Chapter 2
History and Practice of RFID
2.1 It All Started with IFF
By the 1930’s, the primitive biplanes of fabric and wood that had populated the skies above the battlefields of World War I had become all-metal monoplanes capable of carrying thousands of kilograms of explosives and traveling at hundreds of km per hour: by the time observers could visually identify an incoming flight, it was too late to respond. Detection of airplanes beyond visual range was the task of microwave radar, also under rapid development in the 30’s, but mere detection of the presence of aircraft begged the key question: whose side were they on? It was exactly this inability to identify aircraft that enabled the mistaken assignment of incoming Japanese aircraft to an ...
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