Development course of Doppler radar

Pulse Doppler radar was successfully developed and put into use in 1960s. Since 1970s, with the development of large-scale integrated circuits and digital processing technology, pulse Doppler radar has been widely used in air early warning, navigation, missile guidance, satellite tracking, battlefield reconnaissance, shooting range measurement, weapon fire control and meteorological detection, and has become an important military equipment. The early warning aircraft equipped with pulse Doppler radar has become an effective military equipment against low-altitude bombers and cruise missiles. For example, the airborne fire control system mainly uses pulse Doppler radar. For example, the APG-68 radar equipped by American fighters represents the advanced level of airborne pulse Doppler fire control radar. With 18 working modes, it can track targets in air, ground and sea while searching, and has good anti-jamming performance. When the plane flies at low altitude, it can also guide the plane to track terrain fluctuations and avoid colliding with the ground. This kind of radar is small in size, light in weight and high in reliability.

In addition, this radar is also used for meteorological observation. The signal measurement of conventional weather radar is limited to the intensity of meteorological targets. In addition to all the functions of conventional weather radar, Doppler weather radar can also provide signals of atmospheric wind field at the same time. Through the Doppler velocity resolution of meteorological echo, the distribution of various turbulent movements in the atmosphere at different heights can be obtained. The development of Doppler weather radar technology in China started late, and the development of Doppler weather radar and its experimental application in meteorological services began in the late 1980s. In 1990s, 7 14CD and 7 14SD inter-pulse coherence have been produced. 1997 the first domestic imported WSR88D new generation Doppler weather radar settled in Shanghai. 1999, WSR-88D was modified, and the first advanced S-band full coherent pulse Doppler radar CINRAD/CC 3824 was produced. The main improvement of CINRAD/CC is to measure the radial velocity of precipitation particles by using Doppler effect in physics, and infer the wind speed distribution, wind field structure characteristics and vertical airflow velocity of precipitation clouds from the velocity information. At present, it is the leading ground-based meteorological detection equipment in developed countries such as the United States and Western Europe. Doppler radar is the most advanced radar system in the world, known as "super clairvoyance", with a maximum detection range of 460km. Compared with traditional weather radar, Doppler radar can monitor the formation and change of convective clouds at an altitude of 8- 12km perpendicular to the ground and judge the moving speed of clouds. There are as many as 72 kinds of product information, and the accuracy of weather forecast will be greatly improved. A new generation of weather radar network is being built to improve the timeliness and accuracy of severe weather forecasts such as sudden rainstorm, coastal typhoon and early warning of heavy precipitation in large rivers. By the end of 20 10, China has built 126 new generation weather radar stations, accounting for 73% of the 58 stations planned by the whole country. Divided into s-band and c-band. There are three different types of radars in S-band, (CINRAD/SA, CINRAD/SB, CINRAD/SC) mainly distributed along the Yangtze River. C-band radars (CINRAD/CC, CINRAD/CB, CINRAD/CD, CINRAD/CCJ) are mainly distributed inland.