China＇s commercial space activities started from the launch of Asiasat- I satellite by a LM-B launch vehicle on April 7, 1990. As the leading force in ChinEs space industry, CASC has been committed to commercial spac...China＇s commercial space activities started from the launch of Asiasat- I satellite by a LM-B launch vehicle on April 7, 1990. As the leading force in ChinEs space industry, CASC has been committed to commercial space for nearly 30 years. The article describes CASC＇s advantages and activities in commercial space sector, as well as outlook for CASC commercial space development. The author concludes CASC is willing to coordinate and cooperate with state-owned and private companies and will create a new pattern for commercial space, opening up a new industry for space development and achieving more splendid achievement.展开更多
LM-6,China’s new generation launch vehicle,achieved a successful launch at12：50 Beijing time on November 21,2017 from the Taiyuan Satellite Launch Center.It was the first commercial launch mission of LM-6 since its ...LM-6,China’s new generation launch vehicle,achieved a successful launch at12：50 Beijing time on November 21,2017 from the Taiyuan Satellite Launch Center.It was the first commercial launch mission of LM-6 since its successful maiden flight in 2015.The LM-6carrier rocket carried 3＂Jilin-1＂video satellites into space and accurately placed them into their preset orbits.LM-6 is an important member of the nation’s family of new generation of launch vehicles.展开更多
The broadband emissivity is an important parameter for estimating the energy balance of the Earth. This study focuses on estimating the window （8 -12 μm） emissivity from the MODIS （mod- erate-resolution imaging sp...The broadband emissivity is an important parameter for estimating the energy balance of the Earth. This study focuses on estimating the window （8 -12 μm） emissivity from the MODIS （mod- erate-resolution imaging spectroradiometer） data, and two methods are built. The regression method obtains the broadband emissivity from MODllB1 - 5KM product, whose coefficient is developed by using 128 spectra, and the standard deviation of error is about 0.0118 and the mean error is about O. 0084. Although the estimation accuracy is very high while the broadband emissivity is estimated from the emissivity of bands 29, 31 and 32 obtained from MOD11B1 _ 5KM product, the standard deviations of errors of single emissivity in bands 29, 31, 32 are about 0.009 for MOD11B1 5KM product, so the total error is about O. 02 and resolution is about 5km × 5km. A combined radiative transfer model with dynamic learning neural network method is used to estimate the broadband emis- sivity from MODIS 1B data. The standard deviation of error is about 0.016, the mean error is about 0.01, and the resolution is about 1 km x 1 km. The validation and application analysis indicates that the regression is simpler and more practical, and estimation accuracy of the dynamic learning neural network method is higher. Considering the needs for accuracy and practicalities in application, one of them can be chosen to estimate the broadband emissivity from MODIS data.展开更多
The FY-4 satellite arrived at the Xichang Satellite Launch Center on October 23 and prepares for launch scheduled in the mid of December.The FY-4 satellite had completed all testing including integrated satellite micr...The FY-4 satellite arrived at the Xichang Satellite Launch Center on October 23 and prepares for launch scheduled in the mid of December.The FY-4 satellite had completed all testing including integrated satellite micro-vibration test,image navigation and registration test,展开更多
China successfully launched FY-3D by a LM-4C carrier rocket from the Taiyuan Satellite Launch Center at 02：35 Beijing time on November 15.The mission also carried the HEAD-1experiment satellite which was developed by...China successfully launched FY-3D by a LM-4C carrier rocket from the Taiyuan Satellite Launch Center at 02：35 Beijing time on November 15.The mission also carried the HEAD-1experiment satellite which was developed by SAST.The LM-4C carrier rocket was developed by SAST.22 technological improvements were made for this launch mission to meet the satellite’s requirement and improve the flight reliability.So far,展开更多
The GF-3 satellite was successfully launched at 06：55 Beijing time on August10 using a LM-4C launch vehicle from the Taiyuan Satellite Launch Center.The launch was the 233rd flight of a LM family launch vehicle and t...The GF-3 satellite was successfully launched at 06：55 Beijing time on August10 using a LM-4C launch vehicle from the Taiyuan Satellite Launch Center.The launch was the 233rd flight of a LM family launch vehicle and the carrier rocket LM-4C was developed by the Shanghai Academy of Spaceflight Technology.展开更多
文摘China＇s commercial space activities started from the launch of Asiasat- I satellite by a LM-B launch vehicle on April 7, 1990. As the leading force in ChinEs space industry, CASC has been committed to commercial space for nearly 30 years. The article describes CASC＇s advantages and activities in commercial space sector, as well as outlook for CASC commercial space development. The author concludes CASC is willing to coordinate and cooperate with state-owned and private companies and will create a new pattern for commercial space, opening up a new industry for space development and achieving more splendid achievement.
文摘LM-6,China’s new generation launch vehicle,achieved a successful launch at12：50 Beijing time on November 21,2017 from the Taiyuan Satellite Launch Center.It was the first commercial launch mission of LM-6 since its successful maiden flight in 2015.The LM-6carrier rocket carried 3＂Jilin-1＂video satellites into space and accurately placed them into their preset orbits.LM-6 is an important member of the nation’s family of new generation of launch vehicles.
基金Supported by the National Program on Key Basic Research Project(No.2010CB951503,2013BAC03B00,2012AA120905)
文摘The broadband emissivity is an important parameter for estimating the energy balance of the Earth. This study focuses on estimating the window （8 -12 μm） emissivity from the MODIS （mod- erate-resolution imaging spectroradiometer） data, and two methods are built. The regression method obtains the broadband emissivity from MODllB1 - 5KM product, whose coefficient is developed by using 128 spectra, and the standard deviation of error is about 0.0118 and the mean error is about O. 0084. Although the estimation accuracy is very high while the broadband emissivity is estimated from the emissivity of bands 29, 31 and 32 obtained from MOD11B1 _ 5KM product, the standard deviations of errors of single emissivity in bands 29, 31, 32 are about 0.009 for MOD11B1 5KM product, so the total error is about O. 02 and resolution is about 5km × 5km. A combined radiative transfer model with dynamic learning neural network method is used to estimate the broadband emis- sivity from MODIS 1B data. The standard deviation of error is about 0.016, the mean error is about 0.01, and the resolution is about 1 km x 1 km. The validation and application analysis indicates that the regression is simpler and more practical, and estimation accuracy of the dynamic learning neural network method is higher. Considering the needs for accuracy and practicalities in application, one of them can be chosen to estimate the broadband emissivity from MODIS data.
文摘The FY-4 satellite arrived at the Xichang Satellite Launch Center on October 23 and prepares for launch scheduled in the mid of December.The FY-4 satellite had completed all testing including integrated satellite micro-vibration test,image navigation and registration test,
文摘China successfully launched FY-3D by a LM-4C carrier rocket from the Taiyuan Satellite Launch Center at 02：35 Beijing time on November 15.The mission also carried the HEAD-1experiment satellite which was developed by SAST.The LM-4C carrier rocket was developed by SAST.22 technological improvements were made for this launch mission to meet the satellite’s requirement and improve the flight reliability.So far,
文摘The GF-3 satellite was successfully launched at 06：55 Beijing time on August10 using a LM-4C launch vehicle from the Taiyuan Satellite Launch Center.The launch was the 233rd flight of a LM family launch vehicle and the carrier rocket LM-4C was developed by the Shanghai Academy of Spaceflight Technology.
