中文摘要：

对TD-SCDMA系统中的多基站定位方法进行了研究，提出了一种利用TD-SCDMA物理层帧结构中的下行同步序列进行定位的OTDOA-IPDL定位方法。该方法针对OTDOA定位方法中移动终端不能够准确地检测到非服务基站的信号，提出基于TD-SCDMA系统的IPDL技术，保证移动终端能够准确检测到非服务基站发送的下行同步信号，提高定位精度。在此重点描述了TD-SCDMA系统中的IPDL技术，并通过仿真验证所提方法的定位性能，说明IPDL技术在多基站定位中的重要性。

英文摘要：

The multi-BS positioning method for TD-SCDMA systems is studied in this paper. The OTDOA-IPDL（observed time difference of arrival-idle period downlink）poisoning method based on the synchronous downlink（SYNC-DL）sequence in TD-SCDMA physical layer frame structure is proposed,which can effectively help the mobiles detect the signals of non-service base stations （BS）. The IPDL technology introduced into TD-SCDMA systems can improve the positioning performance. IPDL technology of TD-SCDMA system is elaborated emphatically. The positioning performance of OTDOA-IPDL was validated by simulation. The simulation results show the importance of IPDL in multi-BS positioning.