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Bridge permanent deformation analysis method based on ps-insar technology

An analysis method and permanent deformation technology, applied in the direction of radio wave reflection/re-radiation, instruments, measuring devices, etc., can solve problems such as difficult implementation, affecting real-time monitoring, and affecting normal operation of bridges

Active Publication Date: 2021-12-17
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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Problems solved by technology

However, the traditional bridge safety monitoring method is mainly based on manual on-site measurement of a single bridge, which usually needs to close the road and bridge, which affects the normal operation of the bridge, and it is difficult to implement in special areas and special climates, thus affecting the monitoring real-time

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  • Bridge permanent deformation analysis method based on ps-insar technology
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Embodiment Construction

[0037] Attached below Figure 1-10 The bridge permanent deformation analysis method based on PS-InSAR technology of the present invention is described in detail.

[0038] The present invention is based on the bridge permanent deformation analysis method of PS-InSAR technology, comprises the following steps:

[0039] 1) Obtain the same area of ​​the ground at different times (t 1 ,t 2 ,...,t n ) and N SAR images under similar orbital geometry;

[0040] 2) Generate M interferograms from the N SAR effects obtained in step 1) and register them to the same geometry for phase unwrapping, select P permanent scatterers, that is, PS points, and calculate these PS points at different times deformation information;

[0041] 3) If the interferogram uses the i-th SAR image as the main image, and the j-th SAR image is a complex image, the phase model of the interferometric phase is established, and the unwrapped phase of the pixel x is expressed as follows:

[0042]

[0043] Among ...

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Abstract

The invention discloses a bridge permanent deformation analysis method based on PS‑InSAR technology. According to the statistical laws of bridge live loads (temperature loads and random traffic loads) under different weather modes, artificial PS points are set on the key deformation points of the target bridge. , using the Monte Carlo method-finite element simulation technology to give the space-time matrix of random deformation values ​​of key deformation points of the target bridge under different weather modes. Then, according to the moment when the satellite shoots the SAR image, match the random deformation value space-time matrix under the corresponding weather mode, and obtain the random deformation difference caused by the live load change of the bridge during the main and slave SAR image interference process, so as to extract from the PS-InSAR-based technology This random deformation difference is eliminated from the deformation information of the bridge to obtain the permanent deformation of the bridge, which provides a strong data support for the health and safety of the bridge.

Description

technical field [0001] The invention relates to the technical field of bridge monitoring, in particular to a bridge permanent deformation analysis method based on PS-InSAR technology. Background technique [0002] Bridges are the link to ensure the smooth flow of roads and railways, the throat of land transportation, and play a pivotal role in economic and social life. my country is a big country of bridges, with 735,000 existing bridges, and the tasks of monitoring, maintenance and management of existing bridges are gradually increasing. According to the 2008 China Traffic Yearbook, the number of dangerous bridges in the country is about 98,623, the length is about 30.687 million meters, and the percentage of dangerous bridges is about 17.3%. Road bridges account for a large proportion of bridges with diseases. [0003] In order to ensure the normal operation of bridges and avoid casualties and property losses, it is a very urgent and necessary task to give a correct evalu...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S13/90
CPCG01S13/90G01S13/9005G01S13/9023
Inventor 张华戴进潘军赵冰李清鑫邹辉
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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