Surveillance Equipment > Radar Surveillance Tower
A radar tower with surveillance equipment is photographed against a bright blue sky. The combination of cameras and radar ensures that trespassers are both deterred and caught. The radar will pick up movement, and security personnel will be notified if something is amiss.
Radar is a system that allows one to use radio waves to detect the presence of objects. The word radar stands for radar detection and ranging.
Radar was invented during World War II, in order to detect marine vessels. Lee DuBridge, an American physicist who played a prominent role in developing radar, said, "The bomb may have ended the war, but radar won the war."
Though radar was perfected during World War II, many other nations, including Germany, America, England, France, Switzerland, Russia, Japan, and Italy experimented with radar as early as the 1930s.
In 1935, German Hans Eric Hollman used radio communications and microwave radar work to locate a ship eight kilometers away with an accuracy of 50 meters, while aircraft at an altitude of 500 meters were detected at a 28-kilometer range. The same year, Englishman Henry Tizard established the Aeronautical Research Committee, which went on to oversee British radar development through 1940. Tizard asked Scotsman Robert Watson-Watt to develop an electromagnetic "death ray," at which point Watson-Watt suggested that radar might be better used for detection instead of for destruction. Watson- Wyatt then conducted the "Daventry experiment," during which he was able to use wave interference to detect an aircraft eight miles away. In 1935 the English developed a radar early warning system for the coast, while in France a ship collision avoidance radar was put into action.
Robert M. Page was the first American to successfully demonstrate pulsed radar, in 1936, when he detected an aircraft 2.5 miles away. In 1937 R.C. Newhouse of Bell Labs advanced the understanding of the radio altimeter, while the same year, in Germany, the Freya and Seetakt radar systems were born. The British built the first of their seven Chain Home radars in 1937, while in 1938 the U.S. Army operated its first fire-controlled radar. By 1939, during the height of World War II, the U.S. sent six early warning radar sets to Pearl Harbor, while England placed 19 radar systems along its east and south coasts.
While radar has roots in war and may initially have been used to detect ships, it has many other practical applications today. Today, radar is used by scientists to map the Earth and other planets, by air traffic controllers to safely guide planes to a landing, and by meteorologists to track storms. There are even everyday applications for radar, including signaling automatic doors to open.
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Radar Tower - Radar Surveillance Technology