To address the challenges of complex on-site management and low supervision efficiency in power grid construction projects

this paper proposes an intelligent positioning system based on the fusion of ultra-wide band(UWB) and millimeter-wave radar.By combining high-precision 3D positioning from UWB with label-free 2D detection capabilities of millimeter-wave radar

a heterogeneous cooperative localization architecture is established.The upper-level system fuses dual-mode data and integrates an environmental perception module to enable centimeter-level accurate positioning for tagged personnel and vehicles

as well as up to 50-meter-range tagless detection of unregistered targets.This solution overcomes the coverage limitations of traditional single-mode technologies.Experimental results demonstrate that the system can track personnel and vehicle movements in real time

issue alerts within one second for intrusions into hazardous areas and improve positioning stability by more than 40% over existing methods.This provides a new paradigm for accurate and robust management in complex construction environments and is adaptable to other high-risk settings such as mining and petrochemical industries.