这两种算法均利用邻居节点间的通讯约束关系构建样本空间，从而提高算法的定位精度。

Both algorithms take advantage of the communication relationship with the neighbor node, build the sample space, to improve the positioning accuracy.

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针对双基站卫星星座的特点，分析了卫星和空间站之间的可视窗、通讯窗和过顶时间要求下的通讯约束。

Visualization window, communication window and communication constraint satisfied over-time between satellites and space station were presented according to the characters of two-station-system.

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在所有的软件和系统开发中都存在着通过语言、硬件、网络拓扑、通讯协议和底层架构等选择所带来的重要约束。

In all software and system development there are important constraints implied by the choice of languages, hardware, network topology, communications protocols and infrastructure, and so on.

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