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A Method of Calculating Time Difference Based on Correlation

A correlation and correlation calculation technology, applied in the field of signal processing, can solve problems such as increasing system overhead, and achieve the effect of reducing errors

Inactive Publication Date: 2019-05-03
SOUTHWEST UNIVERSITY FOR NATIONALITIES
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Problems solved by technology

However, too high sampling rate will increase the overhead of the system

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  • A Method of Calculating Time Difference Based on Correlation
  • A Method of Calculating Time Difference Based on Correlation
  • A Method of Calculating Time Difference Based on Correlation

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Embodiment Construction

[0014] The present invention will be described below in conjunction with specific embodiments.

[0015] Let one of the two signals be sin(10*2π* t ), the second signal is sin(10*2π*( t +0.05)), that is, the frequencies of both signals are 10 Hz, the initial time of signal 1 is 0 seconds, the initial time of signal 2 is 0.05 seconds, and the time difference between signal 1 and signal 2 is -0.05 seconds. The process of adopting the present invention to calculate the time difference of these two signals is as follows:

[0016] Step 1: Set two different sampling periods of 1 / 30 second and 1 / 25 second respectively for these two signals, and these two sampling periods can be controlled by the absolute value of their difference 1 / 150 (ie 1 / 25- 1 / 30) seconds are divisible. The two signals are sampled, and the sampling time is 1 second, and the sampling sequence of signal 1 is obtained. S 1 As shown in the following table (due to the large amount of data, the data at the ellipsis...

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Abstract

The invention proposes a method for calculating time difference based on correlation. The traditional method of calculating the time difference based on correlation is to use the cross-correlation function to calculate the correlation between the two signals. The accuracy of the obtained time difference is related to the signal sampling rate. The higher the sampling rate, the higher the accuracy of the obtained time difference, but too high A higher sampling rate will increase the overhead of the system. To solve this problem, the invention makes the sampling period of the two signals unequal and can be divisible by the difference between them, and uses a new formula to calculate the correlation and time difference of the two signals. By adopting the method of the invention, the accuracy of the time difference obtained can be improved without increasing the sampling rate.

Description

technical field [0001] The invention belongs to the field of signal processing, in particular to a method for calculating time difference based on correlation. Background technique [0002] The cross-correlation function is a common method to calculate the correlation between two signals, and its calculation formula is ,in S 1 and S 2 is the sampling sequence of the two signals, m and n are integers. The cross-correlation function is often used to analyze the time difference between two signals, such as: "Simulation analysis of passive time-difference positioning technology based on signal cross-correlation" ("Electronic Information Countermeasure Technology" 2010 No. 2, P49-54) in the multi-station In passive positioning, the cross-correlation function is used to extract the signal time difference between stations; the literature "Cross-correlation time difference analysis technology and its application——taking the continuous processing of 3D seismic data in Shengli...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/50
CPCG06F30/20G06F2119/12
Inventor 胡建
Owner SOUTHWEST UNIVERSITY FOR NATIONALITIES
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