运动条件下的飞秒光双向时频传输
Femtosecond Optical Two-Way Time-Frequency Transfer in the Presence of Motion
摘要：
平台运动对高精度光学时间和频率传递提出了重大挑战。我们给出了详细的描述，这些挑战和他们的解决方案，在基于梳状光双向时间和频率传输（O-TWTFT）。具体来说，我们讨论了由于相对论和由于异步采样，光和电色散的影响，和速度相关的收发器校准的互易性的故障。我们提出了一个详细的推导方程的梳状基O-TWTFT中存在的运动。我们描述了基于这些方程的实时信号处理算法的实现，并展示了两个站点在湍流空气路径上的主动同步，尽管有效速度为+/-25 m/s，但低于飞秒时间偏差，这是我们的物理设置可实现的最大值。随着时间转移方程的实现，我们发现没有速度依赖的同步时钟之间的偏差，在两个西格玛统计不确定性为330阿秒。
英文摘要：
Platform motion poses significant challenges to high-precision optical time and frequency transfer. We give a detailed description of these challenges and their solutions in comb-based optical two-way time and frequency transfer (O-TWTFT). Specifically, we discuss the breakdown in reciprocity due to relativity and due to asynchronous sampling, the impact of optical and electrical dispersion, and velocity-dependent transceiver calibration. We present a detailed derivation of the equations governing comb-based O-TWTFT in the presence of motion. We describe the implementation of real-time signal processing algorithms based on these equations and demonstrate active synchronization of two sites over turbulent air paths to below a femtosecond time deviation despite effective velocities of +/-25 m/s, which is the maximum achievable with our physical setup. With the implementation of the time transfer equation derived here, we find no velocity-dependent bias between the synchronized clocks to within at two-sigma statistical uncertainty of 330 attoseconds.
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