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Signal amplitude spectrum detecting method and system based on dot frequency filter

A detection method and detection system technology, applied in the field of signal processing, can solve problems such as resolution reduction, and achieve the effect of high signal amplitude spectrum resolution and excellent signal amplitude spectrum analysis characteristics

Active Publication Date: 2015-01-07
ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Signal plus window function processing can significantly improve the spectral leakage problem of the rectangular window, but at the same time, it will largely cause the decrease of the frequency domain amplitude spectrum resolution of the signal

Method used

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  • Signal amplitude spectrum detecting method and system based on dot frequency filter
  • Signal amplitude spectrum detecting method and system based on dot frequency filter
  • Signal amplitude spectrum detecting method and system based on dot frequency filter

Examples

Experimental program
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Effect test

Embodiment 1

[0024] Such as figure 1 As shown, it is a schematic flow diagram of a signal amplitude spectrum detection method based on a dot frequency filter in Embodiment 1 of the present invention, which includes the following steps:

[0025] S11. Receive an input signal, and obtain the original data sequence of the input signal;

[0026] According to the preset signal sampling frequency, the input signal is sampled according to the preset signal time length to obtain the original data sequence.

[0027] S12. Select an integer data sequence from the original data sequence according to a preset length of the sorted data sequence to obtain a sorted data sequence;

[0028] Ideally, the time length corresponding to the length of the original data sequence N is an integral multiple of the period length of the dot frequency ωo, but in fact it is not satisfied in most cases. In order to adapt to the actual situation, the original data sequence must be sorted, that is, according to the point frequency ω...

Embodiment 2

[0054] Such as figure 2 As shown, it is a schematic flowchart of the second embodiment of a signal amplitude spectrum detection method based on a dot frequency filter of the present invention, which includes the following steps:

[0055] S201: Set a preset signal time length;

[0056] Signal analysis requires a certain length of time, and different systems have different requirements for the length of time. It can be set according to actual needs. For example, the time length of 0.2s can be used for harmonic analysis of power systems.

[0057] Use T to express and set the preset signal time length, in s.

[0058] in image 3 In the schematic diagram shown, the preset signal time length is set to 0.1s.

[0059] S202: Set a preset signal sampling frequency;

[0060] In principle, the signal sampling frequency can be 2 times the upper limit of the highest analysis frequency range. However, in order to obtain good amplitude spectrum analysis characteristics or reduce the problem of spectrum...

Embodiment 3

[0115] Such as Figure 5 Shown here is a signal amplitude spectrum detection system based on a dot frequency filter of the present invention, which includes:

[0116] The receiving module 51 is configured to receive an input signal and obtain the original data sequence of the input signal;

[0117] According to the preset signal sampling frequency, the input signal is sampled according to the preset signal time length to obtain the original data sequence.

[0118] The selection module 52 is configured to select an integer data sequence from the original data sequence according to a preset length of the sorted data sequence to obtain a sorted data sequence;

[0119] Ideally, the time length corresponding to the original data sequence length N is the point frequency ω o An integral multiple of the period length, but in fact it is not satisfied in most cases. In order to adapt to the actual situation, the original data sequence must be sorted, that is, according to the point frequency ω ...

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Abstract

The invention provides a signal amplitude spectrum detecting method and system based on a dot frequency filter. The method comprises the steps that input signals are received, and an original data sequence of the input signals is obtained; an integer data sequence is selected from the original data sequence according to a preset disposal data sequence length, and a disposal data sequence is obtained; the disposal data sequence is output in a circulating mode, a circulating disposal data sequence is obtained, and when the circulating output length of the disposal data sequence reaches the preset data sequence length, the circulating output of the disposal data sequence stops; dot frequency filter filtering is carried out on the circulating disposal data sequence according to preset dot frequency, and dot frequency filtering data are obtained; amplitude detection is carried out on the dot frequency filtering data, and the signal frequency domain amplitude spectrum of the original data sequence under the dot frequency is obtained. Spectrum leakage cannot happen to the signal amplitude spectrum detected through the method, and the signal frequency domain amplitude spectrum resolution ratio is high.

Description

Technical field [0001] The present invention relates to the technical field of signal processing, in particular to a signal amplitude spectrum detection method based on a spot frequency filter and a signal amplitude spectrum detection system based on a spot frequency filter. Background technique [0002] The amplitude spectrum analysis of signal frequency domain has a wide range of applications. Although the Fourier transform algorithm is one of the effective means to realize the calculation of the signal from the time domain to the frequency domain, it also has certain limitations, such as the problem of spectrum leakage. Signal plus window function processing can significantly improve the spectrum leakage problem of the rectangular window, but at the same time it largely causes a decrease in the signal frequency domain amplitude spectrum resolution. Summary of the invention [0003] Based on this, the present invention provides a signal amplitude spectrum detection method and sy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R23/16
Inventor 李军庞志强万文军
Owner ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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