If you've ever worried about the threat from supersonic tennis balls, then BAE Systems? Artisan medium-range Type 997 3D surveillance radar should put you at ease ? it can detect one traveling at Mach 3 (1,980 mph, 3,186 km/h) at a distance of 25 kilometers (15.5 mi). The new radar, developed for the Royal Navy?s Type 23 Duke-class frigates, is designed to simultaneously detect 900 targets smaller than a bird, against background noise equivalent to 10,000 mobile phone signals at ranges from 200 meters (656 ft) to 200 kilometers (124 mi). (continued)
That's some sensitive radar.