Adaptive Unbiased Phase Difference Estimation Method under Frequency Mismatch Condition

A mismatch condition, adaptive technology, applied in the field of signal processing

Inactive Publication Date: 2019-07-30
LOGISTICAL ENGINEERING UNIVERSITY OF PLA
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Problems solved by technology

[0009] The purpose of the present invention is to propose a phase difference estimation method with strong noise resistance, high estimation accuracy and good applicability, which can eliminate the influence of frequency estimation mismatch on phase difference measurement, and is suitable for phase difference measurement of any two cosine signals with the same frequency , solve the main problems existing in the existing phase difference measurement method, and expand its application range

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  • Adaptive Unbiased Phase Difference Estimation Method under Frequency Mismatch Condition
  • Adaptive Unbiased Phase Difference Estimation Method under Frequency Mismatch Condition
  • Adaptive Unbiased Phase Difference Estimation Method under Frequency Mismatch Condition

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specific Embodiment approach

[0028] Step 1: Construct the frequency signals cosωn and sinωn, and set the algorithm step size μ=0.01;

[0029] Step 2: Calculate the first cosine signal x 1 Estimated value of (n) s 1 '(n)=a 1 '(n)cosωn-b 1 '(n)sinωn;

[0030] Step 3: Calculate the second cosine signal x 2 Estimated value of (n) s 2 '(n)=a 2 '(n)cosωn-b 2 '(n)sinωn;

[0031] Step 3: Construct the error signal e 1 (n)=x 1 (n)-s 1 '(n) and e 2 (n)=x 2 (n)-s 2 '(n);

[0032] Step 4: Use the adaptive iterative calculation method to estimate a respectively 1 '(n+1), b 1 '(n+1), a 2 '(n+1) and b 2 '(n+1);

[0033] Step 5: According to the calculated a 1 '(n+1), b 1 '(n+1), a 2 '(n+1) and b 2 ’(n+1) value, calculate the phase difference of two cosine signals of the same frequency with known frequency.

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Abstract

The invention relates to the field of signal processing, in particular to a method for self-adaptive unbiased phase difference estimation under the frequency mismatching condition. The method is suitable for measuring the phase difference of any two paths of same-frequency cosine signals. The method includes the following steps that firstly, frequency estimation values of the two paths of signals are acquired, frequency signals are constructed to estimate the two paths of cosine signals, and two paths of error signals are generated; then, self-adaptive estimation is conducted on parameters of the two paths of cosine signals by using the two paths of error signals, and parameter estimation values are obtained; finally, the phase difference of the two paths of cosine signals is calculated by using the obtained parameter estimation values of the two paths of cosine signals. According to the method for phase difference measurement, the structure is simple, the operability is high, better anti-noise performance is achieved, an unbiased phase difference estimation result can be obtained, and the influence of signal frequency mismatching on phase difference measurement can be effectively overcome.

Description

technical field [0001] The invention relates to the field of signal processing, in particular to an adaptive unbiased phase difference estimation method for two channels of cosine signals of the same frequency under the condition of frequency mismatch. Background technique [0002] The estimation method of phase difference is widely used in power system, smart instrument, fault diagnosis, electronic communication and other fields. For example, Coriolis mass flowmeter, which is widely used in oil and gas storage and transportation engineering, measures The mass flow depends on the measurement accuracy of the phase difference of the two cosine signals; another example, the determination of the power factor in the power system depends on the estimated value of the phase difference between the voltage and the current. Therefore, it is particularly important to realize high-precision measurement of phase difference. The existing phase difference estimation methods mainly include...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R25/00
CPCG01R25/005
Inventor 李明涂亚庆张海涛刘波沈廷鳌沈艳林张政丰
Owner LOGISTICAL ENGINEERING UNIVERSITY OF PLA
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