Each Global Hawk has infra-red and radar sensors, and a surveillance range of 100 miles.
ECONOMIST: Unmanned aircraft
The aircraft uses video images, infra-red and radar sensors to locate targets at day and night.
BBC: News | In Depth | Military Fact Files
The Predator comes equipped with radar, seven video cameras, an infra-red sensor and a powerful zoom.
BBC: US-Mexico border: Efforts to build a virtual wall
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