求翻译：在分布区域布置若干信任节点（这里以5个为例），在整个区域选出若干节点作为测试节点，在系统启动前信任节点收集这些测试节点的信号强度值，从而建立相应的离线数据库，在系统运行过程中，未知节点测得这些信任节点的信号强度值，将该值与数据库中的记录进行比较，计算信号强度的方差，选取方差最小的记录点作为该未知节点的位置。是什么意思？

Regional arrangement in the distribution of the trust node (5, for example), to elect the number of nodes as a test node in the system before the start of the trust node to collect these test node signal strength value in the region as a whole, in order to establish the off-line database, system is

In the distribution area are well trusted nodes (here a number 5, for example) in the region as a whole several nodes selected as a test node in the system, and confidence-building before starting the test node node collection of signal intensity value, so as to create the offline database, while th

In distributes the region to arrange certain trust node (here take 5 as example), selects certain nodes in the entire region to take the test node, trusts the node before the system initiation to collect these test node the signal intensity value, thus establishes the corresponding off-line database

In distribution regional layout several trust node (here to 5 a for cases), in entire regional elected several node as test node, in system started Qian trust node collection these test node of signal strength value, thus established corresponding of offline database, in system run process in the, u

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