Survivability model of LEO satellite constellation based on GERT with limited backup resources  

作　　者：NIE Yuanyuan FANG Zhigeng LIU Sifeng GAO Su 

机构地区：[1]College of Economics and Management,Nanjing University of Aeronautics and Astronautics,Nanjing 211106,China [2]Institute of Telecommunication Satellite,China Academy of Space Technology,Beijing 100094,China

出　　处：《Journal of Systems Engineering and Electronics》2024年第4期976-986,共11页系统工程与电子技术（英文版）

基　　金：This work was supported by the National Natural Science Foundation of China(72271124,52232014,72071111,71801127,71671091).

摘　　要：Survivability is used to evaluate the ability of the satellite to complete the mission after failure,while the duration of maintaining performance is often ignored.An effective backup strategy can restore the constellation performance timely,and maintain good network communication performance in case of satellite failure.From the perspective of network utility,the low Earth orbit(LEO)satellite constellation survivable graphical eva-luation and review technology(GERT)network with backup satel-lites is constructed.A network utility transfer function algorithm based on moment generating function and Mason formula is proposed,the network survivability evaluation models of on-orbit backup strategy and ground backup strategy are established.The survivable GERT model can deduce the expected mainte-nance time of LEO satellite constellation under different fault states and the network utility generated during the state mainte-nance period.The case analysis shows that the proposed surviv-able GERT model can consider the satellite failure rate,backup satellite replacement rate,maneuver control replacement ability and life requirement,and effectively determine the optimal sur-vivable backup strategy for LEO satellite constellation with limi-ted resources according to the expected network utility.

关 键 词：SURVIVABILITY low Earth orbit(LEO)satellite constella-tion graphical evaluation and review technology(GERT) backup strategy 

分 类 号：TN927.2[电子电信—通信与信息系统] V474[电子电信—信息与通信工程]