一种新的基于WCDMA系统的基站选择定位算法

A new location algorithm for BS selection based on WCDMA system

非视距(NLOS)是影响各种蜂窝网络定位精度的主要原因.提出了一种新的基站选择定位算法,算法基于到达时间差(TDOA)计算距离.首先利用NLOS环境下距离测量样本的标准差大于LOS环境下的标准差这一前提,判断测量样本中是否含有NLOS误差.然后从测量值中选出含有NLOS误差最小的2个基站,将其重构出LOS测量值,再采用3基站算法进行定位计算.仿真表明,该算法比其他算法在定位精度方面有明显的提高.

NLOS was the major factor that affected cellular network location precision. A new location algorithm for BS selection was proposed and this algorithm was based on TDOA measurement. Firstly, whether NLOS error is included in measured samples is determined with the precondition that the standard deviation of distance of measured samples in NLOS environment is bigger than that in LOS environment. Secondly, two BS＇s containing the smallest NLOS error were chosen and the LOS measurements were reconstructed. Lastly three-BS algorithm is used to compute BS location. Simulation shows that this algorithm improves evidently the location precision.