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→History of Radar
*1904 : Christian Hülsmeyer, patent "Process for reporting distant metallic objects to an observer by means of electric waves"
*1940s: Würzburg giant from Telefunken f = 560 MHz, B = 500 kHz, m = 11 t, range: 60-80 km Search and track aircraft
*1942 : Frequency hopping method �Hedy , Hedy Lamarr + George Antheil: using Piano rolls to rapidly change RF frequencies to remotely control torpedoes. Problem: Synchronizing transmitter and receiver. �SolutionSolution: synchronously running piano rolls (punch tape).
Although no known working device was ever produced, the technology today is the basis for RF standards like Bluetooth and 3G as well as military Radars and communication Radars.
*1951: Synthetic Aperture Radar: Enlarging antenna aperture using controlled motion of the system. The method yields high resolution images of objects and landscapes
