Central obscuration effects on optical synthetic aperture imaging

Xue-wen Wang; Xiao Luo; Li-gong Zheng; Xue-jun Zhang

doi:10.1117/12.2054085

21 February 2014 Central obscuration effects on optical synthetic aperture imaging

Xue-wen Wang, Xiao Luo, Li-gong Zheng, Xue-jun Zhang

Proceedings Volume 9142, Selected Papers from Conferences of the Photoelectronic Technology Committee of the Chinese Society of Astronautics: Optical Imaging, Remote Sensing, and Laser-Matter Interaction 2013; 91420D (2014) https://doi.org/10.1117/12.2054085
Event: Selected Proceedings of the Photoelectronic Technology Committee Conferences held July-December 2013, 2013, SuZhou, China

Abstract

Due to the central obscuration problem exists in most optical synthetic aperture systems, it is necessary to analyze its effects on their image performance. Based on the incoherent diffraction limited imaging theory, a Golay-3 type synthetic aperture system was used to study the central obscuration effects on the point spread function (PSF) and the modulation transfer function (MTF). It was found that the central obscuration does not affect the width of the central peak of the PSF and the cutoff spatial frequency of the MTF, but attenuate the first sidelobe of the PSF and the midfrequency of the MTF. The imaging simulation of a Golay-3 type synthetic aperture system with central obscuration proved this conclusion. At last, a Wiener Filter restoration algorithm was used to restore the image of this system, the images were obviously better.

Citation Download Citation

Xue-wen Wang, Xiao Luo, Li-gong Zheng, and Xue-jun Zhang "Central obscuration effects on optical synthetic aperture imaging", Proc. SPIE 9142, Selected Papers from Conferences of the Photoelectronic Technology Committee of the Chinese Society of Astronautics: Optical Imaging, Remote Sensing, and Laser-Matter Interaction 2013, 91420D (21 February 2014); https://doi.org/10.1117/12.2054085

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KEYWORDS

Modulation transfer functions

Imaging systems

Point spread functions

Synthetic aperture imaging

Image restoration

Image resolution

Spatial frequencies

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