Bridge Deformation Monitoring Based on High Precision Beidou Positioning

2020 ◽  
pp. 1086-1091
Author(s):  
Tianyu Luo
Keyword(s):  
High Precision ◽  
Deformation Monitoring

scholarly journals Fusion of GNSS and Speedometer Based on VMD and Its Application in Bridge Deformation Monitoring

Sensors ◽  
2020 ◽  
Vol 20 (3) ◽  
pp. 694 ◽  
Author(s):  
Ruicheng Zhang ◽  
Chengfa Gao ◽  
Shuguo Pan ◽  
Rui Shang
Keyword(s):  
Real Time ◽  
High Precision ◽  
High Frequency ◽  
Spectral Response ◽  
Low Frequency ◽  
Deformation Monitoring ◽  
Full Time ◽  
Dynamic Displacement ◽  
Mode Decomposition ◽  
Acceleration Sensors

Real-time dynamic displacement and spectral response on the midspan of Jiangyin Bridge were calculated using Global Navigation Satellite System (GNSS) and a speedometer for the purpose of understanding the dynamic behavior and the temporal evolution of the bridge structure. Considering that the GNSS measurement noise is large and the velocity/acceleration sensors cannot measure the low-frequency displacement, the Variational Mode Decomposition (VMD) algorithm was used to extract the low-frequency displacement of GNSS. Then, the low-frequency displacement extracted from the GNSS time series and the high-frequency vibration calculated by speedometer were combined in this paper in order to obtain the high precision three-dimensional dynamic displacement of the bridge in real time. Simulation experiment and measured data show that the VMD algorithm could effectively resist the modal aliasing caused by noise and discontinuous signals compared with the commonly used Empirical Mode Decomposition (EMD) algorithm, which is guaranteed to get high-precision fusion data. Finally, the fused displacement results can identify high-frequency vibrations and low-frequency displacements of a mm level, which can be used to calculate the spectral characteristics of the bridge and provide reference to evaluate the dynamic and static loads, and the health status of the bridge in the full frequency domain and the full time domain.

scholarly journals Research on Monitoring Method of Remote Deformation and System Application Based on Image

2021 ◽  
Vol 2021 ◽  
pp. 1-14
Author(s):  
Yu Zhang ◽  
Ruofei Zhong ◽  
Yongrong Li ◽  
Haili Sun
Keyword(s):  
Monitoring System ◽  
High Precision ◽  
Engineering Application ◽  
Deformation Monitoring ◽  
Image Feature ◽  
Deformation Analysis ◽  
Monitoring Cost ◽  
Scale Invariant ◽  
Monitoring Method ◽  
Reference Target

The development of information technology and computer science has put forward higher requirements on the intelligence of deformation monitoring. We study a method based on image deformation analysis, which uses Scale-Invariant Feature Transform (SIFT) to extract image feature points after preprocessing the acquired images, applies All-Pixels Matching (APM) method to the sequence images to do further high-precision matching to achieve the accuracy of subpixels, and finally solves the deformation variables according to the relationship of the real size of the reference target and its pixel. Wavelet analysis and least squares are used to improve the image quality and matching accuracy. Based on this method, we design and develop a new remotely automated deformation monitoring system. In this paper, we introduce the algorithm principle of deformation analysis, the integration of the system, and the engineering application example of the monitoring system. The monitoring accuracy of the system satisfying 0.1 mm within 10 m and 0.8 mm within 60 m is verified in the simultaneous comparison observation according to the high-precision total station, which illustrates the effectiveness of the present deformation analysis method and monitoring system and also has the characteristics of low monitoring cost and high degree of automation.

The Application of GPS for High Rise Building Deformation Monitoring During the Servicing Stage

2012 ◽  
Vol 226-228 ◽  
pp. 2115-2119
Author(s):  
Hou Tian Zhang ◽  
Lei Hu
Keyword(s):  
Data Processing ◽  
High Precision ◽  
Deformation Monitoring ◽  
Deformation Measurement ◽  
Site Conditions ◽  
High Rise ◽  
Fast Speed ◽  
High Rise Building ◽  
The City ◽  
Easy Operation

With the development of the city, there has more and more high rise buildings, people has serious attention on the security problems of the high rise buildings. Code for deformation measurement of building and structure asks that, deformation monitoring for high-rise building during service stage is necessary. During servicing stage of the high-rise building, owing to the change of site conditions, it is difficult to use former monitoring way. GPS plays a incomparable role in the deformation monitoring during the servicing stage for its advantages of high precision, fast speed and easy operation. This paper introduces the monitoring way and data processing of using GPS for high-rise building during servicing stage, using a example to prove that the application of GPS in deformation monitoring for high-rise building during servicing stage is feasible.

