Abstract:This paper studies the application of high-precision positioning technology of BeiDou-3 in the safety monitoring of transmission line towers. BeiDou-3 is equipped with centimeter-level positioning accuracy and short message communication capabilities. By integrating multi-frequency signals and network real-time kinematic (RTK) technology, it can monitor key parameters such as settlement, tilt, and vibration of the towers in real-time. The paper provides a detailed explanation of the composition and technical principles of the BeiDou-3 system, and designs a tower monitoring system based on square slices. The system uses multiple layers of monitoring units distributed at key nodes to collect and transmit data in real-time. To address the interference issues that exist in the monitoring process, the paper proposes data cleaning and processing methods, and combines trend prediction and early warning mechanisms to enhance the accuracy and real-time performance of the monitoring system. Through practical application verification, this innovative monitoring method has shown good adaptability in complex terrains, providing scientific support and reliable assurance for the safety monitoring of transmission line towers.