基于射线跟踪的AOA定位算法的GDOP研究

GDOP study of the ray tracing based AOA positioning algorithm

GDOP是衡量定位系统精度的一个重要指标。基于射线跟踪的定位算法利用镜像站实现对目标的定位,针对现有关于GDOP的计算因没有考虑镜像站之间的相关性,而无法用于对基于射线跟踪的定位系统的定位精度与镜像站布局之间规律进行分析的问题,给出一种基于射线跟踪的AOA定位算法(AOA-RT)的GDOP计算方法。在微小区AOA定位模型下,根据镜像站与定位站之间的关系,得到镜像站位置误差的相关矩阵,根据该相关矩阵推导了AOA-RT算法的GDOP的计算公式。仿真结果表明了所给的GDOP计算方法的合理性,并得出了相关结论。

GDOP is an important index to measure the precision of the positioning system.The ray tracing-based localization algorithm uses the mirror station to locate the target.In view of the problem that the existed GDOP calculation methods do not consider the correlation between the image base stations(I-BS)and hence cannot analyze the relationship between the accuracy and the I-BS layout of the ray tracing based positioning system,this paper proposes a GDOP calculation method for the ray tracing based AOA positioning algorithm(AOA-RT).In the micro-cell AOA location model,according to the relationship between the I-BSs and the base station,the correlation matrix of position errors of I-BSs is obtained,and the calculation formula of the GDOP is derived.The simulation proves that the GDOP calculation method is reasonable,and we get several related conclusions.