Monitoring method for large railroad bridge health based on PSI
A technology for bridge health monitoring and railways, which is used in measurement devices, radio wave measurement systems, and radio wave reflection/re-radiation. It can solve problems such as failure to form correlation and real-time feedback of deformation information.
Active Publication Date: 2018-01-23
HOHAI UNIV
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Problems solved by technology
The manual on-site monitoring method is mainly a periodic manual monitoring on site, which is highly subjective and cannot feed back deformation information in real time
The displacement sensor monitoring method is mainly to install sensors on each movable support to monitor deformation, which can store real-time monitoring information, but the sensor can only monitor the individual information of each support separately, and cannot form the correlation among them.
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[0102] In order to make the technical means, creative features, goals and effects achieved by the present invention easy to understand, the present invention will be further described below in conjunction with specific embodiments.
[0103] A kind of PSI-based large-scale railway bridge health monitoring method of the present invention comprises the following steps:
[0104] (1) Obtain time series SAR images;
[0105] (2) Generate a redundant interferogram network;
[0106] (3) Use the SRTM3DEM model to remove the terrain phase;
[0107] (4) Select the pixel whose amplitude dispersion index is less than 0.2 as the permanent scatterer pixel;
[0108] (5) Based on the redundant interferogram network, the minimum cost flow method is used for phase unwrapping;
[0109] (6) Select the stable point pixel as the deformation reference point, as the spatial reference, and take the initial imaging moment of this pixel point as the time reference;
[0110] (7) Geometric decomposition...
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The invention discloses a monitoring method for large railroad bridge health based on PSI. The method comprises the following steps: (1) acquiring a time sequence SAR image; (2) generating a redundantinterference pattern network; (3) adopting an SRTM3 DEM model for removing a terrain phase; (4) roughly selecting and finely selecting a coherent target, thereby acquiring a permanent scattering PS point in the area; (5) utilizing a minimum cost flow method to unwrap the phase; (6) selecting a stable point pixel as a deformation reference point and taking the initial imaging moment of the pixel point as a time reference; (7) geometrically decomposing the radar visible light deformation; (8) converting the radar visible light deformation into the bridge longitudinal displacement; (9) establishing a linear regression model of the bridge longitudinal displacement and imaging moment temperature; (10) resolving a deformation quantity monitoring section. According to the invention, the influence of the thermal expansion on the displacement of the steel structure bridge is considered, the monitoring cost is saved, the working efficiency is increased and the measuring precision is high.
Description
technical field [0001] The invention relates to a large-scale railway bridge health monitoring method based on PSI (PSI refers to permanent scatterer satellite interference synthetic aperture radar technology), and belongs to the technical field of microwave remote sensing measurement. Background technique [0002] In order to reduce the time decoherence caused by the change of surface scattering characteristics during the two imaging periods and the space decoherence caused by the long space baseline, the permanent scatterer satellite interferometric synthetic aperture radar (PS-InSAR) technology came into being. A rapidly developing new technology for radar microwave remote sensing measurement. At the same time, it has the advantages of flexible use, stable platform, high resolution, and continuous acquisition of high-resolution deformation information around the clock. At present, there have been extensive research and applications in the field of deformation monitoring ...
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Login to View More IPC IPC(8): G01S13/90G01B15/06
Inventor 黄其欢葛陈豪王一安
Owner HOHAI UNIV