一种改进的NLOS环境下的TDOA/AOA混合定位算法

在蜂窝移动通信系统中，利用基站测量的到达时间差(TDOA)和电波到达角(AOA)的混合定位方法能够比传统的TDOA方法提供更高的定位精度。但是在非视距(NLOS)条件下，当AOA的测量误差超过一定值时，定位的误差仍然很大。该文根据NLOS传播环境下附加传播时延服从指数分布的特性，估计附加时延的均值和方差，对TDOA测量值进行重构，再以AOA方法进行辅助定位。仿真结果表明，该算法能显著提高传统的TDOA和TDOA/AOA方法在NLOS传播环境下的定位精度。

An Improved Hybrid TDOA/AOA Location Algorithm in NLOS Environment

In cellular mobile communication systems, the hybrid Time Difference Of Arrival(TDOA) and the Angle Of Arrival(AOA) location algorithm can reach higher accuracy than traditional TDOA method does. But in NLOS environment, when the measurement error of AOA surpasses a certain value, the location error is still large. This paper proposes an effective location method on the condition that the excessive time delay in NLOS environment is exponential. This method estimates the mean and variances of the excessive time delay based on its statistical property firstly and then reconstructs the TDOA for migrating the influence of the NLOS error. Then use the AOA algorithm as the assistant method. The result of simulation proves its effectiveness in improving the location accuracy than traditional TDOA and TDOA/AOA method in NLOS propagation environment.