Fengyun-4 B star obtains high-precision images, and the changes of Fengyun are visible to the naked eye.
High-precision images obtained by Fengyun-4 B star
The first one
It is equipped with the world’s first day and night high frequency imaging instrument.
First batch
Successfully acquired the first batch of high-precision images and data.
first time
Clearly see the minute-level wind and cloud change process with the naked eye.
First time
Realize the wish of "seeing where there is a disaster quickly"
The Weather Forecast broadcast on July 1st published a satellite cloud picture, which attracted the attention of many netizens. This is the first operational star of a new generation of geostationary meteorological satellites in China — — The first batch of high-precision and high-efficiency visible light observation images successfully obtained by Fengyun-4 B star.
On the full-disk satellite cloud image, the snow in Tianshan Mountain, the surface texture of lakes and Hetao areas in Qinghai-Tibet Plateau, convective clouds in Northeast China and North China, and vortex clouds in high latitudes in the northern and southern hemispheres are clearly visible.
These images can visually show the fine structure of convective clouds, and the temporal and spatial resolution is increased from 5 minutes and 500 meters to 1 minute and 250 meters respectively, which improves the continuous and rapid monitoring ability of small and medium-sized clouds, and is of great significance for the monitoring and early warning of severe convective weather, especially for the monitoring of sudden small and medium-sized weather systems.
Fengyun-4 b star successfully acquired
The first batch of high-precision images and data
Fengyun-4 B satellite was successfully launched on June 3, and it is the first operational satellite of the second generation geostationary meteorological satellite in China. It is mainly used in weather analysis and forecasting, environment and disaster monitoring and other fields. The satellite, which is in the on-orbit test, successfully obtained the first batch of high-precision data and image products. On the full-disk satellite cloud image, the snow in Tianshan Mountain, the surface texture of lakes and Hetao areas in Qinghai-Tibet Plateau, convective clouds in Northeast China and North China, and vortex clouds in high latitudes in the northern and southern hemispheres are clearly visible. On the panchromatic image products with a resolution of 1 minute and 250 meters and the image and animation products with a resolution of 500 meters, the fine structure and development process of convective clouds can be seen at a glance. It is worth mentioning that this product generation uses machine learning technology to realize true color atmospheric correction.
Carrying the world’s first
Day and night high frequency secondary imaging instrument
The fast imager carried by the satellite is the world’s first day-and-night high-frequency imaging instrument, which can provide one-minute interval multi-spectral continuous observation in an area of 2,000 km× 2,000 km, making the monitoring of typhoons, rainstorms and mesoscale disastrous weather more flexible and precise. The advanced geostationary orbit radiation imager adds the function of low-level water vapor imaging, which enhances the quantitative observation ability of the surface and clouds. The geostationary orbit radiation imager and the fast imager cooperate with each other, which not only ensures the multi-spectral effect required by geostationary orbit atmospheric remote sensing, but also has the observation ability of high temporal and spatial resolution.
Tang Shihao, chief designer of Fengyun Meteorological Satellite Engineering Application System, said that Fengyun-4 B-star made it possible for people to clearly see the minute-level change process with the naked eye for the first time, and also realized the wish of "seeing where there is a disaster quickly". In addition, the variety of B-star products has increased significantly, which can provide observation support for meteorological forecasting, disaster prevention and mitigation, response to climate change, and ecological civilization construction, especially for monitoring and early warning of major disasters such as typhoons, floods and droughts.
Data daily service capacity
Increase by 50%
Lu Feng, chief designer of the optical satellite ground system of Fengyun-4 geostationary meteorological satellite, said that in order to ensure the long-term stability of satellite observation and data, the service life of Fengyun-4 B star is 7 years. The ground application system will build a brand-new core business system to give full play to satellite benefits. The daily data processing capacity of Fengyun-4 B star is about 1.2 times that of Fengyun-4 A star, and the daily data service capacity is improved by 50%.
