即单节点保护算法可以保护除失效节点之外的其余组播群成员。
The single node protection algorithm can protect every group member except the failure member.
根据失效节点和观测粗差对残差影响的差异，提出分步处理的方法。
According on the difference of influence imposed on residual by fault points and gross errors of observation, the method of processing step by step is put forward.
如果不能确定网络是连通的，再触发失效节点的其它可达邻近节点响应。
If the responding nodes could not ensure that the network is connected, the other reachable nodes from the fault node are further triggered.
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