如何保证双机系统的强实时性、高可用度和服务“不断流”，一直是双机系统实现的关键技术难点。
How to ensure the hard real time, the high availability and the "non stop" service are key problems in dual systems.
要在有限的保障经费下实现高可用度要求，就必须建立装甲装备的使用可用度与维修保障费用的优化模型。
Optimization models of armored equipment operational availability and maintenance support cost must be established in order to achieve availability objective under limited support cost.
在进行系统工程设计时，低可用度系统需要预留一定的雨衰余量，高可用度系统需要采取自适应抗雨衰措施。
For system design, it is necessary to provide certain link margin for low availability. However in order to obtain high availability, we need explore adaptive fade mitigation technology.
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