Research on the medium technology of bridge deflection rapid detection based on integrated navigation technology

The Inertial Navigation System (INS) features a high data acquisition frequency and can autonomously calculate attitude, velocity, and position without relying on external auxiliary information, demonstrating strong stability and reliability. However, inertial navigation errors accumulate over time, only maintaining high-precision stability for a short period. Satellite signals are extremely weak and vulnerable to interference, but the position errors provided by satellite navigation do not accumulate over time. There is excellent complementarity between the satellite navigation system and the inertial navigation system. Through GNSS/INS integration, the advantages of both systems can be fully leveraged. This study focuses on bridge transient deflection detection technology based on Beidou + inertial navigation technology, constructing a lightweight, miniaturized, cost-effective, and universal integrated dynamic bridge deflection rapid detection and hardware integration detection platform for bridge structures. Aimed at significantly reducing costs, it fills the gap of tedious preparatory work for deploying a large number of sensors at monitoring points of long-span bridges; it can timely capture the dynamic response of bridges under various loads, effectively assess the health status and safety performance of bridge structures, provide a scientific basis for preventive maintenance, emergency response decision-making, and longterm performance monitoring of bridges, significantly enhance the intelligent level and efficiency of bridge operation and maintenance management, and ensure the safety and smoothness of transportation infrastructure.