History of Radar in Timeline

By Popular Timelines Editorial Team · Updated: July 19, 2026

Radar (Radio Detection and Ranging) is a detection system that utilizes radio waves to determine the range, angle, or velocity of objects. By transmitting electromagnetic pulses and analyzing the reflected echoes, it can pinpoint the location and movement of stationary or moving targets, such as aircraft, ships, spacecraft, and weather formations. The technology relies on the Doppler effect for speed measurement and antenna orientation for spatial positioning. Developed significantly during the 20th century, particularly for military defense during World War II, radar has since become indispensable in modern civilian life. Key applications include air traffic control, maritime navigation, meteorological forecasting, and automotive driver-assistance systems. Its ability to operate effectively in darkness, fog, rain, and snow makes it a critical tool for safety, surveillance, and navigation across diverse global environments.

April 1904: Patent for Detection Device

In April 1904, Christian Hülsmeyer secured a patent for his innovative device capable of detecting distant metallic objects using radio waves.

September 1904: British Patent for Telemobiloscope

On 23 September 1904, Christian Hülsmeyer was granted a British patent for his full radar system, known as the telemobiloscope, which utilized a spark-gap pulsed signal and parabolic horn antenna.

1915: Early application of radio technology for weather warning

In 1915, Robert Watson-Watt utilized radio technology to provide advance warnings of thunderstorms to airmen, marking a significant early practical application of radio waves for aviation safety.

1922: Discovery of Signal Interference by Ships

In 1922, U.S. Navy researchers A. Hoyt Taylor and Leo C. Young conducted experiments on the Potomac River demonstrating that ships passing between a transmitter and receiver caused radio signal fading, laying the conceptual groundwork for ship detection.

1928: L. S. Alder Files Provisional Patent

In 1928, L. S. Alder successfully filed a secret provisional patent in the United Kingdom regarding the development of naval radar technology.

January 1931: Royal Engineers Record Radar Invention

In January 1931, the Royal Engineers formally recorded the radar apparatus developed by W.A.S. Butement and P. E. Pollard in their Inventions Book, marking the first official British documentation of technology that would later power the Chain Home (low) coastal defense system.

December 1934: First pulsed radar apparatus demonstration

In December 1934, American researcher Robert M. Page, while stationed at the Naval Research Laboratory, successfully demonstrated the first elementary pulsed radar system, marking a foundational moment in the evolution of radar technology.

1934: Development of Obstacle-Locating Radio Apparatus

In 1934, the research department of the Compagnie générale de la télégraphie sans fil (CSF), led by Maurice Ponte alongside Henri Gutton, Sylvain Berline, and M. Hugon, initiated the creation of an obstacle-detecting radio device based on prior research into the split-anode magnetron.

February 1935: The Daventry Experiment

On 26 February 1935, Robert Watson-Watt and his team conducted the Daventry Experiment to test radio detection of aircraft. By utilizing a BBC shortwave transmitter and a GPO receiver, they successfully detected a bomber aircraft in flight, proving the viability of radar technology and securing immediate funding for further development.

May 1935: GEMA pulsed radar demonstration

In May 1935, German researcher Rudolf Kühnhold and the firm GEMA demonstrated a new pulsed radar system, advancing the global development of radar technology during this period.

June 1935: British Air Ministry radar demonstration

In June 1935, an Air Ministry team led by Robert Watson-Watt in Great Britain demonstrated a pulsed radar system, contributing significantly to the international progress of early detection technology.

1935: Installation of Radar Prototype on the Normandie

During 1935, specific components of the obstacle-locating radio apparatus developed by the CSF team were successfully installed and tested on the ocean liner Normandie.

1935: Development of Initial Radar Systems

In 1935, following the acquisition of necessary funding and development support, the project team successfully produced the first working radar systems.

1936: Operational Deployment of Chain Home

By 1936, the first five Chain Home (CH) radar systems were officially completed and brought into operation to monitor airspace.

1936: Establishment of Bawdsey Research Station

In 1936, Watson-Watt was appointed superintendent of the Bawdsey Research Station, a new facility established under the British Air Ministry to accelerate radar development.

1938: First commercial radar installation on aircraft

In 1938, United Air Lines became the first to utilize radar technology on its commercial aircraft, deploying a device developed by Bell Labs to improve safety and navigation.

1939: Completion of Chain Home Radar Network

By the outbreak of World War II in 1939, the Chain Home radar system was installed along the coasts of England to detect and track enemy aircraft.

1939: Production of RUS-1 and RUS-2 Redut

In 1939, the Soviet Union initiated the mass production of its first radar systems, the RUS-1 and RUS-2 Redut, though progress was later hindered by the arrest of P.K. Oshchepkov.

April 1940: Popular Science Radar Feature

In April 1940, Popular Science magazine published an article discussing air defense that featured a radar unit utilizing the Watson-Watt patent.

1940: Expansion of the Chain Home Network

By 1940, the Chain Home radar network had been expanded significantly, covering the entire United Kingdom, including Northern Ireland.

1940: The Tizard Mission and the Sharing of Cavity Magnetron Technology

In 1940, during the Tizard Mission, Great Britain shared its breakthrough cavity magnetron technology with the United States, a critical development that enabled the production of compact radar systems with high-resolution, sub-meter capabilities.

1940: Coining of the Term Radar

In 1940, the United States Navy officially coined the term RADAR as an acronym for "radio detection and ranging," establishing the name that would eventually become a common noun in the English language.

1941: Watson-Watt U.S. Deployment and Lab Establishment

During 1941, Robert Watson-Watt was deployed to the United States to provide air defense guidance following the attack on Pearl Harbor, while Alfred Lee Loomis established the MIT Radiation Laboratory to pioneer microwave radar technology.

June 1943: Deployment of Gneiss-2 Airborne Radar

In June 1943, the Gneiss-2, which was the first Russian airborne radar system, officially entered military service, being mounted on Pe-2 dive bombers.

1943: Development of Monopulse Radar

In 1943, Page significantly advanced radar capabilities by developing the monopulse technique, which became a foundational element in most future radar applications.

1944: Production Milestone for Gneiss-2

By the end of 1944, the production of the Gneiss-2 radar system reached a total of more than 230 operational stations.

1978: Loss of U.S. Navy aircraft due to Coolanol fire

In 1978, a U.S. Navy aircraft was lost in an incident attributed to a fire caused by Coolanol, a silicate ester coolant used in military radar systems which is known to be hygroscopic and flammable.

2017: NOAA National Phased Array Radar Initiative

In 2017, NOAA announced a strategic plan to deploy a comprehensive national network of multi-function phased array radars across the United States over the subsequent decade. This initiative aims to significantly improve both meteorological research and flight monitoring capabilities.