1In June, 930, Taylor and Yang's colleague Highland discovered again that if a plane flew overhead, his radio signal would be seriously disturbed. Therefore, he suggested that the navy adopt the method of transmitting directional radio beams to search for enemy planes in the distance.
In 1930s, the United States, Britain, France, the Netherlands and Germany studied the radar for detecting aircraft. It's hard to say who started it, so some people call it "simultaneous invention".
1934, British physicist Watson Watt led a group of scientists to make a scientific investigation of the atmosphere by using radio technology. The instruments they use are radio transmitters, receivers and cathode ray tubes. One day, when they were looking at the screen of the cathode ray tube, Watson Watt noticed a series of small bright spots, which caught his attention. After many experiments, it is found that these bright spots are electromagnetic wave signals reflected by a nearby building. Watson watt immediately thought: since buildings can reflect radio waves and display them on the screen, can't planes flying in the distant air also reflect radio waves and display them on the screen?
From 1935 to 65438+ 10, Watson watt and others began the experiment and development of radar. They first made the transmitter and receiver of radio waves, and then put all the equipment on the truck. When the test plane takes off from 15km and flies to the truck, the transmitter on the car emits electric waves. When it hits the plane, the electric waves quickly reflect back and are received by the receiver on the car. During the test, they can find the plane 0/2 km away from the car/kloc-.
From 65438 to 0935, Watson Watt submitted an article entitled "Detecting Aircraft with Radar" to the British Air Force, which aroused the government's attention to military radar. At that time, the radio laboratory of the British Institute of Physics developed an aircraft detection radar device-CH system, which used electromagnetic waves with the wavelength of 1.5 cm and the detection distance was 90 kilometers. In the same year, the French Institute of Radio Electronics installed the decimeter band "Target radar detectors" on the ship Normandy, which was the earliest civil radar.
In order to detect enemy ships and enemy planes, in 1935, the US Naval Research Laboratory planned to design a "radio detection and ranging" device, referred to as radar. After a year of hard work, we have designed a radar that can detect aircraft within 60 kilometers.
As early as April 1934, the United States naval research laboratory began to research and design the pulse radar, and it was successfully trial-produced in 1936. They also designed a transmitter and receiver antenna switch for this kind of radar, which can automatically switch the antenna to the receiver between two pulses, so that both the receiver and the transmitter can use the antenna, which reduces the size of the radar and makes it possible to install the radar on warships. 1in April, 937, the United States first equipped warships with radar. At 1938, radar was used to prevent air strikes.
1938 In September, the CH radar system developed by Britain was put into use. It is deployed near the mouth of the Thames River in Britain and can detect aircraft 250 kilometers away. 194 1 year, Britain formed a complete air defense radar early warning network along the coastline. Radar is playing an increasingly important role in the war.