A Method of Monitoring Bridge Longitudinal Displacement and Deformation Based on psi Technology

Abstract

The present invention proposes a method for monitoring the longitudinal displacement and deformation of bridges based on PSI technology, the steps are as follows: S1, obtaining SCL image data and satellite precision orbit data; S2, determining the public master image, and registering the slave image with the master image; S3 , Use the satellite precise orbit data and GCP to correct the registration results; S4, remove the flattening effect on the generated interferogram; S5, check whether the registration accuracy is up to standard, and automatically extract PS points after reaching the standard; S6, perform the first PS inversion , to remove the offset phase of the interferogram; S7, perform the second PS inversion, remove the atmospheric phase based on the Nyquist sampling theorem and Gaussian smoothing filter method; S8, estimate the deformation rate and deformation accuracy, and perform geocoding; S9, The estimated deformation is converted into the longitudinal displacement of the bridge according to the imaging geometry. The method of the invention overcomes the defects of the "point" data collection method, and can monitor the bridge in all directions without being affected by atmospheric transmission and climate images, and has millimeter-level measurement accuracy.

Description

technical field [0001] The invention relates to a method for monitoring the longitudinal displacement of a bridge in real time, and belongs to the technical field of civil engineering deformation monitoring. Background technique [0002] In the 40 years since the reform and opening up in 1978, a large number of bridges have been built in my country. According to the "Unified Standard for Reliability Design of Building Structures" issued in 2000 on the design service life of buildings, GB50068 stipulates that the design reference period of bridges in my country is 100 years. Design service life: 30 years for small bridges, 50 years for medium bridges, and 100 years for large bridges. However, in fact, the bridge is subjected to the long-term effects of the natural environment and traffic loads during its use. Damage and disease occur in various parts of the structure, and the function of use is reduced. The actual service life often does not reach the design life. Therefore, ...

AI Technical Summary

Problems solved by technology

[0007] In order to solve the problems of the traditional bridge displacement detection method, such as the limited number of sensors, incomplete monitoring information, and high monitoring cost, as well as the problem that the existing PSI technology ignores the atmospheric phase image, this invention proposes a bridge longitudinal displacement and deformation monitoring method based on PSI technology. method, the selected PS points are densely distributed, which is conducive to the data processing of PS-InSAR, and in the second inversion, the atmospheric phase is eliminated by using the Nyquist sampling theorem and Gaussian smoothing filter method to improve the accuracy of deformation monitoring

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