Beidou three-frequency/static level cable-stayed bridge monitoring method based on position constraint

Abstract

The invention discloses a Beidou three-frequency / static level cable-stayed bridge monitoring method based on position constraint, relates to the technical field of bridge deformation monitoring. The method can effectively solve the problems in current cable-stayed bridge monitoring. Specifically, deformation can be restrained in the parallel direction of a bridge by utilizing the particularity ofbridge monitoring. Meanwhile, the advantage of real-time accurate monitoring of a static force level gauge in the aspect of measuring elevation is combined. The precision reaches up to 0.5 mm, displacement changes of the bridge body in the vertical direction are measured in real time, and second constraint is conducted on the direction perpendicular to the bridge floor. The Beidou three-frequencyreceiver can efficiently solve the position parameter and the ambiguity parameter of the receiver in real time by using the two constraint conditions, thereby solving the deformation of the bridge body.

Description

technical field [0001] The invention relates to the technical field of bridge deformation monitoring, in particular to a position-constrained Beidou triple-frequency / static level cable-stayed bridge monitoring method. Background technique [0002] As an important bridge type, the cable-stayed bridge is widely used in many long-span bridge projects. Compared with other ordinary girder bridges, arch bridges and steel bridges, the cable-stayed bridge The dynamic response is more prominent, and the bridge is under the action of environmental corrosion, material aging and increasing traffic volume, which leads to structural damage and functional degradation of the bridge. The double pressure makes the monitoring and diagnosis of the bridge, and the establishment of a damage assessment system in time And safety early warning measures become the inevitable requirements of future bridge construction. [0003] In the current research on bridge deformation monitoring, due to the limi...

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Problems solved by technology

[0004] With the continuous development of Beidou software and hardware, the Beidou receiver has a high sampling rate and can realize four-dimensional and all-weather monitoring, which makes the dynamic and static positioning accuracy of Beidou significantly improved. The measurement accuracy of Beidou dynamic monitoring technology is limited to 10-20mm. Therefore, many scholars at home and abroad have carried out key research on the combination of Beidou and other sensor technologies, including fiber grating sensors, accelerometers, laser measurements, static levels, etc. , but there are certain limitations. Fiber Bragg grating sensors generally use surface attachment or embedding to obtain local characteristic parameters, which can only achieve point or line measurement, and the displacement obtained by the accelerometer after the second integration will be less accurate. , and the quasi-static displacement with a long period of change cannot be obtained, and the measurement accuracy of laser measurement will decrease rapidly as the line-of-sight increases

[0005] In the deformation monitoring using Beidou, the whole cycle fixation of the ambiguity parameter N has always been a difficult problem, because deformation monitoring generally requires relatively high precision, and the output frequency is also relatively high, while the ambiguity fixation requires a high-precision first It is usually necessary to output the solution results in a single epoch, which poses a great challenge to the ambiguity fixed throughout the week. The ambiguity cannot be fixed throughout the week, and the output floating-point solution has low precision and is unreliable. Usually, it cannot Meet the accuracy requirements of deformation monitoring

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