Real-time monitoring rapid initialization method for bridge based on GNSS

An initialization method and real-time monitoring technology, which can be used in measurement devices, electromagnetic measurement devices, and electromagnetic/magnetic solid deformation measurement, and can solve problems such as initialization difficulties.

Active Publication Date: 2018-09-18
WUHAN UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the problem of difficult initialization caused by occlusion in real-time monitoring of bridges, the present invention provides a fast initialization method for real-time monitoring of bridges based on GNSS

Method used

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  • Real-time monitoring rapid initialization method for bridge based on GNSS
  • Real-time monitoring rapid initialization method for bridge based on GNSS
  • Real-time monitoring rapid initialization method for bridge based on GNSS

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Embodiment

[0174] In this embodiment, two measuring stations S028 and S007 with poor environment and one measuring station S029 with better environment are selected in the bridge monitoring. Among them, the measuring stations S028 and S007 are set at the box girder point of the bridge, and the measuring station S029 is set at the bridge tower. A total of 600 sets of observation data (including 10 epochs) of stations S028, S007, and S029 were used to fix ambiguity by using the method of the present invention and the conventional method, and the ambiguity fixation rate was compared. See image 3 , where Fig. (a), Fig. (b) and Fig. (c) are respectively the ambiguity fixed rate comparison diagrams of bridge box girder point S028 measuring station, bridge box girder point S007 measuring station, and bridge tower S029 measuring station. , FAR means to adopt the fixed strategy of full ambiguity search, PAR means to adopt the fixed strategy of partial ambiguity search, GPS means to use the conve...

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Abstract

The invention discloses a real-time monitoring rapid initialization method for a bridge based on GNSS, and the method comprises the steps: S100, constructing a double-difference observation equation on the respective frequencies of a Beidou tri-frequency signal; S200, linearizing the double-difference observation equation and constructing an error equation; S300, applying reference constraint on ato-be-estimated parameter through prior information, and weighting the double-difference observation equation through a random mode; S400, solving an error equation through a Kalman filter method, and obtaining a floating point solution estimation value of an ambiguity parameter; S500, carrying out the ambiguity search through an LAMBDA method based on a monitoring station coordinate estimation value and the floating point solution estimation value; S600, repeatedly executing the steps S400-S500 for the next epoch. According to the short baseline data processing characteristics of bridge deformation monitoring, the method employs the Beidou tri-frequency signal for building a superwide-band combined observation value with the wavelength of 4.88m, greatly improves the ambiguity fixing efficiency, and speeds up the initialization process in the real-time monitoring of the bridge.

Description

technical field [0001] The invention belongs to the technical field of bridge monitoring, in particular to a GNSS (Global Navigation Satellite System)-based bridge real-time monitoring rapid initialization method. Background technique [0002] At present, GNSS technology has been widely used in real-time bridge monitoring, and has become an effective means of bridge deformation and vibration monitoring. In the deformation monitoring system of large bridges at home and abroad, GPS has become an indispensable sensor. Its main advantage is that GPS technology relies on navigation satellites to provide observation signals, is not affected by the weather, and can work around the clock; the calculation result of a single epoch can reach a horizontal accuracy of 10mm and a vertical accuracy of 20mm, which can meet the requirements of low-frequency deformation of bridges in terms of accuracy; receiver sampling The rate currently supports up to 100Hz, which can realize bridge vibrat...

Claims

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Application Information

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IPC IPC(8): G01B7/16G01H11/00
Inventor 姜卫平席瑞杰周晓慧陈华陈渠森
Owner WUHAN UNIV
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