Clock synchronization is critical for synchronous pseudolite systems. Wireless synchronization methods are desirable for their flexibility in system deployment, and most of them build a tree topology of time information flow based on master‐slave synchronization between pseudolites. A slave pseudolite can receive signals broadcast by multiple pseudolites; however, existing methods usually utilize one signal and ignore others in which the time information could improve synchronization precision and reliability. We present a mesh topology based clock synchronization (MTCS) technique by utilizing all received signals. MTCS builds a mesh topology of time information flow, which can keep synchronization in case of link interruption or pseudolite failure. The coupling relationship of slave clocks is derived, and the influence of measurement biases is analyzed. As shown by both analysis and simulations, MTCS has better clock synchronization precision. When link interruption or pseudolite failures occur, MTCS is more robust than tree topology based methods.

中文翻译：

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基于网状拓扑的伪卫星系统时钟同步技术

时钟同步对于同步伪卫星系统至关重要。无线同步方法因其在系统部署中的灵活性而令人期望，并且大多数方法基于伪卫星之间的主从同步来构建时间信息流的树形拓扑。从属伪卫星可以接收多个伪卫星广播的信号。然而，现有方法通常利用一种信号而忽略其他信号，其中时间信息可以提高同步精度和可靠性。我们通过利用所有接收到的信号提出基于网格拓扑的时钟同步（MTCS）技术。MTCS建立了时间信息流的网状拓扑，可以在链路中断或伪卫星故障的情况下保持同步。得出从时钟的耦合关系，并分析了测量偏差的影响。如分析和仿真所示，MTCS具有更好的时钟同步精度。当发生链路中断或伪卫星故障时，MTCS比基于树拓扑的方法更可靠。