Abstract: Aiming at the issue of external damage to transmission lines caused by the construction of cranes and other machinery, a transmission line early warning and interlocking control system based on radio frequency radar is proposed to construct a three-dimensional multi-level warning zone under the transmission lines. Through calculations of target RCS value, distance, speed,longitude and latitude, spatial segmentation, clustering, dynamic and static separation, tracking and other filtering and recognition processing are carried out, which realizes the state monitoring,tracking and early warning of ultra-high machinery under transmission lines. The developed crane is equipped with autonomous linkage, monitoring and locking devices and has laser light curtain directional warning and voice prompt functions. On-site testing results show, the system can effectively prevent external damage to transmission lines and can provide early warning and active intervention for the intrusion hazards of ultra-high machinery such as cranes.

Key words: transmission line, radio frequency radar, three dimensional multi-level alert zone, laser light curtain, early warning, interlocking control