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    Area of Science:

    • * Remote Sensing
    • * Optical Engineering
    • * Signal Processing

    Background:

    • * Ground-based inverse synthetic aperture LADAR (ISAL) is used for imaging geosynchronous objects.
    • * Target rotation and vibration introduce phase errors, leading to defocused 2D images.
    • * Accurate imaging of orbiting objects is crucial for surveillance and characterization.

    Purpose of the Study:

    • * To develop an imaging method that overcomes phase errors in ISAL.
    • * To improve the focus and accuracy of 2D and 3D images of orbiting targets.
    • * To enhance the performance of ISAL systems for geosynchronous object imaging.

    Main Methods:

    • * Design of a novel ISAL receiving channel layout with combined orthogonal short and long baselines.
    • * Implementation of an imaging method based on orthogonal interferometry processing.
    • * Estimation and compensation of phase errors caused by target rotation and vibration.

    Main Results:

    • * Improved focus in the 2D imaging results.
    • * High-accuracy 3D imaging results obtained.
    • * Effectiveness verified through simulation data.

    Conclusions:

    • * The proposed orthogonal interferometry processing method effectively addresses phase errors in ISAL.
    • * The novel channel layout and processing technique enhance imaging quality for geosynchronous objects.
    • * The method provides a viable solution for high-accuracy 2D and 3D ISAL imaging.