Low-frequency string-wave signal phase difference measurement method

A signal phase and difference measurement technology, applied in the direction of measuring devices, measuring electrical variables, phase angles between voltage and current, etc., can solve problems such as low measurement accuracy, complex circuit structure, and large volume

Inactive Publication Date: 2017-01-25
NORTHWEST UNIV(CN)
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Problems solved by technology

[0006] The embodiment of the present invention provides a method for measuring the phase difference of a low-frequency sine wave signal, which is used to solve the problems of complex circuit structure, large volume and low measurement accuracy in existing phase difference measuring instruments

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  • Low-frequency string-wave signal phase difference measurement method
  • Low-frequency string-wave signal phase difference measurement method
  • Low-frequency string-wave signal phase difference measurement method

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Embodiment Construction

[0035] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0036] figure 1 A flow chart of a method for measuring the phase difference of a low-frequency sinusoidal signal provided by an embodiment of the present invention, as shown in figure 1 As shown, a method for measuring the phase difference of a low-frequency sinusoidal signal provided by an embodiment of the present invention includes the following steps:

[0037] Step 101, digitally process the two channels of same-frequency sine wave signals that are collec...

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Abstract

The invention provides a low-frequency string-wave signal phase difference measurement method and belongs to the field of phase different measurement with an aim to solve problems that existing phase difference measurement is complex in circuit structure and low in measurement accuracy. The low-frequency string-wave signal phase difference measurement method includes: subjecting two same-frequency string-wave signals acquired synchronously to no-signifying processing to acquire a first signal and a second signal which are to be process in an FPGA (field programmable gate array); sequentially determining self-correlation measurement value of the first signal, self-correlation measurement value of the second signal and cross-correlation measurement value of the first and second signals; according to noise and signal correlation features, acquiring self-correlation theoretical value of the first signal, self-correlation theoretical value of the second signal and cross-correlation theoretical value of the first and second signals; according to amplitude of the two same-frequency string-wave signals, the self-correlation theoretical value, the self-correlation theoretical value, the cross-correlation theoretical value of the first and second signals and an arbitrary-angle function relation formula, determining the phase difference of the same-frequency string-wave signals.

Description

technical field [0001] The invention belongs to the technical field of phase difference measurement, and more specifically relates to a method for measuring the phase difference of a low-frequency sine wave signal. Background technique [0002] In the field of test and measurement technology, measuring the phase difference of low-frequency sinusoidal signals plays an important role in engineering. For example, the analysis and calculation of high-precision power parameters in grid electric energy metering involves the accurate measurement of the phase difference between the 50Hz power frequency voltage sine wave signal and the corresponding current signal. In the field of time-frequency reference measurement, the dual-mixing time-difference precision frequency measurement technology scheme widely used by domestic and foreign research institutions such as the China Metrology Institute, the US Jet Propulsion Laboratory, and GPS navigation satellites, also uses 5MHz or 10MHz a...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R25/00
CPCG01R25/00
Inventor 唐升王天翔雷浩丹邓智峰杨育婷王万恒
Owner NORTHWEST UNIV(CN)
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