Validation of the phase difference method for atmospheric correction in GB-SAR

Liu, Jie; Yang, Honglei; Cai, Jianwei; Zhao, Binbin; Peng, Junhuan; Гао, Зонгшенг; Yang, Wu

doi:10.1080/14498596.2020.1843557

Cited by 2 publications

(1 citation statement)

References 21 publications

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“…Nevertheless, the GB-radar system also has limitations. Bridges are commonly constructed over a river or a valley where the atmospheric is unsettled, however, the GB-radar system is easily affected by the changes of atmospheric properties [59,60]. Additionally, in long-term monitoring, the accumulation of phase noise contribution [10] would make the GB-radar displacement result increasingly unreliable, and thus periodic corrections are needed.…”

Section: Potentials and Limitations In Gb-radar Shmmentioning

confidence: 99%

A Comprehensive Analysis of Static and Dynamic Load Tests of a Long-Span Cable-Stayed Bridge with a Ground-Based Radar Interferometer

Chen¹,

Huang²,

Zhang³

et al. 2023

Preprint

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Bridge load testing is crucial in evaluating bridge load-carrying capacity and construction quality. However, conventional techniques have many limitations such as the need for direct contact and low acquisition frequency. This study provides a comprehensive examination of the static and dynamic load tests of a multi-span cable-stayed bridge utilizing a ground-based radar inter-ferometer (GB-radar). The case study was conducted at the Fifth Nanjing Yangtze River Bridge (FNYRB), which is recognized as the world's first lightweight steel-concrete composite cable-stayed bridge, with two spans measuring 600 m. To enhance measurement accuracy, a method was proposed to detect and recover radar phase jumps caused by vehicle motion. Furthermore, precise geometry projection was employed to acquire vertical displacements from GB-radar which were taken along the line-of-sight (LOS) direction. Moreover, during the static load test, a continuous deformation was observed with a maximum pace of 0.31 mm/min, indicating a post-construction settlement caused by soft soil consolidation. This case study highlights the high sampling frequency, high measurement accuracy, and exceptional weatherproof ability of GB-radar, thereby demonstrating its potential to be an alternative to the structural health monitoring (SHM) system.

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Section: Potentials and Limitations In Gb-radar Shmmentioning

confidence: 99%

A Comprehensive Analysis of Static and Dynamic Load Tests of a Long-Span Cable-Stayed Bridge with a Ground-Based Radar Interferometer

Chen¹,

Huang²,

Zhang³

et al. 2023

Preprint

View full text Add to dashboard Cite

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Novel Model-Based Approaches for Non-Homogenous Atmospheric Compensation of GB-InSAR in the Azimuth and Horizontal Directions

Liu

Yang

et al. 2021

Remote Sensing

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Atmospheric disturbance is a main interference for deformation monitoring by GB-InSAR. Most approaches for atmospheric correction are based on the homogenous atmospheric medium assumption that usually does not hold due to complex topography and various environmental factors, leading to low atmospheric correction accuracy. This study proposes two novel model-based approaches for non-homogenous atmospheric compensation in the azimuth and horizontal directions. The conception of a coordinate system is introduced to design the model for the first time. The 2D atmospheric compensation method designed based on the polar coordinate system can address the non-homogenous atmospheric phase screen (APS) correction in the azimuth direction. The 3D atmospheric compensation method based on the rectangular coordinate system deals with the non-homogenous APS in all three directions, and can better address the non-homogenous APS in the elevation direction than the 2D method. Compared with conventional models, the 2D and 3D models consider the other non-homogenous APS conditions in their respective coordinate systems, which helps to broaden the application of model-based approaches. Experiments using different equipment over two study areas are conducted to test the efficiency of the proposed models. The results demonstrate that the proposed approaches can eliminate non-homogenous atmospheric disturbance and enhance the accuracy of GB-InSAR atmospheric compensation, leading to great improvements in slope deformation estimation.

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Validation of the phase difference method for atmospheric correction in GB-SAR

Cited by 2 publications

References 21 publications

A Comprehensive Analysis of Static and Dynamic Load Tests of a Long-Span Cable-Stayed Bridge with a Ground-Based Radar Interferometer

A Comprehensive Analysis of Static and Dynamic Load Tests of a Long-Span Cable-Stayed Bridge with a Ground-Based Radar Interferometer

Novel Model-Based Approaches for Non-Homogenous Atmospheric Compensation of GB-InSAR in the Azimuth and Horizontal Directions

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