Simplified Three-Cornered-Hat Technique for Frequency Stability Measurements

Gunn, Lachlan J.; Catlow, Peter G.; Al-Ashwal, Waddah A.; Hartnett, John G.; Allison, Andrew; Abbott, Derek

doi:10.1109/tim.2013.2285796

Cited by 5 publications

(1 citation statement)

References 22 publications

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“…6(a), and the linewidth and signal-to-noise ratio (SNR) of the fringe are about 20 Hz and 518, respectively. The frequency stability of the ISCAC is measured with the three-cornered hat method [28] by comparing with two H-masers for about 11 days, the result is shown in Fig. 6(b).…”

Section: Resultsmentioning

confidence: 99%

Development of the integrated integrating sphere cold atom clock*

Yu¹,

Meng²,

Ye³

et al. 2019

Chinese Phys. B

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We develop an integrated integrating sphere cold atom clock (ISCAC), which mainly consists of physical package, laser system, microwave source, and electronics. This compact system is more stable and reliable than the previous version. The experimental results show that the short term frequency stability of 5.4 × 10 − 13 τ − 1 / 2 and 2.9 × 10−15 at 1-day integrating time are achieved.

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Section: Resultsmentioning

confidence: 99%

Development of the integrated integrating sphere cold atom clock*

Yu¹,

Meng²,

Ye³

et al. 2019

Chinese Phys. B

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High-precision synchronization detection method for bistatic radar

Feng

Sun

2019

Review of Scientific Instruments

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To improve the accuracy of radar ranging and positioning under complex backgrounds, a high-precision synchronization detection method for bistatic radar is proposed based on different-frequency phase processing. First, the transmit signal and receive signal are converted to radio frequency pulses by frequency conversion. Then, the transmit signal is roughly measured with a field-programmable gate array. The obtained rough signal is used as the reference signal under the control of the direct digital synthesizer frequency synthesizer. Second, the transmit signal and receive signal are each synchronized with the reference signal in a different-frequency phase detection. These detection results are used as the starting signal and stopping signal of the counter gate. Finally, all the signals are counted, and the time synchronization between the transmit signal and the receive signal is implemented by processing the counting value. The experimental results show that a time synchronization precision of 1.5 ps and a frequency stability of 6.2 × 10−13/s can be reached. This method has the advantages of a fast time response, good noise suppression, and high measurement precision and strong system reliability.

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