Bridge deformation close range monitoring method based on foundation InSAR

A bridge and deformation technology, which is applied in the field of short-distance monitoring of bridge deformation based on ground-based interferometric synthetic aperture radar, can solve the problems that the space cannot be realized, the inability to fully reflect the bridge deformation, early identification of bridge deformation and dynamic monitoring, etc., to achieve convenient The effect of maintenance

Inactive Publication Date: 2016-04-06
CHONGQING UNIV
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Problems solved by technology

Traditional deformation monitoring methods are almost based on "point" data collection methods, which cannot fully reflect the deformation of the bridge, and cannot realize the purpose of early identification and dynamic monitoring of bridge deformation in space. Therefore, there is an urgent need for a more Reliable method for long-term real-time monitoring of bridge health parameters

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  • Bridge deformation close range monitoring method based on foundation InSAR
  • Bridge deformation close range monitoring method based on foundation InSAR
  • Bridge deformation close range monitoring method based on foundation InSAR

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Embodiment Construction

[0022] Some computing methods involved in the present invention

[0023] 1. The principle of height measurement

[0024] Use two antennas with a certain viewing angle difference to acquire coherent SAR images in the same area, and then calculate the elevation value according to their interference phase, such as figure 2 shown.

[0025] 2. The relationship between bridge deformation and interferogram phase difference

[0026] Antenna A 1 and antenna A 2 represent the positions of the two antennas respectively, the distance between the antennas is represented by the baseline distance B, and the angle between the baseline and the horizontal direction is α. h represents the height between the antenna and the bottom surface of the bridge, P is the target point, R is P to the antenna A 1 The distance, R+ΔR is P to antenna A 2 , θ is the reference viewing angle of the first antenna, and the deformation of point P is represented by z.

[0027] Antenna A 1 and antenna A 2 The...

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Abstract

The invention discloses a bridge deformation close range monitoring method based on a foundation InSAR, belonging to the engineering measurement field. The method comprises: obtaining two pairs of SAR images before and after bridge deformation through an InSAR, performing coherence processing on the SAR images to obtain two phase coherence images before and after bridge deformation; and performing difference processing on the two SAR images, finally obtaining a differential phase, i.e., a deformation phase, and obtaining bridge deformation according to the deformation phase. The InSAR measurement technology is all-weather and full-time, and possesses the characteristics of high resolution and continuous space coverage; accordingly, the method overcomes the disadvantages of single-point measurement, low resolution and susceptibility to extraneous interference, and can perform real-time and long-term monitoring on a bridge, and provide basis and guidance for bridge maintenance and management decision.

Description

technical field [0001] The invention relates to a monitoring system, in particular to a short-distance monitoring method for bridge deformation based on ground-based interference synthetic aperture radar. Background technique [0002] Bridges, as one of the important infrastructures in our country, play a vital role in the development of the national economy. Once the safety of bridges cannot be fully guaranteed, it will have a negative impact on economic development. Moreover, with the progress of society and the development of science and technology, the bridge-building technology continues to improve, and the bridge structure gradually develops towards lightness and slenderness. Traditional deformation monitoring methods are almost based on "point" data collection methods, which cannot fully reflect the deformation of the bridge, and cannot realize the purpose of early identification and dynamic monitoring of bridge deformation in space. Therefore, there is an urgent nee...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/90
CPCG01S13/90G01S13/9023
Inventor 曹海林陶璐刘璟陈洲健朱澄卓
Owner CHONGQING UNIV
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