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A multi-frequency dynamic analysis method for bridge deformation based on combined differential GNSS

An analysis method and bridge technology, applied in the direction of electric/magnetic solid deformation measurement, electromagnetic measuring device, instrument, etc., to achieve good results in ensuring monitoring analysis and safety monitoring

Active Publication Date: 2020-09-18
CHINA ACAD OF TRANSPORTATION SCI +1
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Problems solved by technology

[0007] The purpose of the present invention is to provide a multi-frequency dynamic analysis method for bridge deformation based on combined differential GNSS, so as to solve the aforementioned problems existing in the prior art

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  • A multi-frequency dynamic analysis method for bridge deformation based on combined differential GNSS
  • A multi-frequency dynamic analysis method for bridge deformation based on combined differential GNSS
  • A multi-frequency dynamic analysis method for bridge deformation based on combined differential GNSS

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[0051] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are only used to explain the present invention, and are not intended to limit the present invention.

[0052] The constellation layout of the Beidou satellite navigation system has five geostationary orbit satellites (GEO) in addition to medium earth orbit satellites (MEO). As the main star, its stability is better than that of the main star selected by the maximum elevation angle or the maximum signal-to-noise ratio, which can effectively improve the calculation accuracy. Experts and scholars at home and abroad have conducted research and simulation tests on the combined GNSS system, and believe that the combined system can effectively solve the problem of satellite signal occlusion and eliminate ...

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Abstract

The invention discloses a bridge deformation multi-frequency dynamic analysis method based on a combined differential GNSS, and relates to the technical field of bridge deformation monitoring. A bridge GNSS monitoring signal is processed by using an orthogonal wavelet fast decomposition algorithm, an analysis signal is separated on different bands and multi-scale analysis is performed on a deformation signal; the instant displacement of the bridge under the effect of wind, vehicle passage or other earthquake disaster and external force is analyzed by using a high frequency signal, and the deformation trajectory of the dynamic deformation body of the bridge is analyzed by using a low frequency signal after noise reduction; and finally the bridge deformation trend is further analyzed by using the analysis result. Therefore, the characteristics of different frequencies in the GNSS monitoring signal are analyzed so that the static response and the dynamic response of the bridge can be effectively decomposed, the reason of bridge deformation caused by the three-dimensional displacement change of the bridge cannot be judged in the present bridge monitoring system can be solved, subsequent monitoring analysis can be effectively guaranteed and safety monitoring of the bridge can be greatly guaranteed.

Description

technical field [0001] The invention relates to the technical field of bridge deformation monitoring, in particular to a multi-frequency dynamic analysis method for bridge deformation based on combined differential GNSS. Background technique [0002] The GPS positioning system has become a revolutionary change in the surveying discipline due to its high flexibility in positioning and high precision unmatched by conventional surveying techniques. With the improvement of GPS positioning accuracy and high sampling frequency, it provides the possibility of real-time or quasi-real-time displacement monitoring of buildings. Due to the limitation of GPS single-point positioning accuracy, it is currently used in high-precision building displacement monitoring, and GNSS monitoring is usually used. [0003] The basic working principle of differential GNSS is as follows: figure 1 As shown, it is mainly to use different receivers in the same area to eliminate four kinds of error compo...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B7/16G01S19/14
CPCG01B7/16G01S19/14
Inventor 王里王哲陈建华刘玲程晓光郭磐石
Owner CHINA ACAD OF TRANSPORTATION SCI
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