The relationship and the mutual benefits of timekeeping and Global Navigation Satellite Systems (GNSS) are reviewed, showing how each field has been enriched and will continue to progress, based on the progress of the other field. The role of GNSSs in the calculation of Coordinated Universal Time (UTC), as well as the capacity of GNSSs to provide UTC time dissemination services are described, leading now to a time transfer accuracy of the order of 1–2 ns. In addition, the fundamental role of atomic clocks in the GNSS positioning is illustrated. The paper presents a review of the current use of GNSS in the international timekeeping system, as well as illustrating the role of GNSS in disseminating time, and use the time and frequency metrology as fundamentals in the navigation service.

中文翻译：

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精确的时标和导航系统：计时和定位的共同利益

回顾了计时与全球导航卫星系统（GNSS）的关系和互惠互利，显示了在另一个领域的基础上，每个领域如何丰富并将继续发展。描述了GNSS在协调世界时（UTC）的计算中的作用，以及提供UTC时间传播服务的GNSS的能力，从而使时间传递精度达到1-2 ns数量级。此外，还说明了原子钟在GNSS定位中的基本作用。本文介绍了GNSS在国际计时系统中的当前使用情况，并说明了GNSS在传播时间方面的作用，并使用时间和频率计量学作为导航服务的基础。