REMEMBER the days when people used to have a phone, a computer and a camera？ I do - simply because it wasn＇t that long ago. However, as technology hurtles along at the speed of light, it might have escaped some peo...REMEMBER the days when people used to have a phone, a computer and a camera？ I do - simply because it wasn＇t that long ago. However, as technology hurtles along at the speed of light, it might have escaped some people＇s attention that all these three devices now come together in the form of a smartphone, There＇s no need to carry all three devices when visiting a tourist site or monument - your handy smartphone can take a picture, log on to the Internet to post your picture on social media, and then use the calling function to tell your friends about the pictures you＇ve just posted.展开更多
The execution process of satellite-ground clock synchronization and ephemeris uploading in the system is analyzed,as well as their characterized operation and their relationship.Based on the analysis of the scheduling...The execution process of satellite-ground clock synchronization and ephemeris uploading in the system is analyzed,as well as their characterized operation and their relationship.Based on the analysis of the scheduling goal and constraint character,a heuristics rule-based multi-stage link scheduling algorithm was put forward.The algorithm distinguishes the on-off-frontier satellites from the others and schedules them by turns.The paper presented the main flow as well as the detailed design of the rule.Finally based on the current COMPASS global system,some typical resources and constraints are selected to generate an instance.Then the comparison analysis between the heuristics scheduling algorithm and three other traditional scheduling strategies are carried out.The result shows the validity and reasonability of the multi-stage strategy.展开更多
文摘REMEMBER the days when people used to have a phone, a computer and a camera？ I do - simply because it wasn＇t that long ago. However, as technology hurtles along at the speed of light, it might have escaped some people＇s attention that all these three devices now come together in the form of a smartphone, There＇s no need to carry all three devices when visiting a tourist site or monument - your handy smartphone can take a picture, log on to the Internet to post your picture on social media, and then use the calling function to tell your friends about the pictures you＇ve just posted.
基金National Natural Science Foundations of China(Nos.71201171,71501179)
文摘The execution process of satellite-ground clock synchronization and ephemeris uploading in the system is analyzed,as well as their characterized operation and their relationship.Based on the analysis of the scheduling goal and constraint character,a heuristics rule-based multi-stage link scheduling algorithm was put forward.The algorithm distinguishes the on-off-frontier satellites from the others and schedules them by turns.The paper presented the main flow as well as the detailed design of the rule.Finally based on the current COMPASS global system,some typical resources and constraints are selected to generate an instance.Then the comparison analysis between the heuristics scheduling algorithm and three other traditional scheduling strategies are carried out.The result shows the validity and reasonability of the multi-stage strategy.
