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Far-field hypocenter rapid positioning method without pre-measuring speed

A technology without prediction speed and positioning method, applied in seismic signal processing, etc., can solve problems such as insufficient solution speed and efficiency, affecting solution stability and speed, and accuracy affecting positioning accuracy, etc.

Inactive Publication Date: 2015-11-04
CHINA UNIV OF MINING & TECH +1
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Problems solved by technology

At present, most of the vibration source positioning methods used at home and abroad are based on the pre-determined average velocity or the average velocity model. Therefore, when positioning on the spot, the accuracy of the average velocity measurement directly affects the positioning accuracy.
[0004] At present, the time difference of arrival positioning method using a two-dimensional function as the optimization target is the most commonly used method for vibrating source positioning without pre-velocity measurement. Continuous oscillation will occur near the convergence domain, which seriously affects the stability and speed of the solution

Method used

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  • Far-field hypocenter rapid positioning method without pre-measuring speed
  • Far-field hypocenter rapid positioning method without pre-measuring speed
  • Far-field hypocenter rapid positioning method without pre-measuring speed

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Embodiment 1

[0038] Assuming that the geophone coordinates are (970,0), (980,0), (990,0), (1000,0), the source coordinates are (600,1000), and the wave velocity is 3000m / s, which can be obtained by numerical calculation, Time difference between the detectors t 21 =1.170400ms, t 32 =1.197628ms, t 43 =1.224583ms. Take this example to explain in detail the two-dimensional positioning problem. In actual positioning, the known quantities are the coordinates of the four geophones and the time when the sensor triggers the recording. The location of the microseismic source is unknown. The reason given here is to pass this The method proposed by the invention is verified. The specific implementation steps are as follows:

[0039] 1. List the coordinate values ​​of the four geophones: (970,0), (980,0), (990,0), (1000,0);

[0040] 2. List the arrival time difference t between the detectors obtained after acquisition and processing 21 = 1.170400ms, t 32 =1.197628ms, t 43 =1.224583ms;

[0041] 3. The stand...

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Abstract

The objective of the invention is to provide a far-field hypocenter rapid positioning method without pre-measuring speed. A new mathematical model is put forward on the basis of a classic TDOA positioning method. An optimization searching objective function is constructed by the asymptotic line of a hyperbolic curve by using a dimension reduction mode under the condition that wave speed is unknown so that convergence of which the optimal solution can be rapidly stabilized can be obtained, and thus the coordinate position of a hypocenter can be rapidly obtained.

Description

Technical field [0001] The invention relates to the field of industrial monitoring and positioning, in particular to a fast positioning method suitable for far-field microseismic sources in a homogeneous medium environment, and is suitable for industrial monitoring and positioning systems using vibration waves, acoustic waves, and electromagnetic waves as transmission media in coal mines and oil wells. Background technique [0002] Microseismic monitoring technology is an important means of predicting coal mine disasters. The study found that the frequency and energy distribution of vibration activities are closely related to mine dynamic disasters such as underground rock bursts, coal and gas outbursts. Coal mine microseismic monitoring is the application of microseismic monitoring technology in coal mines to record the frequency, energy, waveform and other information of vibration activities, use the seismic wave to record the first arrival time information to locate the locati...

Claims

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Application Information

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IPC IPC(8): G01V1/28
Inventor 丁恩杰陈卿吕雅洁郎佳敏胡东平
Owner CHINA UNIV OF MINING & TECH
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