Radar transceivers mounted on utility towers continuously measuring catenary wire sag and ice-induced wind galloping.
ISACGrid tower radar beams track high-voltage conductor spans up to 500 meters long. Phase-interferometric echo processing measures mid-span wire sag to within ±5 millimeters, providing immediate clearance verification above roadways.
Aerodynamic icing causes conductors to oscillate violently in high winds (galloping). Radar Doppler tracking detects resonance frequencies (0.2 to 1.0 Hz), alerting grid operators to de-energize circuits before mechanical tower collapse.