A Phase Difference Measurement Method Based on Data Continuation Correlation

A measurement method, phase difference technology, applied in the field of signal processing

Inactive Publication Date: 2016-08-17
LOGISTICAL ENGINEERING UNIVERSITY OF PLA
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Problems solved by technology

[0008] The purpose of the present invention is to propose a phase difference measurement method that is simple in calculation and can eliminate the influence of non-full-period sampling on the measurement results. Existing main problems, expanding its scope of application

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  • A Phase Difference Measurement Method Based on Data Continuation Correlation
  • A Phase Difference Measurement Method Based on Data Continuation Correlation
  • A Phase Difference Measurement Method Based on Data Continuation Correlation

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specific Embodiment approach

[0029] With two sinusoidal signals of the same frequency ( figure 2 shown) as an example.

[0030] 1) Pre-estimate the frequency or period of the sinusoidal signal x, y. Period estimation result is set to P∈Z + , P is the number of sampling points in one cycle.

[0031] 2) Judging whether the data is full cycle. The quotient of N divided by P is k and the remainder is m. If m=0, the correlation length matches the entire cycle of the signal, which is an integer multiple, and the data does not need to be processed at this time. If m>0, it means that the correlation length exceeds k periods but does not reach k+1 periods.

[0032] 3) Perform data extension processing. That is, according to the periodicity of the signal, find P-m data [x (k-1)P+m+1 ,...,x kP ], [y (k-1)P+m+1 ,...,y kP ], merge it into the original data sequence x, y, so that the correlation length is the whole period, and the signal sequence after data extension is: x e =[x 1 , x 2 ,...,x N , x (k-...

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Abstract

The invention relates to the field of signal processing, in particular to a phase difference measurement method related to data continuation. The suitable object of the method is phase difference measurement of any same frequency sinusoidal signals. The phase difference measurement method comprises the following steps that first, cycle pre-estimation is conducted on sampling signals; then whether data lengths are in full cycle or not is judged, full-cycle data continuation processing is conducted on non-full cycle data lengths, the length of related calculation is just or approximately the full cycle, and therefore the purpose of improving correlation method phase difference measurement precision is achieved; at last, a correlation method phase difference computational formula is used for calculating to obtain the phase difference of signals. According to the phase difference measurement method related to data continuation, implementation is simple, the anti-noise performance is higher, the precision is higher, the influence of non-full cycle sampling on the correlation method phase difference measurement precision is removed, and the correlation method phase difference measurement precision can be improved together by combining other methods.

Description

technical field [0001] The invention relates to the field of signal processing, in particular to a phase difference measurement method related to data extension. Background technique [0002] The measurement of phase difference has important and extensive applications in fault diagnosis, navigation and positioning, test control, power electronics, communication, radar and other fields. For example, the determination of the power factor in grid electric energy metering involves the accurate measurement of the phase difference between the corresponding voltage and current; in the precise positioning of high-precision radar, it depends on the high-precision measurement of the phase difference of the same frequency signal; in the high-precision flow Coriolis flowmeters are widely used in the field of measurement, and the measurement accuracy of the phase difference directly affects the measurement accuracy of the fluid quality. Therefore, it is particularly important to realize...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R25/00
Inventor 涂亚庆沈廷鳌李明
Owner LOGISTICAL ENGINEERING UNIVERSITY OF PLA
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