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Note: A new method for directly reducing the sampling jitter noise of the digital phasemeter
1State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, China and Center for Cold Atom Physics, Chinese Academy of Sciences, Wuhan 430071, China.
The Review of Scientific Instruments
|April 2, 2018
Summary
A new method directly reduces sampling jitter noise in digital phasemeters for gravitational wave detection. This additive noise suppression technique achieves a phase measurement noise level of 10⁻⁶ rad/√Hz without post-processing.
Area of Science:
- Space physics
- Gravitational wave detection
- Signal processing
Background:
- Sampling jitter noise is a significant issue in digital phasemeters for space-based gravitational wave detection.
- Existing methods often require complex post-processing for noise reduction.
Purpose of the Study:
- To introduce a novel, direct method for reducing sampling jitter noise in digital phasemeters.
- To offer an alternative to pilot-tone correction methods.
Main Methods:
- Addition of a dedicated, pre-set signal (frequency, amplitude, initial phase) to the digital phasemeter.
- This method functions as an intrinsic additive noise suppression technique.
Main Results:
- The new method directly reduces sampling jitter noise.
- Experimental results confirm the effectiveness of the additive noise suppression.
- Achieved a phase measurement noise level of 10⁻⁶ rad/√Hz at 0.1 Hz, comparable to pilot-tone correction.
Conclusions:
- The proposed method effectively suppresses sampling jitter noise in digital phasemeters.
- It offers a simpler approach by eliminating the need for data post-processing.
- This technique is suitable for gravitational wave detection missions requiring high phase measurement precision.
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