Abstract:Abstract: Aiming at the problems of short service life, low monitoring accuracy and slow transmission speed in the long-term monitoring of ice thickness of high-voltage transmission lines, the traditional tension tilt sensor and camera monitoring system are easy to appear. This paper designs a real-time monitoring system for ice coating on transmission lines based on Beidou navigation and communication technology. The system USES the Beidou carrier differential positioning principle to accurately obtain the high-precision three-dimensional spatial coordinates of transmission lines, then, the position coordinate information is unified into the Cartesian coordinate system to correct the positioning error, Building ice thickness calculation model based on multiple variables including change of transmission line position, transmission line length and instrument installation position in time domain, And embed the model in the intelligent wire positioning terminal to construct a transmission line monitoring network, it realize full-time, full-location monitoring of transmission line ice thickness. Multiple indoor and outdoor experimental tests have proved that the system can effectively realize real-time monitoring and feedback of transmission line ice coating conditions with millimeter-level accuracy and millisecond-level speed.