普适计算中定位单元布局研究

Research on Deployment of Locating Unit in Ubiquitous Computing

普适计算环境中未知移动节点的位置信息是定位服务要解决的关键技术。在普适计算二维空间定位过程中,通过对三角形定位单元区域的误差分析,提出了定位单元布局(LUD)定理。在此基础上,对多个定位单元布局进行了研究,定义了一个新的描述定位单元中定位参考点覆盖效能的物理量——覆盖基,提出了在误差最小情况下定位单元布局的覆盖基定理。仿真实验表明定位单元布局定理能更好地满足对普适终端实时定位的需求,且具有较高的精度和最大覆盖效能。

Getting location information of an unknown mobile node is a key point of locating service in the ubiquitous computing environment. The errors due to locating an triangular area was studied in the 2-D space as a pervasive computing environment. And the theorem of a locating unit deployment（LUD） was presented. Based on the finding, a new physical property parameter of coverage, coverage base,was defined and introduced for the first time. And, the deploy- ment issue between locating units was also studied, as a result, the theorem of coverage base about locating units was proposed in minimum error condition. The simulation tests indicate that the locating unit deployment theorem can meet the requirement of ubiquitous terminal＇s real-time localization and possesses the preferable localization precision.