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Low-Earth Orbit (LEO) satellite systems have rapidly advanced in various fields, including space target detection, mobile communication, and navigation. High-precision time references are essential for accurate navigation and positioning, with chip atomic clocks offering a viable solution for establishing high-precision time-frequency references for LEO satellites. This paper proposes a K-Medoids clustering-based strategy for optimal deployment of chip atomic clocks, considering synchronization performance, frequency stability, and cost. Simulation results validate the strategy’s effectiveness, showing significant improvements in clock offset accuracy and frequency stability compared to high-stability crystal oscillators, random placement, and K-Means clustering, reducing the system clock offset to 10.153 ns, with improvements of 55.30%, 36.25%, and 18.82%, respectively.

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Chip Atomic Clock Placement Strategy for Low-Earth Orbit Satellite Time Synchronization

  • 会议论文

  • 发表日期：

    2025年

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  • Hongzhou Zhang,
  • Jiaen Zhou,
  • Yafei Zhao

摘要

Low-Earth Orbit (LEO) satellite systems have rapidly advanced in various fields, including space target detection, mobile communication, and navigation. High-precision time references are essential for accurate navigation and positioning, with chip atomic clocks offering a viable solution for establishing high-precision time-frequency references for LEO satellites. This paper proposes a K-Medoids clustering-based strategy for optimal deployment of chip atomic clocks, considering synchronization performance, frequency stability, and cost. Simulation results validate the strategy’s effectiveness, showing significant improvements in clock offset accuracy and frequency stability compared to high-stability crystal oscillators, random placement, and K-Means clustering, reducing the system clock offset to 10.153 ns, with improvements of 55.30%, 36.25%, and 18.82%, respectively.