CHAN算法在LOS和NLOS环境下的定位研究

发布时间：2018-05-18 20:38

本文选题：时间到达差 + CHAN算法　；参考：《计算机技术与发展》2015年09期

【摘要】：在基于时间到达差(Time Difference Of Arrival,TDOA)的定位估计算法中,CHAN算法计算量小,能够在视距(Line Of Sight,LOS)传播环境下获得较高的定位精度,因而被广泛应用。但是在非视距传播环境(Non-Line Of Sight,NLOS)下,该算法的定位性能会明显下降。因为在非视距情况,尤其是密集城区,由于建筑物等障碍物的存在使得无线电信号无法直线传播,这就引入了NLOS误差;而CHAN算法中的加权矩阵只考虑了系统误差,无法消除NLOS误差。文中在基于视距环境下CHAN算法的研究基础上,对非视距引入的NLOS误差的统计特性进行分析,给出一种在NLOS情况下,通过优化非视距TDOA测量值误差的方法来改善非视距下的CHAN算法性能,并通过仿真分析了CHAN算法在不同环境模型下的定位性能。仿真结果表明,改善的CHAN算法在NLOS环境下能取得较好的定位性能。
[Abstract]:In the localization estimation algorithm based on time-of-arrival difference time Difference of Arrivalo, the Chan algorithm has less computation and can obtain high positioning accuracy under the condition of line-of-sight line of SightSightShop propagation environment, so it is widely used. But in the non-line-of-sight propagation environment (Non-Line of SightSightNLOS), the localization performance of the algorithm will be significantly reduced. In the case of non-line-of-sight, especially in dense urban areas, because of the existence of obstacles such as buildings, the radio signal can not propagate in a straight line, so the NLOS error is introduced, and the weighting matrix in the CHAN algorithm only takes into account the system error. NLOS error cannot be eliminated. In this paper, based on the research of CHAN algorithm in the visual range environment, the statistical characteristics of the NLOS error caused by the non-line-of-sight are analyzed, and a kind of NLOS error in the case of NLOS is given. The performance of the CHAN algorithm is improved by optimizing the measurement error of the nonline-of-sight TDOA, and the localization performance of the CHAN algorithm under different environment models is analyzed by simulation. Simulation results show that the improved CHAN algorithm can achieve better localization performance in NLOS environment.
【作者单位】：南京邮电大学江苏省无线通信重点实验室;
【基金】：国家自然科学基金资助项目(61271236) 工业和信息化部通信软科学项目(2014-R-50) 江苏政府留学奖学金资助项目南京邮电大学校项目(NY210007);南京邮电大学大学生创新训练计划省级重点项目(SZDG2013012)
【分类号】：TN929.5

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