Schematic diagram of Fengyun III G star in orbit. Image source: Yang Runfeng, who is testing data from the factory building, has mixed feelings when the 704 Institute of China Aerospace Science and Technology Group heard the roar of rocket ignition and launch. Just like a child who has been raising for many years, suddenly really left you, "he recalled in an interview with a reporter from Science and Technology Daily. On April 16th of this year, China's first dedicated precipitation measurement satellite, Fengyun-3 G-satellite, was launched. Its main payload was China's first spaceborne Ku and Ka dual frequency precipitation measurement radar developed by the 704 Institute of the Ninth Academy of China Aerospace Science and Technology Group. As of the reporter's press release, the radar, with its sharp "double eyes", has successfully detected the three-dimensional fine structure of precipitation in mid to low latitude regions around the world, capturing the three-dimensional structure of typhoon rainfall systems such as "Marva" and "Taili". During the rainstorm in North China in August, the radar accurately detected the three-dimensional fine structure information of precipitation, providing valuable observation data for disaster prevention and mitigation. As the chief designer of the 704 Fengyun III G satellite precipitation measurement radar, Yang Runfeng and colleagues have been working hard for this product for 17 years. The young people who were once spirited have now given birth to Huafa. China is located in the western North Pacific typhoon activity zone, and typhoon rainstorm waterlogging has always been the main natural disaster faced by some regions. Obtaining precipitation data mainly relied on methods such as rain gauges and ground-based radars in the past, but due to limitations in the number and distribution of equipment, it is difficult to obtain large-scale and high-resolution ground precipitation information. In 1997, the United States and Japan jointly launched the TRMM (Tropical Rainfall Measurement Mission) satellite carrying precipitation radar, which pioneered the use of spaceborne radar to detect precipitation and provided reference ideas for the development of China's new generation of low orbit wind and cloud meteorological satellites. At the beginning of the 21st century, researchers from 704 institutes began collecting materials and conducting preliminary research on spaceborne precipitation radars. They keenly noticed that compared to the single frequency radar used on TRMM satellites, the dual frequency precipitation radar performs better in practical applications. Ku and Ka dual frequency precipitation measurement radars can combine the advantages of high radar observation resolution and wide satellite observation range, "said Jiang Bosen, director of the Microwave Remote Sensing Technology Research Office at 704 Institute. The Ku frequency band is conducive to detecting strong precipitation, while the Ka frequency band is conducive to detecting weak precipitation. Working together, the two can expand precipitation detection capabilities, even for drizzle of 0.2 millimeters per hour, accurate perception can be achieved. In addition, utilizing the different scattering characteristics of precipitation particles on radar signals of different frequency bands, dual frequency measurement can distinguish rain, snow, hail, etc., and detect liquid and solid changes during precipitation, which is very important in meteorological applications. At that time, the Global Precipitation Observation Program (GPM) jointly implemented by the United States and Japan was soon launched, and spaceborne dual frequency precipitation radars were also in the exploratory stage internationally. At that time, we thought, 'If you want to do it, do it the best,' "said Johnson. At the Meteorological Satellite Development Forum held in 2006, the development of domestically produced precipitation measurement satellites became a consensus. 704 Institute bravely "unveiled" and shouldered the heavy responsibility of developing the satellite's main payload precipitation measurement radar. Make every effort to create a "ruler", which is the first time China has developed a spaceborne precipitation measurement radar