Radar (properly R.A.D.A.R. or RADAR, for Radio Detection and Ranging) is a detection system that uses radio waves to determine the distance (range), angle, or velocity of objects. It can be used to detect aircraft, ships, spacecraft, guided missiles, motor vehicles, weather formations, and terrain. A radar system consists of a transmitter producing electromagnetic waves in the radio or microwaves domain, a transmitting antenna, a receiving antenna (often the same antenna is used for transmitting and receiving) and a receiver and processor to determine properties of the object(s). Radio waves (pulsed or continuous) from the transmitter reflect off the object and return to the receiver, giving information about the object's location and speed.
Radar was developed secretly for military use by several nations in the period before and during World War II. A key development was the cavity magnetron in the United Kingdom, which allowed the creation of relatively small systems with sub-meter resolution. The term RADAR was coined in 1940 by the United States Navy as an acronym for "radio detection and ranging". The term radar has since entered English and other languages as a common noun, losing all capitalization. During RAF RADAR courses in 1954/5 at Yatesbury Training Camp "radio azimuth direction and ranging" was suggested. The modern uses of radar are highly diverse, including air and terrestrial traffic control, radar astronomy, air-defense systems, antimissile systems, marine radars to locate landmarks and other ships, aircraft anticollision systems, ocean surveillance systems, outer space surveillance and rendezvous systems, meteorological precipitation monitoring, altimetry and flight control systems, guided missile target locating systems, self-driving cars, and ground-penetrating radar for geological observations. High tech radar systems are associated with digital signal processing, machine learning and are capable of extracting useful information from very high noise levels.
Other systems similar to radar make use of other parts of the electromagnetic spectrum. One example is LIDAR, which uses predominantly infrared light from lasers rather than radio waves. With the emergence of driverless vehicles, radar is expected to assist the automated platform to monitor its environment, thus preventing unwanted incidents.
There's an interesting development in radar. Seems an Isralie company, Camero, should have (in a year) an ultra wideband radar, that generates an image, similar to the sonar images, seen in the maternity wards. Supposedly the machine would be sold to police departments to see through (bad...
I want to know the basic concept of Passive Radar System that can detect Stealth Aircraft? Which country invented this technology ? Is there any website that has information of this technology?
Jim Bohannon was a radio guy who took over the airwaves when Larry King left for television stardom-the guy actually read headlines from WWN and 'scouffed' at the 'ignorance and gullibity of people who believe this nonsense'! Every week! (of course, the Washington Times would be the latest...
I am trying to gain an understanding of how Stealth technology defeats conventional radar, and wondering about strategies to get around it. In addition to explaining the basics of the Stealth technology, can someone explain why the planes are not simply detected by infrared sensitive devices...