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Full phase time shift phase difference spectrum correction method

A spectrum correction and all-phase technology, which is applied in the field of spectrum analysis, can solve problems such as spectrum leakage, affecting spectrum correction accuracy, and inter-spectrum interference, achieving the effect of high phase estimation accuracy and saving the amount of calculation

Inactive Publication Date: 2007-07-11
TIANJIN UNIV
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Problems solved by technology

[0007] 2. Defects of traditional frequency, phase and amplitude measurement algorithms based on FFT spectrum analysis
[0009] However, the correction accuracy of these spectrum correction methods is not as high as that of the "full phase time shift and phase difference spectrum correction method" described in this patent. The biggest reason is that these spectrum correction methods are all carried out under the framework of traditional FFT. Traditional FFT There is a large spectrum leakage phenomenon in the spectrum. The spectrum leakage of each frequency will cause the problem of inter-spectrum interference. The existence of inter-spectrum interference will affect the final spectrum correction accuracy.

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  • Full phase time shift phase difference spectrum correction method

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Embodiment Construction

[0034] The present invention will be further described below in conjunction with the accompanying drawings and examples.

[0035] Use the all-phase FFT spectrum analysis method to analyze the frequency spectrum of two sequences with a delay relationship, and then use the time-shift phase difference method to correct the results of the two phase spectrum analysis, and the frequency correction accuracy can reach 10 -10 resolution level.

[0036] 1. All-phase FFT spectrum analysis process

[0037] For the full-phase spectrum analysis, please refer to literature [8], and its general process is shown in Figure 1.

[0038] As can be seen from Figure 1, only a convolution window w of length (2N-1) is required c Weight the (2N-1) data before and after the central sample point x(0), then overlap and add the weighted data with an interval of N to form N data, and then perform FFT with N points to get the full phase spectrum Analyze the results. The convolution window in Figure 1 is ...

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Abstract

This invention relates to one complete phase time displacement different frequency spectrum correction method, which measures the signal frequency rate, phase bit, range value parameters with high accuracy to make phase meter, frequency meter and spectrum analyzer, laser distant devices. The invention adopts technique key by use of whole phase FFT frequency spectrum analyze method for two existent lag relationship frequency spectrum to correct the analyze results by time displacement difference method and two time phase spectrum analyze results.

Description

technical field [0001] The invention belongs to the field of frequency spectrum analysis in the telecommunication technology, and in particular relates to a method for correcting frequency spectrum of all phase time shift and phase difference. Background technique [0002] 1. Frequency, phase, and amplitude measurement of signals are common problems in industrial applications [0003] In applications such as electric power, sonar, railway, communication, geological exploration, and speech processing, there are a large number of signal frequency measurement and estimation problems. It should be pointed out that in many occasions that require precise measurement of other physical quantities, frequency measurement also plays a central role. For example, in the continuous wave radar speed measurement system, in order to identify the real-time running speed of the moving target, it is necessary to realize the reflection of the radar to the target. The frequency of the signal ret...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26H04B1/707H04L1/24G01R23/16
Inventor 王兆华黄翔东
Owner TIANJIN UNIV
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