一种移动蜂窝网对动态目标监测基站选择技术

A Base Station Selection Technology for Dynamic Targets Monitoring in Mobile Cellular Network

在移动蜂窝网中,固定基站阵的定位监测精度会随着干扰源的移动远离而下降,故此需要研究如何在蜂窝结构的基站群中动态选择基站阵对不同位置的干扰源进行定位,以提高定位精度。通过分析移动蜂窝网基站阵列特点以及对比不同基站数目的TDOA算法定位性质,提出一种基于最临近点的基站选择算法,结合蜂窝网结构特点分别给出了三基站到七基站阵的选择算法。上述算法可以随着移动定位点动态选择定位基站阵,并在距离最小的意义下达到最优或次最优。仿真中对比了固定站点和动态基站切换在不同噪声强度下的测量误差以及不同基站数目对动态目标点轨迹的定位误差,结果表明在TDOA算法下,采用动态基站切换算法比采用固定站点定位精度得到有效提升。

In mobile cellular networks,the positioning accuracy of fixed base station array declines with the movement of dynamic interference sources, so it is necessary to study the dynamic base station selection in the mobile cellular networks to improve the positioning accuracy. After analysing the characteristics of the mobile cellular network and comparing the positioning properties of TDOA algorithm with different number of base stations, this paper proposes a base station selection method based on the nearest point algorithm, and the selection algorithm of three base stations to seven base stations array is given according to the structure characteristics of cellular network. In the positioning process, this algorithm can guarantee the mobile interference source is in the convex polygon formed by the selected honeycomb monitoring station and achieves optimal or suboptimal in the sense of nearest distance. In the simulation, the measurement errors of fixed station and dynamic base station under different noise intensity were compared, the positioning errors of different base station numbers to dynamic target trajectory were also analyzed. The simulation results show that the positioning accuracy of dynamic base station handover algorithm is significantly improved compared with that of fixed station under TDOA algorithm.