In the next step, Fengyun-4 B star will conduct a one-year on-orbit test, test and apply, and release products in batches. Fengyun-4 star B will also form a networking advantage with star A, and will be strong in key areas and important weather process monitoring to provide more abundant observation products. According to CCTV News and China Weather Network,
Quick and accurate reality
Fengyun no.4 b star
Three characteristics to upgrade meteorological service
After the launch, Fengyun-4 B star was fixed at 123.5 degrees east longitude, and joined hands with Fengyun-4 A star. The observation range reached the Indian Ocean in the west and crossed the international date line of the Pacific Ocean in the east, which not only completely covered China’s territory, but also covered a wider area such as the Northwest Pacific Ocean and Oceania, enabling China’s second-generation geostationary meteorological satellite to realize the business model of two-star operation and east-west layout.
Fengyun-4 B-star service will be upgraded on the basis of A-star, and a high-speed, reliable, all-weather and all-weather data processing, transmission and distribution system will be built to ensure the meteorological service of meteorological data end users and serve the national economy and people’s livelihood.
Fast: every second will ensure efficiency.
As a geostationary meteorological satellite, obtaining high time resolution observation data is the primary task of Fengyun-4 B satellite, and data processing, transmission and distribution are irreplaceable links. Therefore, as the overall unit of the satellite, 509 Institute of the Eighth Academy of Aerospace Science and Technology Group, together with users and contractors, has built a high-speed data processing, transmission and distribution system between the satellite and the ground. Using the satellite-ground high-speed data system, the B-satellite remote sensing load is sent to the earth data transmission subsystem for data processing while acquiring remote sensing data, and then transmitted to the ground station for data processing through the satellite-ground high-speed data transmission channel.
After being processed by the ground station, the generated meteorological products will be quickly distributed to the fixed meteorological stations at all levels in provinces, cities and counties and the vehicle-borne and ship-borne mobile receiving terminals in the satellite coverage area through the high-speed information forwarding channel and the low-speed information forwarding channel of the satellite-to-ground forwarding system. Using the satellite-ground high-speed data system, it takes only a few minutes to obtain remote sensing data from remote sensing load to reach the end users, and it can provide high-frequency meteorological data for ships in China and its surrounding areas and sea areas.
Accurate: data "express" to ensure quality
Meteorological satellites are called "the first line of defense for disaster prevention and mitigation" by the industry because the remote sensing data detected by satellites are the first-hand data for monitoring and predicting the development and trend of severe weather. Therefore, satellite remote sensing data when bad weather occurs is particularly important.
By adopting a number of technologies, Fengyun-4 B-star ensures that data transmission is not afraid of typhoons and rainstorms, and can be stably and reliably transmitted to ground stations, assisting meteorological units to make accurate weather forecasts and reducing the losses that bad weather may bring to national lives and property.
Reality: self-upgrading to protect people’s livelihood
In order to further improve the application efficiency of B-star as the first operational satellite of Fengyun-4 series, this time, the research team carried out a "self-upgrade" of the satellite-ground data transmission and distribution system, which really made users experience convenience and speed.
In order to further bring special vehicles, small and medium-sized ships and other mobile platforms into the service group of low-speed information forwarding channel, the output power of the downlink power amplifier of Fengyun-4 B-star low-speed information forwarding channel is doubled, and the antenna diameter of the ground receiving terminal is reduced by 0.3 times, which solves the problem that it is difficult to install receiving equipment on mobile platforms such as vehicles and small and medium-sized ships.
At the same time, in order to adapt to the application scenarios where the moving direction of mobile terminals such as vehicles and ships changes in real time, and improve the experience of data forwarding service, the research team changed the polarization direction of downlink microwave signals in the high-speed information forwarding channel and the low-speed information forwarding channel of the satellite-to-ground forwarding system from horizontal vertical double-line polarization to left-right rotation double-circle polarization, thus solving the problems of polarization isolation reduction and data reception error or interruption caused by the direction change of the receiving platform.
Fengyun-4 B-Star has also added a high-speed Ka-band high-speed original remote sensing data transmission channel, which supports the real-time transmission of high-speed remote sensing data to the ground when a typhoon or local disastrous weather area occurs, thus improving China’s emergency capabilities such as forecasting and monitoring disastrous weather and reducing the loss of life and property of the people of the country.
Xinhua News Agency reporter Hu Zhe Huang Wei