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Distributed optical synthetic aperture position-transformed method with high-frequency domain coverage.

Kui Zhang, Weimin Bao, Haiyan Fang

    Optics Express
    |October 20, 2023
    PubMed
    Summary

    Achieving large apertures for space telescopes with sparse sensors is difficult. This research introduces High-Frequency domain-Covering discrete Archimedean Spiral Arrays (HFCASA) to significantly enhance frequency coverage for distributed optical synthetic aperture systems.

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    Area of Science:

    • Optics
    • Astronomy
    • Space Science

    Background:

    • Space-based direct optical detection requires ultrahigh-equivalent apertures.
    • Distributed Optical Synthetic Aperture (DOSA) systems face challenges with very low filling ratios.

    Purpose of the Study:

    • To propose a novel method for enhancing frequency domain coverage in DOSA systems.
    • To enable high-resolution space-based optical detection with sparse arrays.

    Main Methods:

    • Introduction of High-Frequency domain-Covering discrete Archimedean Spiral Arrays (HFCASA).
    • Utilizing a position-transformation method for array design.

    Main Results:

    • Golay3 HFCASA demonstrated significantly improved frequency domain coverage.
    • Achieved resolution requirements for a 200 m aperture telescope with a 0.0675% filling ratio.

    Conclusions:

    • HFCASA offers a viable solution for sparse array design in DOSA systems.
    • Provides a theoretical foundation for future deep-space exploration using DOSA technology.