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Method for estimating thunder impulse signal Time Difference of Arrival (TDOA)

A technology of pulse signal and time difference, applied in the direction of electromagnetic field characteristics, etc., can solve the problems of large amount of calculation, false estimated value, difficult to determine the threshold, etc., and achieve the effect of low calculation amount, simple method, and easy engineering realization

Active Publication Date: 2013-02-13
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

If these methods are directly used to obtain the TDOA of lightning pulses, the disadvantage is that it is necessary to traverse all the lightning pulse signals received by each detection station, and the amount of calculation is very large, and because the correlation peak judgment threshold is not easy to determine, resulting in many false estimates
[0005] At present, there is no complete method and implementation process for estimating the arrival time difference of lightning pulse signals with high precision and robustness when locating cloud lightning radiation sources

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  • Method for estimating thunder impulse signal Time Difference of Arrival (TDOA)
  • Method for estimating thunder impulse signal Time Difference of Arrival (TDOA)
  • Method for estimating thunder impulse signal Time Difference of Arrival (TDOA)

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Embodiment Construction

[0029] The content and specific implementation of the present invention will be further described below in conjunction with the accompanying drawings.

[0030] figure 1 A method for forming homologous pulse queues and calculating the time difference between lightning signals arriving at any two detection stations in a cloud lightning and lightning positioning system composed of multiple detection stations and a central station is given. figure 2 The spatial geometric relationship between the lightning source and the two detection stations in the Cartesian coordinate system is given, image 3 The definition of the center of gravity of the envelope energy of the lightning signal is given, Figure 4 , Figure 5 and Figure 6 A schematic diagram of the principle of calculating the signal time difference of arrival (TDOA) based on the center of gravity of the envelope energy of two homologous pulses is given respectively.

[0031] Such as figure 1 As shown, the present invent...

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Abstract

The invention discloses a method for estimating thunder impulse signal Time Difference of Arrival (TDOA). The method comprises the following steps: carrying out splicing and waveform restoration on thunder impulse data blocks, and forming a thunder impulse cluster; inputting a time interval to extracting a thunder impulse cluster of each station; determining a reference detection station; calculating an impulse number of a thunder impulse cluster of A station; carrying out thunder impulse association and TDOA calculation; forming all homologous pulse pair arrays and TDOA arrays in a user assignment time interval; changing a time interval, carrying out calculation and forming new homologous pulse pair arrays and TDOA arrays. With regards to characteristics of a thunder impulse signal, the method in the invention is designed, a complete process of waveform association and homology determination, and Time Difference of Arrival (TDOA) estimation is provided, and the method is qualified toTDOA estimation requirement under white noise and color noise environments. According to the method, there is no need to look through all thunder impulses received by two detection stations, and the method has the characteristics of strong robustness, simplicity, reliability, high precision of a calculation result, and easy engineering realization.

Description

technical field [0001] The invention belongs to the research field of lightning monitoring and early warning technology, and relates to a cloud lightning detection and positioning system composed of a plurality of detection stations and a central station, accurately calculating the time difference between the arrival of lightning pulse signals at any two detection stations at the central station ( TDOA) approach. Background technique [0002] The location accuracy and spatial resolution of the lightning radiation source based on the direction of arrival (DOA) of the signal will decrease with the increase of the distance between the lightning radiation source and the detection station. In contrast, the positioning accuracy and spatial resolution of the lightning radiation source location technology based on signal time difference of arrival (TDOA) will be improved with the increase of the distance between the radiation source and the detection station (when the positioning do...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R29/08
Inventor 马洪罗冶郭妩君
Owner HUAZHONG UNIV OF SCI & TECH
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