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On-ice seismic source positioning method based on bending waves

A seismic source location and bending wave technology, applied in positioning, radio wave measurement systems, measuring devices, etc., can solve problems such as difficult to meet the positioning of polar airdrop materials, achieve the effect of large bending wave energy and reduce the impact of environmental factors

Pending Publication Date: 2021-11-23
HARBIN ENG UNIV
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Problems solved by technology

[0004] In summary, the existing seismic source location methods are difficult to meet the needs of polar ice source location, such as polar airdrop material location, ice vehicle tracking, and submarine icebreaking position estimation.

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  • On-ice seismic source positioning method based on bending waves
  • On-ice seismic source positioning method based on bending waves
  • On-ice seismic source positioning method based on bending waves

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Embodiment Construction

[0028] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0029] figure 1 It is a schematic flowchart of a method for locating ice impact signals provided by the present invention. In view of the huge difference between the vertical thickness and horizontal size of polar sea ice, based on the sound propagation characteristics of the ice layer, combined with the advantages of large ice bending wave energy and easy detection, the Hilbert-Huang transform time-frequency analysis method was used to extract Flexural-wave dispersion curves to obtain the group velocity of flexural-wave propagation. Make full use of the dispersion characteristics of flexural waves, and calculate the source distance through the arrival time and wave velocity difference of different frequency acoustic energy of flexural waves; combine the positions of the three geophones and the calculated three distances, and use the...

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Abstract

The invention provides an on-ice seismic source positioning method based on bending waves, and the method comprises the steps: extracting a bending wave frequency dispersion curve through employing a Hilbert-Huang transform time-frequency analysis method based on the characteristics of ice layer sound propagation based on the huge difference between the vertical thickness and the horizontal size of polar sea ice, and combining the advantages of large energy and easy detection of the bending waves of the ice layer, and acquiring the bending wave propagation group velocity. The frequency dispersion characteristic of the bending wave is fully utilized, and the focus distance is calculated through the arrival time and wave velocity difference of sound energy of different frequencies of the bending wave; and the positions of the three detectors and the calculated three distances are combined, and the position of the seismic source can be estimated by using a geometrical relationship. The invention provides the on-ice seismic source positioning method aiming at the acoustic propagation characteristics in the polar region environment and polar region sea ice so as to meet the economic development and potential target positioning requirements in the arctic region.

Description

technical field [0001] The invention relates to a seismic source positioning method, in particular to a bending wave-based seismic source positioning method on ice, and belongs to the technical field of polar acoustics. Background technique [0002] The seismic source location method refers to the technology of determining the location and distance of the seismic source based on the difference in arrival time and propagation speed of different elastic waves by using the corresponding waveform signal recorded by the sensor. Conventional seismic source location methods are all based on body waves (such as P waves and S waves). For example, in the latest invention patent of similar technology published in 2021, "A Ground Microseismic Location Method and System Combined with Inversion of Seismic Source Mechanism" is based on body wave velocity model and amplitude inversion of source location; other acoustic positioning methods such as "One A Sound Source Localization Method Bas...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S5/22
CPCG01S5/22Y02A90/30
Inventor 张宇翔高家辉张浩男马丁一谢志南殷敬伟生雪莉
Owner HARBIN ENG UNIV
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