What Is a Weather Doppler?

Doppler weather radar is an active remote sensing detection tool. It has important applications in measuring the intrinsic factors of the occurrence and development of clouds, rainfall and various strong convective weather. Its working principle is based on the Doppler effect, which can The speed of the scatterer relative to the radar reflects the atmospheric wind field, the distribution of the vertical velocity of the airflow, and the turbulence under certain conditions. This is of great significance for alerting against strong convective weather. ^[1]

Doppler radar is currently the most advanced weather monitoring equipment in the world and has been in-depth applied in many countries. Therefore, we will conduct in-depth analysis and research on the working principle of Doppler radar in order to enable people to work on it Have a clearer understanding. ^[2]

The products of the new generation Doppler weather radar include basic products and derived products. There are three basic products: reflectivity factor, average radial velocity, and spectral width. The reflectivity factor depicts a complete 360 & ordm; azimuth scan of the echo intensity data, the data grade is expressed in dBZ. Radar operators can rely on reflectance factor products to determine the strength of

Doppler radar is currently the world's most advanced radar system, known as "Super Clairvoyance." Compared with traditional weather radar, Doppler radar can detect the generation and change of convective clouds in the high altitude of 8-12 kilometers, and determine the speed of cloud movement. Its product information reaches 72 kinds, and the accuracy of weather forecast It will be greatly improved than before. From 1991 to 1997, 165 NEXRDA screened by the United States nationwide and overseas were called models of weather radar systems, and they are currently the most advanced and accurate weather radar systems in the world. It uses unmatched Doppler signal processing technology and the ability to automatically generate severe weather alerts. NEXRAD can automatically form and display a variety of weather products, greatly improving the effects of supercells, lake effect snow, layered snow, thunderstorms, precipitation, wind shear, downburst, tornado, front, turbulence, hail Ability to monitor and forecast severe and severe weather. The reconnaissance rate for strong thunderstorms is 96%, the discovery rate for tornadoes is 83%, and the average warning time for tornado warnings is 18 minutes. Before the NEXRDA network was established, the average value of the above parameters in the United States was 60. %, 40% and 2 minutes. It can be expected that CINRDA will fundamentally enhance the ability to detect strong thunderstorms, can detect atmospheric turbulence that threatens navigation under clear skies, and the possibility of catastrophic floods, and will provide extremely valuable information for water resources management decisions. The construction of a new generation of weather radar system is a meteorological modernization project in China from the end of the 20th century to the beginning of the 21st century. It is planned to build 156 S-band and C-band radars across the country. After the system is completed, China's meteorological modernization level will reach a new level. ^[4]