Method for extracting dynamic deflection of high-speed rail bridge in real time by accelerometer assisted GNSS
An accelerometer and acceleration technology, applied in the field of signal processing, can solve problems such as poor reliability, insufficient monitoring accuracy, and high cost
Pending Publication Date: 2020-10-02
CHINA UNIV OF MINING & TECH
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Problems solved by technology
[0005] Due to high rigidity bridges such as high-speed rail bridges have high requirements on the vertical deflection of the beam body, traditional GNSS dynamic positioning technology has problems such as insufficient monitoring accuracy, poor reliability and high cost when monitoring bridges such as high-speed rail bridges
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[0047] In order to make the purpose, technical solution and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present application, and are not intended to limit the present application.
[0048] Reference herein to an "embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the present application. The occurrences of this phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is understood explicitly and implicitly by those skilled in the art that the embodiments described herein can be combined with other embodiment...
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The invention discloses a method for extracting dynamic deflection of a high-speed rail bridge in real time through an accelerometer assisted GNSS. The method comprises the steps: collecting multi-system GNSS monitoring data and acceleration data on a high-speed rail bridge, establishing a single-difference residual error sequence and a multi-path error model, correcting the data of a next multi-path repetition period, and eliminating the influence of multi-path errors on GNSS positioning results; aiming at the extraction of high and low frequency dynamic displacement, carrying out the correlation analysis through a GNSS displacement sequence and an acceleration displacement sequence, extracting a low frequency displacement component, and finally, reconstructing the low frequency displacement component and the acceleration displacement sequence to obtain an overall dynamic displacement sequence of the high-speed rail bridge. According to the invention, the GNSS displacement positioningprecision is effectively improved, the acceleration data assists GNSS data to effectively separate high-low frequency displacement of the high-speed rail bridge, and more accurate overall dynamic displacement of the high-speed rail bridge can be obtained; and dynamic displacement monitoring of the high-speed rail bridge can be realized efficiently and accurately in real time.
Description
technical field [0001] The invention relates to the technical field of signal processing, in particular to a method for real-time extraction of dynamic deflection of high-speed railway bridges by assisting GNSS with an accelerometer. Background technique [0002] In order to ensure the operation safety of high-speed railways, the entire line of high-speed railways adopts a closed traffic mode, and bridges account for a large proportion of high-speed railway lines. Among them, super-large bridges across rivers (railway bridges with a length of more than 500 meters) are the key nodes for the safe operation of high-speed railways. These bridges have huge investment and play a pivotal role in the sustainable development of society and national economy. The outstanding problem at present is that the construction speed of many large bridges is too fast, and the design regulations and assumed structural design parameters have not been fully and completely checked; in addition, geol...
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IPC IPC(8): G01B7/16
CPCG01B7/16
Inventor 张秋昭高兴旺张书毕郑南山
Owner CHINA UNIV OF MINING & TECH