The realization of high-precision time synchronization between space-based distributed moving platforms primarily involves high-precision time measurement and the maintenance of a highly stable laser communication link. We design and implement an intensity modulation/direct detection (IM/DD) communication and time synchronization integrated system based on the principle of bidirectional single-trip ranging. Combined with a beaconless coarse-fine composite acquisition, pointing, and tracking method, this system achieves time synchronization between distributed moving platforms. A spatial laser link equivalent dynamic simulation system was set up in the laboratory to conduct two-way communication and time synchronization tests. Under a communication rate of approximately 1.25 Gbps, the system achieved a time synchronization accuracy better than 1.5 ns and a system tracking accuracy better than 5 μrad (0.5°/s).
Li et al. (Tue,) studied this question.
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