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Passive synthetic aperture imaging using an achromatic grating interferometer

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Abstract

Synthetic aperture imaging with active systems is relatively well developed. The implementation of passive systems, on the other hand, is being hindered by a low SNR and the difficulty in achieving 2-D aperture fill. The achromaticity of the grating interferometer permits the use of a wider instantaneous spectral bandwidth to produce better SNR, and it provides a simple means to synthesize a 2-D aperture. A passive synthetic aperture imaging approach implemented with an achromatic grating interferometer is described, and laboratory experimental results are presented to demonstrate the proposed concept.

© 1986 Optical Society of America

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