Design and Development of a Real-Time Displacement Monitoring System for Structures Using GNSS Technology

Khai Cong Pham

Abstract: This article presents the design and development of a real-time displacement monitoring system for structures using GNSS/CORS technology. The proposed system comprises three key components: a CORS station, a monitoring station, and a data transmission unit. The CORS station employs the Nets9 GNSS receiver, while the monitoring station integrates a receiver developed using the Trimble BD970 module. Real-time data are transmitted via the internet using the NTRIP protocol and processed in NMEA format. A sliding window algorithm is implemented to detect displacements, and the system's performance was validated through simulation experiments. Results demonstrated high accuracy, with maximum differences of 5 mm horizontally and 8 mm vertically when compared with laser distance meter readings.

Keywords: GNSS, CORS, RTK, displacement monitoring, sliding window algorithm