With the increasing demand for fine meteorological observation and severe weather forecast and early warning, weather radar is required more and more in meteorological operation. Today we will show you the black technology phased array technology of weather radar. < / P > < p > at present, the weather radar used in business uses the mechanical drive antenna to carry on the surface scanning mode. In other words, the radar antenna emits radio waves at a certain elevation angle, and the weather information of one surface can be obtained by rotating the antenna once. By changing the radar elevation angle, multiple cone scanning can be obtained, so as to complete a space volume scanning, and the body scanning cycle is about 6 minutes. < / P > < p > phased array weather radar is a kind of weather radar with electric scanning technology. The radar antenna emits multiple electromagnetic waves at the same time in the vertical direction, and the whole three-dimensional space scanning can be completed by rotating the antenna for one cycle without changing the elevation angle. Therefore, the completion time of one individual scanning can be shortened by multiple times, the minimum volume scanning time can be shortened to 12 seconds, and the detection resolution can reach 30 meters, which can monitor the change and development process of the weather system more quickly and completely. < / P > < p > in the world, phased array weather radar technology is also a new research hotspot. In recent years, the phased array weather radar technology has reached the international level through civil military integration and scientific and technological research. At present, phased array weather radar has been put into use in some areas with frequent disastrous weather, and plays an important role in national large-scale observation experiments. From the perspective of technology development, phased array is the main direction in the future. < / P > < p > the improvement of temporal and spatial resolution of single phased array weather radar can greatly improve the observation of medium and small-scale convective weather, but it is not enough to bring about subversive changes to the short-term and near-term weather warning and forecasting. Only by adding accurate information of flow field inside and outside the cloud, can the accuracy of short-term and imminent weather forecast be improved in essence. In order to obtain the flow field information accurately, the same target needs to be observed in different places at the same time, and the component composition of the target in three directions can be solved. Therefore, the phased array weather radar is arranged in different places to network to obtain multiple radial velocity (velocity component) of the target, hoping to obtain the moving velocity of the target. However, due to the different time of the radial velocity measured by multiple radars in the same space, for the weather with fast change of movement speed, such as tornado and hail, the difference in obtaining the radial velocity time will result in large or invalid synthetic velocity error. < / P > < p > phased array weather radar is a kind of distributed phased array weather radar. Its front-end is set up in different places respectively. Under the control of the radar back-end control center (equivalent to the human brain), the group synchronous detection can not only obtain multiple radial velocity, but also obtain the radial velocity with small time difference, so it can correctly synthesize the velocity and wind speed of the target. For the front-end of phased array weather radar, it only takes about 0.1 seconds to complete 0-90 ° elevation scanning in vertical direction. The time for the front end to complete a single scan (horizontal 0 ° and vertical 0-90 °) is between 12 and 30 seconds. The time mainly depends on the horizontal mechanical scanning, angular resolution and detection distance. Phased array weather radar can directly obtain the real three-dimensional flow field, and can obtain the minute or second level weather change. It can find downburst, thunderstorm, tornado and other small-scale weather systems earlier and faster. < / P > < p > phased array weather radar makes up for the lack of space-time accuracy of the existing weather radar for the detection of medium and small-scale severe convective weather, and provides more accurate detection information for the objectification and automation of short-term and imminent forecast and the establishment of modern short-term and imminent forecast based on the dynamic and thermodynamic detection of weather radar. < p > < p > on August 18, 2019, hail and thunderstorm gale appeared. From the radar detection information of phased array weather radar, we can clearly see the whole picture of the convective system such as hail and the details of its development and evolution, obtain enough accurate wind field inside the cloud, and reveal the dynamic characteristics of wind field when hail and thunderstorm wind (downburst) occur. In contrast, S-band radar can provide seamless scanning at the bottom of the storm, while phased array weather radar can provide seamless scanning of the whole storm. < p > < p > using the hail 3D model of 100 meter resolution 3D intensity and 3D velocity analysis provided by array weather radar, the coordination and evolution of the hail storm and its surrounding heat (intensity), dynamic (velocity) are clearly displayed. This is a three-dimensional thermal dynamic model of hail based on the detection results. < p > < p > Huanghua Airport phased array weather radar has repeatedly captured micro downburst weather, scattered convective echo, local weather process, thunderstorm, heavy rainfall and so on. Observation comparison of phased array weather radar (lower row) and C-band radar (upper row) at the same time. The phased array weather radar clearly observed the convective echo near the runway 22 minutes in advance, and observed every 12 seconds. The C-band radar can only detect when the strong echo is grounded. The weather radar system of phased array weather radar consists of four single polarization phased array receiving and transmitting subarrays and three dual polarization phased array receiving and transmitting subarrays, totally 7 subarrays. Foshan tornado detection center has carried out several severe convective analysis, and based on the unique three-dimensional flow field information of array phased array weather radar, the research of new short-term and imminent forecast is carried out. < / P > < p > the phased array weather radar system is composed of two single polarization and one dual polarization phased array receiving and transmitting subarrays. It will be deployed and tested in December 2020 and put into operation. The future is expected. The phased array weather radar, combined with the existing meteorological operational observation network, is expected to become a sharp weapon and heavy weapon in the aspects of high impact weather, medium and small scale severe convective weather, and urban waterlogging accurate monitoring and forecasting. Spontaneous combustion at a Guangzhou Motor vehicle intersection and other traffic lights in Shenzhen