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Research on simultaneous tracking technology using a single detector for two nodes in space laser communication

Guosheng Fan, Min Zhang, Rui Weng

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    |September 23, 2025
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    Summary

    This study demonstrates simultaneous tracking of two space laser communication nodes using a single detector and code division multiple access (CDMA). This innovation reduces system complexity and cost for high-rate data transmission.

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    Area of Science:

    • Optical engineering
    • Space communication systems
    • Signal processing

    Background:

    • Space laser communication is crucial for high-rate data transmission but faces challenges in multi-node tracking.
    • Conventional systems use multiple detectors, increasing cost and complexity.
    • The space environment poses significant hurdles for reliable communication.

    Purpose of the Study:

    • To develop a novel approach for simultaneous tracking of multiple nodes in space laser communication using a single detector.
    • To reduce the cost and complexity of space laser communication systems.
    • To enhance the reliability and precision of tracking in dynamic space environments.

    Main Methods:

    • Implementation of code division multiple access (CDMA) for multi-signal detection.
    • Development of real-time signal processing algorithms for simultaneous tracking.
    • Experimental validation using a single-detector system.

    Main Results:

    • Achieved tracking accuracies of 9.8 µrad and 9.5 µrad (azimuth) and 23.1 µrad and 29.3 µrad (elevation) for two distinct nodes.
    • Successfully maintained stable communication links between nodes.
    • Demonstrated high tracking precision and reliable system performance.

    Conclusions:

    • A single-detector system enabled by CDMA and advanced signal processing can achieve simultaneous multi-node tracking.
    • This approach significantly reduces system complexity and cost for space laser communication.
    • The demonstrated technology offers a promising solution for future high-rate, multi-node space optical networks.