Efficient image-based wavefront correction using phase diversity and SPGD optimization for high-resolution optical remote sensing (Conference Presentation)

Makoto Hirose; Norihide Miyamura; Seichi Sato; Tadahito Mizutani; Toshiyoshi Kimura

doi:10.1117/12.2632225

3 October 2022 Efficient image-based wavefront correction using phase diversity and SPGD optimization for high-resolution optical remote sensing (Conference Presentation)

Makoto Hirose, Norihide Miyamura, Seichi Sato, Tadahito Mizutani, Toshiyoshi Kimura

Author Affiliations +

Proceedings Volume 12239, Unconventional Imaging and Adaptive Optics 2022; 1223909 (2022) https://doi.org/10.1117/12.2632225
Event: SPIE Optical Engineering + Applications, 2022, San Diego, California, United States

Abstract

Earth observation satellite with a large mirror telescope has been studied in Japan Aerospace Exploration Agency to offer a fine ground sampling distance from geostationary orbit. Our latest optical design has a 3.6-m primary mirror and thus aims to obtain a ground sampling distance of sub-10 m from an altitude of 36,000 km at visible wavelengths. To achieve diffraction-limited performance in such optics on orbit, the telescope equips with not only actuators to control primary and secondary mirrors but also a deformable mirror (DM) at the exit pupil plane for the fine phasing. For on-orbit wavefront correction with a deformable mirror, a wavefront sensorless image-based aberration correction scheme is advantageous from the viewpoint of severely limited hardware resources in satellites. Phase diversity (PD) and stochastic parallel gradient descent (SPGD) optimization are known for promising image-based approaches. The former is model-based and thus the estimation accuracy of wavefront aberration significantly depends on the model accuracy, while the other requires many measurements to compensate for large aberration. To alleviate these issues, we propose sequential use of PD and SPGD optimization to efficiently reduce wavefront correction. We first developed an optical testbed with an incoherent light source, a MEMS DM, and extended image targets, and then a wavefront correction experiment was carried out. As a result, the proposed method successfully achieved diffraction-limited imaging performance with a small number of measurements. We will also discuss the image dependence of the wavefront correction performance.

Conference Presentation

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Makoto Hirose, Norihide Miyamura, Seichi Sato, Tadahito Mizutani, and Toshiyoshi Kimura "Efficient image-based wavefront correction using phase diversity and SPGD optimization for high-resolution optical remote sensing (Conference Presentation)", Proc. SPIE 12239, Unconventional Imaging and Adaptive Optics 2022, 1223909 (3 October 2022); https://doi.org/10.1117/12.2632225

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KEYWORDS

Wavefronts

Remote sensing

Mirrors

Deformable mirrors

Model-based design

Satellites

Telescopes

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