摘要
本文提出一种基于OFDM信号的联合TOA/AOA的二维定位方法。根据信道的频率响应(CFR),算法采用超分辨率估计算法,估计首达路径(First Arrival Path,FAP)的传输时延,即TOA估计。利用天线阵列,在频域利用同样的超分辨率估计算法,估计信号各径的AOA。联合首达路径的TOA和AOA信息,可在二维平面上确定目标位置。对于AOA的估计,采用波束成形,结合各径信道脉冲响应(CIR)幅值,甄别出首径的AOA。在多径环境下仿真,结果表明算法有效且定位精度满足实际需要,特别适合只有一个基站或接入点的室内定位。
A jointed TOA/AOA super-resolution algorithm for OFDM positioning is proposed. Basing on obtained channel frequency response （CFR）, the super-resolution algorithm is executed to estimate the transmission delay of the first arrival path （FAP）, namely the signal＇s TOA. Using the same super-resolution algorithm in frequency domain,the angle of signal arrivals from a mobile device to a base station and/ or an access point is estimated in virtue of antenna array. Then,the estimated TOA and DOA messages are jointed to compute the position of mobile station in two-dimension plane. In AOA estimation process, the beam-forming and CIR amplitudes of paths is integrated to choose the AOA of the FAP. In multipaths en- vironment, the simulation results show that the positioning precision of the proposed algorithm is high enough for actual application, especially in the environment with only one access point and base station.
出处
《传感技术学报》
CAS
CSCD
北大核心
2009年第7期988-992,共5页
Chinese Journal of Sensors and Actuators
基金
国家自然科学基金项目资助(50534050)
