Note: A new method for directly reducing the sampling jitter noise of the digital phasemeter

• Published in: Review of Scientific Instruments
• Main Author: Liang, Yu-Rong
• Other Authors: National Key Research and Development Program of China, National Natural Science Foundation of China
• Format: Article in Journal/Newspaper
• Language: English
• Published: AIP Publishing 2018
• Subjects: Instrumentation; Luleå
• Online Access: http://dx.doi.org/10.1063/1.5011654; https://pubs.aip.org/aip/rsi/article-pdf/doi/10.1063/1.5011654/15958359/036106_1_online.pdf

The sampling jitter noise is one non-negligible noise source of the digital phasemeter used for space gravitational wave detection missions. This note provides a new method for directly reducing the sampling jitter noise of the digital phasemeter, by adding a dedicated signal of which the frequency, amplitude, and initial phase should be pre-set. In contrast to the phase correction using the pilot-tone in the work of Burnett, Gerberding et al., Liang et al., Ales et al., Gerberding et al., and Ware et al. [M.Sc. thesis, Luleå University of Technology, 2010; Classical Quantum Gravity 30, 235029 (2013); Rev. Sci. Instrum. 86, 016106 (2015); Rev. Sci. Instrum. 86, 084502 (2015); Rev. Sci. Instrum. 86, 074501 (2015); and Proceedings of the Earth Science Technology Conference (NASA, USA, 2006)], the new method is intrinsically additive noise suppression. The experiment results validate that the new method directly reduces the sampling jitter noise without data post-processing and provides the same phase measurement noise level (10−6 rad/Hz1/2 at 0.1 Hz) as the pilot-tone correction.