Starting in 1931, he observed that plane triggered interference to the alerts. The LNR then initiated research on a detection method known as barrage électromagnétique .
The history of radar started with experiments by Heinrich Hertz within the late nineteenth century that showed that radio waves were reflected by metallic objects. This risk was advised in James Clerk Maxwell’s seminal work on electromagnetism.
In 1915, Robert Watson-Watt used radio technology to supply advance warning to airmen and through the Twenties went on to steer the U.K. research institution to make many advances using radio techniques, including the probing of the ionosphere and the detection of lightning at lengthy distances...Read More