A method for estimating the arrival time difference of cloud lightning pulse signal

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...

AI Technical Summary

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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