Noise phase measurement method and device based on homologous signals

By using a homologous signal method in phase meter noise measurement, signals of different frequencies are generated using the same channel and collected through a single port, and the pilot signal is used to correct the phase fluctuation of the signal to be measured, solving the noise coupling problem in the prior art and improving the measurement accuracy.

CN119757862AActive Publication Date: 2025-04-04HUAZHONG UNIV OF SCI & TECH
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Patent Information

Application Number
CN202411775881.4
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-05
Publication Date
2025-04-04
Estimated Expiration
2044-12-05

AI Technical Summary

Technical Problem

In the existing phase meter noise measurement method, since two ports are required to collect signals, non-common mode noise is coupled to the signal to be measured, affecting the measurement accuracy.

Method used

The noise phase measurement method based on homologous signals is adopted, and the original signals containing two different frequency components are generated through the same channel, low-pass and band-pass filtering are performed respectively to generate the signal to be measured and the pilot signal is acquired through a single port of the phase meter. The pilot signal is used to correct the phase fluctuation of the signal to be measured and suppress the ADC aperture jitter noise.

Benefits of technology

It effectively suppresses the noise floor of the phase meter, improves the accuracy of noise measurement, and realizes high-precision measurement of residual noise in the signal to be measured.

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Abstract

The invention belongs to the technical field of precision measurement, and discloses a noise phase measurement method based on homologous signals and a corresponding device. According to the method, the noise measurement precision of the phase meter is improved through the following steps that under the action of an external trigger clock, an original signal containing two different frequencies f1 and f2 is generated through the same channel of a signal source; the original signal is equally divided into two beams, one beam is subjected to low-pass filtering to obtain a to-be-measured signal with the frequency of f1, and the other beam is subjected to band-pass filtering to obtain a pilot signal with the frequency of f2; combining the two beams of signals to form a dual-frequency signal, and collecting the dual-frequency signal through a single port of a phase meter; the phase meter extracts phase fluctuations of the to-be-measured signal and the pilot signal respectively; and finally, correcting the phase fluctuation of the to-be-measured signal by using the phase fluctuation of the pilot signal so as to obtain the corrected phase fluctuation. Correspondingly, the invention further provides a noise phase measuring device based on the homologous signals, and the noise phase measuring device is used for achieving the method.
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