普适计算中定位服务的参考点选择及误差分析

通过分析多边定位法在未知节点的定位过程中产生的定位误差,提出并证明了有关定位参考点布置的三个定理,使在普适计算环境中可通过有针对性地布置参考点的位置来减小未知节点的定位误差.在此基础上提出定位参考点选择算法,该算法以参考点间的位置关系为基础,通过选择合适的参考点对未知节点进行定位.仿真实验结果表明所提出的定位参考点布置定理及选择算法能满足普适计算环境中移动对象实时定位的需求,并具有较高的定位精度.

Reference Point Selection of Locating Service and Error Analysis in Ubiquitous Computing

The paper proposes and proves three theorems of location reference point placement based on the analysis of the location error produced when an unknown node is located using the multilateral localization method.Therefore the location error can be reduced through purposive placement of the reference points in the ubiquitous computing environment.The location reference point selection algorithm is proposed.This algorithm bases on the relative position of reference points and selects the optimum reference points to locate the unknown node.The simulation experiment results indicate that the location reference point placement theorems & selection algorithm can meet the requirement of mobile node's real-time location in the ubiquitous computing environments and possesses the preferable location precision.