Imaging mechanism and degradation characteristic analysis of novel rotating synthetic aperture system

Zhi, Xu; Jiang, Shikai; Zhang, Lei; Wang, Dawei; Hu, Jianming; Gong, Jinnan

doi:10.1016/j.optlaseng.2020.106500

Cited by 10 publications

(2 citation statements)

References 18 publications

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“…The RSA imaging technology rotates the rectangular primary lens around the optical axis, by which achieves highresolution sequence imaging covering different directions. Then, the RSA system can obtain almost identical imaging results with its equivalent filled aperture system by corresponding synthesis algorithms (Figure 7) [14]. This technology adopts the multi-time repeated sampling mode to reduce the satellite load mass, which is one of the most potential approaches to construct the space ultra-large aperture imaging system [15].…”

Section: Rotating Synthetic Aperture Imaging Technologymentioning

confidence: 99%

Development of new ultra-large aperture optical remote sensing imaging technology

Niu

Zhi

Jiang

et al. 2023

Second International Conference on Optoelectronic Information and Computer Engineering (OICE 2023)

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With the rapid development of earth observation by optical remote sensing satellites, there is an urgent requirement of remote sensing data with high-resolution in environmental monitoring, urban planning and other applications. The resolution of remote sensing images (RSIs) significantly depends on the aperture size of space imaging system. However, limited by manufacturing level and carrying capacity, the traditional optical materials and reflection/refraction imaging principle have encountered a bottleneck in the manufacturing of space imaging system with ultra-large aperture and lightweight. Consequently, it is necessary to develop brand new space optical imaging systems. In this paper, we summarize the imaging mechanism and development history of three ultra-large aperture imaging technologies, including synthetic aperture imaging technology, diffractive membrane imaging technology and rotating synthetic aperture imaging technology, and analyze the challenges existing in their application.

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Section: Rotating Synthetic Aperture Imaging Technologymentioning

confidence: 99%

Development of new ultra-large aperture optical remote sensing imaging technology

Niu

Zhi

Jiang

et al. 2023

Second International Conference on Optoelectronic Information and Computer Engineering (OICE 2023)

View full text Add to dashboard Cite

show abstract

“…Although the RSA system offers several advantages, such as a lightweight primary mirror, elimination of the need for splicing, and the absence of real-time surface shape maintenance in orbit, there are certain drawbacks in its sequential imaging process. Specifically, the rotation of the primary mirror introduces periodic changes in image quality, and the short side direction of the primary mirror yields lower image quality compared to the long side direction 13 . The point spread function (PSF) of the primary mirror changes over time and is coupled with satellite platform vibrations, primary mirror rotation errors, detector sampling, and imaging process noise, leading to the RSA system’s unique degradation mechanism that is both time-periodic and spatially asymmetric 14 .…”

Section: Introductionmentioning

confidence: 99%

Characterization and experimental verification of the rotating synthetic aperture optical imaging system

Sun,

Zhi,

Zhang

et al. 2023

Sci Rep

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The rotating synthetic aperture (RSA) optical imaging system employs a rectangular primary mirror for detection. During the imaging process, the primary mirror rotates around the center to achieve the aperture equivalent to the long side of the rectangle at different rotation angles. As a result, the system’s point spread function changes over time, causing periodic time-varying characteristics in the acquired images’ resolution. Moreover, due to the rectangular primary mirror, the images obtained by the RSA system are spatially asymmetric, with a lower resolution in the short side’s direction than in the long side’s direction. Hence, image processing techniques are necessary to enhance the image quality. To provide reference for the study of image quality improvement methods, we first characterize the imaging quality degradation mechanism of the RSA system and the time–space evolution law of the imaging process. We then establish an imaging experiment platform to simulate the dynamic imaging process of the RSA system. We quantify the RSA system’s impact on image degradation using objective indexes. Subsequently, by comparing the imaging experiment results with theoretical analysis, we verify the spatially asymmetric and temporally periodic imaging characteristics of the RSA system. Lastly, we introduce image super-resolution experiments to assess the limitations of directly applying generic deep learning-based single image super-resolution methods to the images captured by the RSA system, thereby revealing the challenges involved in improving image quality for the RSA system.

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Image fusion for the novelty rotating synthetic aperture system based on vision transformer

Sun,

Zhi,

Jiang

et al. 2024

Information Fusion

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Imaging mechanism and degradation characteristic analysis of novel rotating synthetic aperture system

Cited by 10 publications

References 18 publications

Development of new ultra-large aperture optical remote sensing imaging technology

Development of new ultra-large aperture optical remote sensing imaging technology

Characterization and experimental verification of the rotating synthetic aperture optical imaging system

Image fusion for the novelty rotating synthetic aperture system based on vision transformer

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