Femtosecond Optical Two-Way Time-Frequency Transfer in the Presence of Motion
| Autor: | Nathan R. Newbury, Hugo Bergeron, William C. Swann, Laura C. Sinclair, Kevin C. Cossel, Jean-Daniel Deschenes, Isaac H. Khader, Michael Cermak |
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| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
Physics
Physics - Instrumentation and Detectors Mathematical analysis FOS: Physical sciences Instrumentation and Detectors (physics.ins-det) 01 natural sciences Synchronization Time and frequency transfer 010305 fluids & plasmas Time–frequency analysis Theory of relativity Reciprocity (electromagnetism) 0103 physical sciences Dispersion (optics) Time deviation Time transfer 010306 general physics Optics (physics.optics) Physics - Optics |
| Popis: | 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-1-fs time deviation despite effective velocities of $\ifmmode\pm\else\textpm\fi{}25\phantom{\rule{0.16em}{0ex}}\mathrm{m}/\mathrm{s}$, 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 a two-sigma statistical uncertainty of 330 as. |
| Databáze: | OpenAIRE |
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