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Adjustable higher SNR and long-range 3D-imaging cluster lidar based on a coded full-waveform technique.

Xingyu Yang, Liting Hao, Yuanqing Wang

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    A new cluster lidar (C-Lidar) system uses coded full-waveform technology to achieve both high signal-to-noise ratio (SNR) and long-range 3D imaging. This innovation addresses a key challenge in lidar technology for military applications.

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    Area of Science:

    • Optics and Photonics
    • Remote Sensing Technology
    • Military Engineering

    Background:

    • Three-dimensional (3D) lidar imaging is crucial for civil, commercial, and military applications.
    • High signal-to-noise ratio (SNR) and long-range detection are essential for military lidar, but achieving both simultaneously presents a significant challenge.
    • Existing lidar technologies struggle to reconcile the conflicting requirements of high SNR and extended detection range.

    Purpose of the Study:

    • To propose and demonstrate an adjustable, higher SNR, and long-range 3D-imaging cluster lidar (C-Lidar) system.
    • To overcome the inherent contradiction between high SNR and long-range detection in lidar technology.
    • To provide a novel solution for advanced 3D imaging in demanding environments, particularly for military use.

    Main Methods:

    • Development of a cluster lidar (C-Lidar) system utilizing coded full-waveform technology.
    • Leveraging linear mode avalanche photodiode (Lm-APD) multiplexing and space-time domain laser codec technology.
    • Employing an 8x8 Lm-APD array for rapid acquisition of 64x64x64 pixels within 6.4 milliseconds.

    Main Results:

    • A mathematical model demonstrated an 18 dB increase in SNR.
    • The SNR is adjustable by controlling the product of Lm-APDs and encoding sequence length, allowing for significantly higher SNR values.
    • A principle prototype experiment successfully achieved clear 3D imaging at a range of 2 km.

    Conclusions:

    • The proposed C-Lidar system effectively addresses the SNR-range trade-off in lidar technology.
    • The system demonstrates the capability for adjustable, high SNR, and long-range 3D imaging.
    • C-Lidar shows significant promise for enhancing 3D imaging capabilities in military and other advanced applications.