On temporal correlations in high-resolution frequency counting
| Autor: | Dunker, Tim, Hauglin, Harald, Rønningen, Ole Petter |
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| Rok vydání: | 2016 |
| Předmět: | |
| Zdroj: | European Frequency and Time Forum (EFTF), 2016 |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1109/EFTF.2016.7477833 |
| Popis: | We analyze noise properties of time series of frequency data from different counting modes of a Keysight 53230A frequency counter. We use a 10 MHz reference signal from a passive hydrogen maser connected via phase-stable Huber+Suhner Sucoflex 104 cables to the reference and input connectors of the counter. We find that the high resolution gap-free (CONT) frequency counting process imposes long-term correlations in the output data, resulting in a modified Allan deviation that is characteristic of random walk phase noise. Equally important, the CONT mode results in a frequency bias. In contrast, the counter's undocumented raw continuous mode (RCON) yields unbiased frequency stability estimates with white phase noise characteristics, and of a magnitude consistent with the counter's 20 ps single-shot resolution. Furthermore, we demonstrate that a 100-point running average filter in conjunction with the RCON mode yields resolution enhanced frequency estimates with flicker phase noise characteristics. For instance, the counter's built-in moving-average function can be used. The improved noise characteristics of the averaged RCON mode versus the CONT mode imply that the former mode yields frequency estimates with improved confidence for a given measurement time. Comment: Submitted to the proceedings of the 30th European Frequency and Time Forum, held at the University of York, UK, 4 April to 7 April 2016 |
| Databáze: | arXiv |
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