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The Doppler Effect was proposed by Christian Doppler in Prague , It is used to measure the velocity of detected objects , The effect was used in many radars and is still used .
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During the 19th century , German physicist Heinrich Hertz conducted experiments that proved the existence of electromagnetic waves . he found that these waves would transmit through different types of materials and also would reflect off metal surfaces in his lab
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In 1904, Christian Hülsmeyer gave public demonstrations in Germany and the Netherlands of the use of radio echoes to detect ships so that collisions could be avoided. His device consisted of a simple spark gap used to generate a signal. He is credited with the actual discovery of the radar .
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Robert Watson-Watt's work resulted in the design and installation of aircraft detection and tracking stations on the east and south coasts of England in 1939 , Since WWII was approaching . His system aided significantly in winning the Battle of Britain
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Arnold Wilkins was a pioneer in Radar development , He suggested that reflected radio waves might be used to detect aircraft , Along with Robert Watson-Watt and his suggestions led to the first ground to air radar detection
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John Randall created a device that generates microwaves using electrons in a magnetic field
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During World War II, military radar operators noticed disturbances in echoes that were returning due to weather effects . David Atlas studied these waves and his results would help create the first weather radar .
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Today , Radars are used to detect speed (Radar Guns) , Record weather , and are used in combat situations .
