Design of a co-aperture composite imaging system for visible light remote sensing camera and synthetic aperture radar

Zhao Wei; Yue Pan; Xuewu Fan

doi:10.1117/12.3007773

18 December 2023 Design of a co-aperture composite imaging system for visible light remote sensing camera and synthetic aperture radar

Zhao Wei, Yue Pan, Xuewu Fan

Author Affiliations +

Proceedings Volume 12965, AOPC 2023: Novel Technologies and Instruments for Astronomical Imaging and Spectroscopy; 129650A (2023) https://doi.org/10.1117/12.3007773
Event: Applied Optics and Photonics China 2023 (AOPC2023), 2023, Beijing, China

Abstract

According to requirements, a co-aperture design has been performed for the visible light remote sensing camera and the synthetic aperture radar, allowing the remote sensing satellite to acquire both visible light and radar images simultaneously. The front system is a two-mirror, no-focus system with a primary mirror diameter of 3 meters, serving to compress the beam. To avoid obstruction, the primary mirror is placed off-axis. The visible light component consists of an off-axis three mirror system, with the entrance pupil aligned with the exit pupil of the front system. All three mirrors are secondary mirrors with quadratic surfaces. The primary mirror size is 500mm, and the system's focal length is 7.22m. The overall ground resolution of the system reaches sub-meter level, with a full field of view measuring 0.8° × 0.03°. Optical design software ZEMAX was employed to evaluate the imaging quality within the visible light wavelength range. The results indicate that the spot size of the system is smaller than 13μm within each field of view. At the Nyquist frequency, the modulation transfer function (MTF) values for each field of view exceed 0.4, approaching the diffraction limit, showcasing good imaging quality. This design enhances the satellite's adaptability and observational capabilities, reduces the overall size of the instrument, and saves on manufacturing and launch costs.

(2023) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Zhao Wei, Yue Pan, and Xuewu Fan "Design of a co-aperture composite imaging system for visible light remote sensing camera and synthetic aperture radar", Proc. SPIE 12965, AOPC 2023: Novel Technologies and Instruments for Astronomical Imaging and Spectroscopy, 129650A (18 December 2023); https://doi.org/10.1117/12.3007773

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KEYWORDS

Imaging systems

Remote sensing

Design and modelling

Mirrors

Synthetic aperture radar

Satellites

Cameras

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