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针对单一网络下的UE定位已经不能满足用户的定位需求的问题,提出了一种在LTE、WCDMA以及TD-SCDMA多基站共存的异构网络中一种OTDOA定位方案。本方案先对定位坐标进行残差加权重计算,然后采用综合了Chan氏算法和Taylor级数算法的改进定位算法计算位置,并在理想的信道环境和典型的实际信道模型下进行了异构网络下的定位仿真。在LTE网络信号不稳定的情况下,或者在基站数目较少的情况下,仍然可以进行定位操作。仿真结果表明,使用不同网络的基站参与定位,提高了定位成功的可能性。在非视距和多径环境下,本方案运算量较小,实现相对简单,且精度较高,尤其是算法改进后定位误差可减小一倍以上,提高了定位结果的可靠性。
Aiming at the problem that UE positioning under a single network can not meet the positioning needs of users, an OTDOA positioning scheme is proposed in a heterogeneous network in which LTE, WCDMA and TD-SCDMA multi-base station coexist. In this scheme, the position and coordinates are firstly calculated by residual plus weight, and then an improved localization algorithm based on Chan algorithm and Taylor series algorithm is used to calculate the position. In the ideal channel environment and the typical channel model, heterogeneous networks Under the positioning simulation. In the case of unstable LTE network signals or in the case of a small number of base stations, the positioning operation can still be performed. The simulation results show that the base stations using different networks participate in the positioning and improve the possibility of positioning success. In non-line-of-sight and multi-path environments, the proposed method has a small computation load, relatively simple implementation and high accuracy. In particular, the positioning error can be reduced by more than double after the algorithm is improved, and the reliability of the positioning result is improved.