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Related Experiment Video

Updated: Oct 22, 2025

Continuous-Wave Propagation Channel-Sounding Measurement System - Testing, Verification, and Measurements

Continuous-Wave Propagation Channel-Sounding Measurement System - Testing, Verification, and Measurements

Published on: June 25, 2021

High-Resolution Multi-Channel Frequency Standard Comparator Using Digital Frequency Measurement.

Bo Xiao^1,2,3, Ya Liu^1,2,3, Xiaohui Li^1,2,3

¹National Time Service Center, Chinese Academy of Sciences, East Shu Yuan Road, Xi'an 710600, China.

Sensors (Basel, Switzerland)

|August 28, 2021

Summary

This summary is machine-generated.

A new digital frequency measurement method enhances atomic frequency standard comparison systems. This approach improves measurement resolution and noise floor, enabling precise measurement of highly stable frequency sources.

Keywords:

digital frequency measurement frequency standard comparison multichannel

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Last Updated: Oct 22, 2025

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Area of Science:

Metrology
Atomic Physics
Signal Processing

Background:

Advancements in atomic frequency standards necessitate higher measurement resolution in comparison systems.
Traditional dual mixer time difference methods suffer from noise sensitivity due to single zero-crossing point detection.

Purpose of the Study:

To develop a digital frequency measurement method for precise atomic frequency standard comparison.
To overcome the limitations of traditional methods, particularly noise sensitivity.

Main Methods:

Combines sinusoidal beat technology, multi-channel synchronous acquisition, and digital frequency measurement.
Employs differential compensation to mitigate system errors.
Utilizes a novel digital approach to frequency measurement.

Main Results:

Achieves a frequency measurement accuracy of less than 2.5 × 10^-14.
Demonstrates a noise floor better than 6.5 × 10^-15 at τ = 1 s.
Successfully enables precise measurement of highly stable frequency sources.

Conclusions:

The proposed digital frequency measurement method offers high accuracy and a low noise floor.
This method effectively addresses the limitations of traditional techniques for atomic frequency standard comparison.
The system is suitable for precise measurements of advanced, stable frequency sources.