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

Tadahito Mizutani; Tomohiro Kamiya; Michito Sakai; Kazuya Kitamoto; Susumu Yasuda; Toshiyoshi Kimura; Marie Tanaka

doi:10.1117/12.2324620

23 October 2018 Conceptual study of 3.5-meter segmented mirror for geostationary Earth observation satellite

Tadahito Mizutani, Tomohiro Kamiya, Michito Sakai, Kazuya Kitamoto, Susumu Yasuda, Toshiyoshi Kimura, Marie Tanaka

Proceedings Volume 10781, Earth Observing Missions and Sensors: Development, Implementation, and Characterization V; 1078117 (2018) https://doi.org/10.1117/12.2324620
Event: SPIE Asia-Pacific Remote Sensing, 2018, Honolulu, Hawaii, United States

Abstract

A feasibility study was conducted for an optical imager system assumed to be mounted on a geostationary orbit satellite for Earth observation. The targeted spatial resolution was less than 10 meters for panchromatic mode at nadir observation conditions, and the observation area was assumed to 100 × 100 square kilometers. The optical system was designed based on a Korsch three mirror anastigmat; the primary mirror was 3.5 meters in diameter, and the focal length was approximately 45 meters. The worst wavefront error was estimated at less than 0.017 λrms in the field of view. As the next step, the primary mirror was segmented, and a trade-off study was conducted on two types of segmented mirror configurations. The optical performance of each configuration was compared in terms of PSF and MTF. Moreover, the deterioration of optical performance due to the misalignment and distortion of the segmented mirror was discussed and numerically estimated by using the Monte Carlo method. The sensitivity of the wavefront error was consequently estimated for the segmented mirror assembly.

Citation Download Citation

Tadahito Mizutani, Tomohiro Kamiya, Michito Sakai, Kazuya Kitamoto, Susumu Yasuda, Toshiyoshi Kimura, and Marie Tanaka "Conceptual study of 3.5-meter segmented mirror for geostationary Earth observation satellite", Proc. SPIE 10781, Earth Observing Missions and Sensors: Development, Implementation, and Characterization V, 1078117 (23 October 2018); https://doi.org/10.1117/12.2324620

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