Dynamic structural health monitoring with high-accuracy GNSS
RTK positioning ensuring public safety in Korea
In Seoul city, the national capital of Korea, the government is using the latest technological advances to ensure public safety. Automotive as well as pedestrian bridges are being monitored by high accuracy GPS/GNSS receivers which detect the slightest shifts in positioning and provide engineers with data to better understand the displacement of large structures over time, especially during powerful storms or heavy loads. This national project is organized by MOLIT the Korean Ministry of Land, Infrastructure and Transport, who employed Jipyong Space to install the positioning sensers best suited for the job. Jipyong Space chose the AsteRx SB ProConnect GNSS receiver to be installed on several bridges around Seoul to record real-time displacement with RTK centimeter-level accuracy. For example, when two 40-ton trucks drove across the bridge simultaneously, 7 to 9 cm displacement was confirmed in vertical direction. With these highly reliable GNSS sensors in place, Jipyong Space sets thresholds for a warning and alarm systems to make sure the structures get the needed attention before it is too late.
All the places where Septentrio receivers were installed have excellent operational results including high data quality and easy set-up and management with the web GUI and software tools.
AsteRx SB ProConnect multi-frequency GNSS receiver makes it possible to record even the slightest structural shifts.
- GNSS receivers were installed in the middle of the bridge where maximum displacement was expected.
- Data is output at the frequency of 20 Hz.
- AIM+ anti-jamming, anti-spoofing technology on the AsteRx receiver makes it resilient to jammers, which may be found on cars or trucks that try to avoid road tolling.
- PolaNt MF Antenna was used for rover receivers and Choke-Ring Antenna for the base station.
MOLIT the Korean Ministry of Land, Infrastructure and Transport, is the governmental entity responsible for the country’s safe and convenient transport services, efficient logistics systems, balanced territorial development and environment-friendly territorial management.