Three-axis stabilized Fengyun-4 （FY-4） satellite scries is the new generation of geostationary meteorological satellite in China. The ob-servation flexibility brought by three-axis stabilization makes it possible to...Three-axis stabilized Fengyun-4 （FY-4） satellite scries is the new generation of geostationary meteorological satellite in China. The ob-servation flexibility brought by three-axis stabilization makes it possible to design different observation modes for different targets. Important observation modes of the Advanced Geosynchronous Radiation Imager （AGRI）, the core instrument onboard FY-4A, are presented, from the earth obser- vation, navigation and calibration perspective. As the time consumed in full disk and hemisphere observations exceed the time limitation, different region segmentation methods are proposed. Results show the methods are effective, and the full disk as well as hemisphere observations can both be accomplished in the given time. Finally the three-region segmentation method and two-region segmentation method are chosen for full disk and hemisphere observations, respectively, in view of the observation instructions＇ complexity as well as the time consuming. The research results paved the way for the core instrument＇s daily operation, and have been used in FY-4A in-orbit test.展开更多
基于可信计算技术中的可信根、信任链和可信存储的概念,设计并实现了一种基于TCM(trusted cryptographymodule)的全盘加密系统(full disk encryption system,FDES)。FDES系统具有加密和认证功能,利用device-mapper(DM)提供的从逻辑设备...基于可信计算技术中的可信根、信任链和可信存储的概念,设计并实现了一种基于TCM(trusted cryptographymodule)的全盘加密系统(full disk encryption system,FDES)。FDES系统具有加密和认证功能,利用device-mapper(DM)提供的从逻辑设备到物理设备的映射框架机制,嵌入在Linux内核中,利用TCM芯片提供的加密、认证和存储等功能,实现对全部硬盘的透明加解密功能,从而确保了安全机制的不可旁路性和可靠性。展开更多
基金Supported by Tsinghua University Horizontal Project(412412)National Natural Science Foundation of China(91338109,61172113)
文摘Three-axis stabilized Fengyun-4 （FY-4） satellite scries is the new generation of geostationary meteorological satellite in China. The ob-servation flexibility brought by three-axis stabilization makes it possible to design different observation modes for different targets. Important observation modes of the Advanced Geosynchronous Radiation Imager （AGRI）, the core instrument onboard FY-4A, are presented, from the earth obser- vation, navigation and calibration perspective. As the time consumed in full disk and hemisphere observations exceed the time limitation, different region segmentation methods are proposed. Results show the methods are effective, and the full disk as well as hemisphere observations can both be accomplished in the given time. Finally the three-region segmentation method and two-region segmentation method are chosen for full disk and hemisphere observations, respectively, in view of the observation instructions＇ complexity as well as the time consuming. The research results paved the way for the core instrument＇s daily operation, and have been used in FY-4A in-orbit test.
文摘基于可信计算技术中的可信根、信任链和可信存储的概念,设计并实现了一种基于TCM(trusted cryptographymodule)的全盘加密系统(full disk encryption system,FDES)。FDES系统具有加密和认证功能,利用device-mapper(DM)提供的从逻辑设备到物理设备的映射框架机制,嵌入在Linux内核中,利用TCM芯片提供的加密、认证和存储等功能,实现对全部硬盘的透明加解密功能,从而确保了安全机制的不可旁路性和可靠性。
