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Method for measuring phase difference of low-frequency signals

A measurement method and low-frequency technology, which is applied in the field of phase difference measurement of low-frequency signals, and can solve problems such as inaccurate phase difference measurement accuracy

Inactive Publication Date: 2010-08-25
NANJING UNIV OF POSTS & TELECOMM
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  • Abstract
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Problems solved by technology

[0004] The main purpose of the present invention is to solve the inaccurate measurement accuracy of the phase difference of the low-frequency signal in the prior art, and propose a method for measuring the phase difference of the low-frequency signal

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  • Method for measuring phase difference of low-frequency signals
  • Method for measuring phase difference of low-frequency signals
  • Method for measuring phase difference of low-frequency signals

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Embodiment Construction

[0036] The technical scheme of the present invention is described in detail below in conjunction with accompanying drawing:

[0037] The essence of the present invention is to fit a straight line by several sampling points, and the sampling points selected should not be too many. If there are more sampling points selected, the calculation will be complicated; If the number of sampling points is small, it is easily affected by interference. Therefore, users can select a reasonable combination and number of sampling points for calculation according to their needs.

[0038] In order to obtain more accurate measurement results, the suggested selection scheme of sampling points is: the number of positive sampling points is equal or approximately equal to the number of negative sampling points, and the number of sampling points can be determined according to the actual situation.

[0039] The features and advantages of the present invention will be described in detail by way of exa...

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Abstract

The invention provides a method for measuring a phase difference of low-frequency signals. The method has the fundamental principle that the time of the zero crossing points (the zero crossing points of the signals when being changed from a low point to a high point) of two paths or a plurality of paths of low-frequency signals is firstly calculated by a sampling value, then the periods of the signals are calculated by the zero crossing points, and finally, the phase difference between the signals is calculated by using the difference of the time of the zero crossing points of different signals and the periods of the signals. The invention does not need to convert the low-frequency signals into square waves, overcomes the defect of poor anti-jamming capability of the traditional zero crossing point detection, is especially suitable for the measurement of the phase difference of the low-frequency signals and has convenient system detection and small hardware expense; the anti-jamming capability of the system is stronger; and the invention is simple and reasonable to realize and has accurate and reliable data and more extensive application prospect.

Description

technical field [0001] The invention relates to a phase difference measurement technology for low-frequency signals, and the low-frequency signals include but not limited to civil alternating current. Background technique [0002] In daily life and production process, it is often necessary to measure the phase difference of low-frequency signals. The more accurate the measured phase difference is, the better the application effect is. In the existing phase difference measurement methods, most of them convert the signal into a square wave, and then measure the time difference between the rising edges of the two square waves, so as to obtain the phase difference of the two signals, but this algorithm is easy to implement but Requires additional hardware and is susceptible to interference. Contents of the invention [0003] Purpose of the invention: [0004] The main purpose of the present invention is to solve the inaccurate measurement precision of the phase difference of...

Claims

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Application Information

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IPC IPC(8): G01R25/00
Inventor 戴尔晗赵元正孙海安林玲
Owner NANJING UNIV OF POSTS & TELECOMM
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