Radar, short for Radio Detection and Ranging, is an electronic device that uses electromagnetic waves to detect targets.
Its development history can be summarized as the following key stages:

1、 Early Exploration and Theoretical Basis

In 1842, Austrian physicist Christian Andreas Doppler first proposed the idea of using the Doppler effect for Doppler radar, laying the theoretical foundation for the development of radar technology.
In 1864, British physicist James Clerk Maxwell derived a formula for calculating the characteristics of electromagnetic waves, providing a scientific basis for the application of electromagnetic waves.
In 1886, German physicist Heinrich Hertz conducted a series of experiments to study radio waves, laying the experimental foundation for the birth of radar technology.
In 1888, Hertz successfully used instruments to generate radio waves, further advancing the study of electromagnetic waves.

2、 The Sprout of Radar Technology

In 1904, Christian H ü lsmeyer of Germany invented the telemobiloscope, a device that uses radio wave echo detection to prevent collisions between ships at sea. It is considered the prototype of radar technology.
In 1906, De Forest Lee invented the vacuum transistor, which was the world's first active electronic component capable of amplifying signals, providing technical support for the amplification and processing of radar signals.

3、 The birth and development of radar technology

In the 1920s, Marconi and Franklin began studying shortwave signal reflection, accumulating experience for the development of radar technology.
In 1922, Marconi delivered a speech at the American Institute of Electrical and Radio Engineers (AIEE) introducing the concept of a planar angle radar that could prevent ship collisions.
In 1935, British physicist Robert Watson Watt successfully developed the world's first practical radar, marking the official birth of radar technology. In the same year, Guton, France also developed a radar that used a magnetron to generate signals, which could detect other ships in foggy or dark weather.

4、 The widespread application of radar technology

During World War II, radar technology was widely used in the military field and became an important tool for air defense operations. Britain, the United States and other countries have extensively developed and deployed radar systems, which have played an important role in combating fascist aggression.
Post war development: With the end of the war, radar technology gradually shifted towards civilian use. In 1949, the Civil Aviation Administration of the United States began using radar as the primary navigation device for civilian aircraft, solving the navigation problem of aircraft in airport airspace under adverse weather conditions.
Modern radar technology: Since entering the 21st century, radar technology has continuously developed and innovated, resulting in various new radar systems and technologies such as phased array radar, synthetic aperture radar, dual/multi base radar, etc. These new technologies have improved the performance and reliability of radar, making it more widely used in fields such as meteorological observation, resource exploration, and environmental monitoring.

The development process of radar technology is a continuous expansion and deepening from theoretical exploration to practical application, from military to civilian fields. With the continuous advancement and innovation of technology, radar technology will continue to play an important role in various fields.