| Author | Search for: Cusson, Daniel1; Search for: Gondi, Fernando Greene |
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| Affiliation | - National Research Council of Canada. Construction
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| Format | Text, Article |
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| Conference | 10th International Conference on Structural Health Monitoring of Intelligent Infrastructure, SHMII 2021, June 30 - 2 July 2021, Porto |
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| Subject | bridges; corner reflectors; displacement measurements; SAR satellites |
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| Abstract | A two-phase feasibility study has been conducted to investigate whether concrete bridges with poor natural radar reflectivity could be fitted with artificial corner reflectors at strategically selected locations to improve their monitoring suitability from radar satellites. The first phase consisted of identifying the optimal size and positioning of the corner reflectors on a case study bridge, being the Confederation Bridge linking the Canadian provinces of New-Brunswick and Prince-Edward Island. The optimization was based on several parameters including those related to the satellite viewing geometry and others depending on bridge construction details. Based on this theoretical study, the ideal size of the corner reflectors and the most suitable locations were identified to maximize the strength of the return radar signals and minimize the theoretical displacement error. The second phase of the study consisted of validating these preliminary theoretical specifications by installing a pair of corner reflectors on the bridge for field evaluation. These reflectors were installed by the bridge operator on the exterior side of the bridge barrier wall according to specifications determined in Phase 1. After the installation of the reflectors, satellite imagery was acquired over a period of six months to analyze and compare the backscatters coming from the artificial corner reflectors and the nearby elements of the bridge. The results from this feasibility study allowed to conclude that bridges with poor natural radar reflectivity like the Confederation Bridge would substantially benefit from having a dense array of corner reflectors for satellite-based monitoring which would enable accurate displacement measurements at precisely known locations for bridge performance assessment. |
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| Publication date | 2021-06-30 |
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| Publisher | The Conference |
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| In | |
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| Language | English |
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| Peer reviewed | Yes |
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| Export citation | Export as RIS |
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| Report a correction | Report a correction (opens in a new tab) |
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| Record identifier | 335c9272-d081-416c-ac6f-f785e4a20d02 |
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| Record created | 2023-06-16 |
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| Record modified | 2023-06-16 |
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