scholarly journals ULTRA-HIGH PRECISION UAV-BASED LIDAR AND DENSE IMAGE MATCHING

2018 ◽  
Vol XLII-1 ◽  
pp. 115-120 ◽  
Author(s):  
M. Cramer ◽  
N. Haala ◽  
D. Laupheimer ◽  
G. Mandlburger ◽  
P. Havel
Keyword(s):  
High Precision ◽  
Image Matching ◽  
Early Stage ◽  
Development Project ◽  
Deformation Monitoring ◽  
3D Data ◽  
Federal Institute ◽  
Dense Image ◽  
Engineering Geodesy ◽  
Project Data

<p><strong>Abstract.</strong> This paper presents a study on the potential of ultra-high accurate UAV-based 3D data capture. It is motivated by a project aiming at the deformation monitoring of a ship lock and its surrounding. This study is part of a research and development project initiated by the German Federal Institute of Hydrology (BfG) in Koblenz in partnership with the Office of Development of Neckar River Heidelberg (ANH). For this first official presentation of the project, data from the first flight campaign will be analysed and presented. Despite the fact that monitoring aspects cannot be discussed before data from additional flight campaigns will be available later this year, our results from the first campaign highlight the potential of high-end UAV-based image and LiDAR sensors and their data fusion. So far, only techniques from engineering geodesy could fulfil the aspired accuracy demands in the range of millimetres. To the knowledge of the authors, this paper for the first time addresses such ultra-high accuracy applications by combing high precision UAV-based LiDAR and dense image matching. As the paper is written at an early stage of processing only preliminary results can be given here.</p>

Development of Monitoring Open Mining Slope on TM30

2012 ◽  
Vol 446-449 ◽  
pp. 2947-2950
Author(s):  
Feng Yun Yang ◽  
Wen Zhao ◽  
Mao Lin Xu
Keyword(s):  
High Precision ◽  
High Efficiency ◽  
Deformation Monitoring ◽  
Measuring System ◽  
Total Station ◽  
Safety And Stability ◽  
Mining Slope ◽  
Robotic Total Station

Discuss monitoring way of slope sliding of ANGANG open mine on Robotic Measuring System TM30 technology and processing data’s method, according to survey speciafication of deformation observation, analyses deformation result and compares it with speciafication of deformation observation, reports it to the mine company to insure safety and stability of mine produce. Deformation monitoring on Robotic total station TM30 that is Observation flexible, high precision and high efficiency is worth spreading.

scholarly journals On the Efficacy of Compact Radar Transponders for InSAR Geodesy: Results of Multi-year Field Tests

2021 ◽  
Author(s):  
Richard Czikhardt ◽  
Hans van der Marel ◽  
Juraj Papco ◽  
Ramon Hanssen
Keyword(s):  
Time Series ◽  
Surface Temperature ◽  
High Precision ◽  
Deformation Monitoring ◽  
Seasonal Effects ◽  
Attractive Alternative ◽  
Leg Length ◽  
Short Baseline ◽  
Wide Range ◽  
The Impact

Compact and low-cost radar transponders are an attractive alternative to corner reflectors (CR) for SAR interferometric (InSAR) deformation monitoring, datum connection, and geodetic data integration.Recently, such transponders have become commercially available for C-band sensors, which poses relevant questions on their characteristics in terms of radiometric, geometric, and phase stability. Especially for extended time series and for high-precision geodetic applications, the impact of secular or seasonal effects, such as variations in temperature and humidity, has yet to be proven.Here we address these challenges using a multitude of short baseline experiments with four transponders and six corner reflectors deployed at test sites in the Netherlands and Slovakia. Combined together, we analyzed 980 transponder measurements in Sentinel-1 time series to a maximum extent of 21 months.We find an average Radar Cross Section (RCS) of over 42 dBm2 within a range of up to 15 degrees of elevation misalignment, which is comparable to a triangular trihedral corner reflector with a leg length of 2.0 m. Its RCS shows temporal variations of 0.3--0.7~dBm2 (standard deviation) which is partially correlated with surface temperature changes.The precision of the InSAR phase double-differences over short baselines between a transponder and a stable reference corner reflectors is found to be 0.5-1.2 mm (one sigma). We observe a correlation with surface temperature, leading to seasonal variations of up to +/-3 mm, which should be modeled and corrected for in high precision InSAR applications. For precise SAR positioning, we observe antenna-specific constant internal electronic delays of 1.2-2.1 m in slant-range, i.e., within the range resolution of the Sentinel-1 Interferometric Wide Swath (IW) product, with a temporal variability of less than 20~cm.Comparing similar transponders from the same series, we observe distinctdifferences in performance. Our main conclusion is that these characteristics are favorable for a wide range of geodetic applications. For particular demanding applications, individual calibration of single devices is strongly recommended.

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