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Simulating Imaging of Large Scale Radio Arrays on the Lunar Surface
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High resolution non-iterative aperture synthesis.

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    This study introduces non-iterative phasing for multiple illuminators and receive apertures in multiple-input multiple-output (MIMO) imaging systems. This method enhances synthetic aperture size, improving system resolution and enabling precise calibration.

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    Area of Science:

    • Optical Engineering
    • Signal Processing
    • Imaging Systems

    Background:

    • Resolution in multiple-input multiple-output (MIMO) imaging is limited by synthetic aperture size.
    • Synthetic aperture size depends on coordinate shifts derived from illuminator and receiver positions.
    • Prior work focused on intra-aperture synthesis with single receive apertures.

    Purpose of the Study:

    • To demonstrate non-iterative phasing for inter-aperture synthesis using multiple illuminators and receive apertures.
    • To show that piston, tip, and tilt can be calculated via inter-aperture phasing post intra-aperture phasing.
    • To investigate the use of a fourth illuminator for enhanced resolution.

    Main Methods:

    • Developed a non-iterative phasing technique for inter-aperture synthesis in MIMO systems.
    • Employed simulated results to validate the calculation of piston, tip, and tilt.
    • Utilized the modulation transfer function (MTF) for quantitative resolution assessment.

    Main Results:

    • Successfully implemented non-iterative phasing for both multiple illuminators and multiple receive apertures.
    • Demonstrated the capability to compute piston, tip, and tilt corrections through inter-aperture phasing.
    • Showcased resolution enhancement with the addition of a fourth illuminator, verified by MTF analysis.

    Conclusions:

    • The proposed inter-aperture phasing method effectively expands the synthetic aperture in MIMO systems.
    • This technique allows for accurate calibration (piston, tip, tilt) and improved system resolution.
    • The findings suggest a viable approach for advancing MIMO imaging capabilities.