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Method for measuring signal phase difference

A signal phase and difference measurement technology, applied in the measurement device, measuring electrical variables, phase angle between voltage and current, etc., can solve the problems of high signal-to-noise ratio, poor applicability, etc., to achieve high accuracy and fast calculation speed Effect

Inactive Publication Date: 2014-06-25
INST OF SEMICONDUCTORS - CHINESE ACAD OF SCI
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Problems solved by technology

[0008] In summary, the applicant found that the prior art signal phase difference measurement method has the following defects: all require the measurement sample to have a high signal-to-noise ratio, and the applicability is poor

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  • Method for measuring signal phase difference

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Embodiment Construction

[0022] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0023] It should be noted that, in the drawings or descriptions of the specification, similar or identical parts all use the same figure numbers. And in the accompanying drawings, it is marked for simplicity or convenience. Furthermore, implementations not shown or described in the accompanying drawings are forms known to those of ordinary skill in the art. Additionally, while illustrations of parameters including particular values ​​may be provided herein, it should be understood that the parameters need not be exactly equal to the corresponding values, but rather may approximate the corresponding values ​​within acceptable error margins or design constraints.

[0024] In an exemplary embodiment of the present invention...

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Abstract

The invention provides a method for measuring a signal phase difference, which comprises the following steps: A) forming a three-dimensional observation signal matrix X(n) by a one-dimensional measured signal and two one-dimensional standard sine reference signals, wherein the measured signal contains a single-frequency sine measured signal and a noise signal; B) performing optimizing iterative operation for the first time on the observation signal matrix X(n), thereby obtaining a 3*3 separating matrix W1 and a three-dimensional source component matrix S(n); C) judging a row k in which a noise component Ig(n) in the source component matrix S(n) is located; D) when k is equal to 1, executing the step G); G) selecting two elements alpha and beta from a mixed matrix A, and linearly adding and multiplying with a sine component and a cosine component in the source component matrix, thereby obtaining the single-frequency sine measured signal in the measured signal, wherein the mixed matrix A is an inverse matrix of the separating matrix; and H) performing the phase difference measurement through the obtained single-frequency sine measured signal. According to the method provided by the invention, the demand on SNR (Signal to Noise Ratio) of the to-be-measured signal is reduced and the applicability of the to-be-measured signal is increased.

Description

technical field [0001] The invention relates to the technical field of signal processing in the electronic industry, in particular to a method for measuring signal phase difference. Background technique [0002] Phase difference measurement of periodic signals with the same frequency is widely used in signal analysis, circuit parameter testing, electrical technology, industrial automation, intelligent control, communication and electronic technology, etc. Determination of power factor angle, etc. [0003] In engineering measurement, due to the complexity of the environment in which the measurement equipment is located, the measured signal is often superimposed with one or another noise, such as: zero drift, ringing, glitches, temperature drift, harmonic interference, white noise interference, etc. . These noises usually cause the shape of the measured signal to be distorted, or even submerged in the noise, causing serious difficulties to the measurement. Therefore, the ke...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R25/00
Inventor 龚国良鲁华祥边昳金敏陈天翔
Owner INST OF SEMICONDUCTORS - CHINESE ACAD OF SCI
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