to equip several actuators and sensors dedicatedly designed for the purpose. We constructed the system design through the combination of structural-thermal analysis and optical consideration, and then planned the alignment procedure after launch. Those design concept are planned to be tested in the miniature testbed of segmented optical system under construction. We show the testing equipment and procedure for segment co-phasing and wavefront correction intending in space use.

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Section: Introductionmentioning

confidence: 99%

Design concept of geostationary Earth observation segmented telescope and the wavefront management scheme

Sato

Okamoto

Iki

et al. 2023

International Conference on Space Optics — ICSO 2022

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“…Authors have been investigating an imaging satellite that can observe around Japan with a resolution of less than 10 meters in panchromatic mode 1 . In order to achieve such a resolution, a large aperture telescope is required, and the feasibility of a segmented telescope system was investigated 2 . Since the geostationary high-resolution imager will be operated in geostationary orbit, the distance to the Earth's surface will be very large, and a telescope with an extremely large aperture and long focal length will be required for high-resolution observations.…”

Section: Introductionmentioning

confidence: 99%

Experimental study of 3.6-meter segmented-aperture telescope for geostationary Earth observation satellite

Fujii

Uno

Ariki³

et al. 2021

International Conference on Space Optics — ICSO 2020

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The imager that observes the ground surface with high spatial resolution from geostationary orbit has been studied. To obtain image data with high ground sampling distance (GSD) from a geostationary orbit, an extremely large-diameter and long-focal-length telescope is required. In order to realize this imager, we plan to adopt a synthetic aperture type reflection optical telescope (Korsch type) in which the primary mirror is composed of six segmented mirrors. The diameter of the synthesized aperture telescope is approximately 3.6m, and the focal length is approximately 30 m. Prior to the development of the actual imager, we have been producing a full-scale prototype of the segmented mirror that constitutes the primary mirror and its supporting structure. The aperture shape of the prototype segmented mirror is hexagonal, and its diagonal length is approximately 1.35 m. The supporting structure of the prototype segmented mirror incorporates a mechanism (6-axes adjustment mechanism) for adjusting the alignment of the segmented mirror with six degrees of freedom. A mechanism for adjusting the curvature of the segmented mirror (curvature adjustment mechanism) was also incorporated. In this paper, the design, the manufacturing, and the testing status of this prototype are described.

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Ground Surface Calibration Sources for Earth Observation Segmented Telescope

Sato

Kimura

2019

IGARSS 2019 - 2019 IEEE International Geoscience and Remote Sensing Symposium

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Conceptual study of 3.5-meter segmented mirror for geostationary Earth observation satellite

Cited by 4 publications

References 2 publications

Design concept of geostationary Earth observation segmented telescope and the wavefront management scheme

Design concept of geostationary Earth observation segmented telescope and the wavefront management scheme

Experimental study of 3.6-meter segmented-aperture telescope for geostationary Earth observation satellite

Ground Surface Calibration Sources for Earth Observation Segmented Telescope

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