电子学报2018，Vol.46Issue(6)：1281-1288,8.DOI:10.3969/j.issn.0372-2112.2018.06.001
同步时钟偏差存在下的时差定位性能分析及改进的定位方法
Performance Analysis and Improvement for TDOA Source Localization in the Presence of Synchronization Clock Bias
摘要
Abstract
Synchronization clock bias can significantly increase the localization errors. In order to solve this problem, this paper presents theoretical analysis and the improved method. First,the Cramér–Rao bound(CRB) on the parameter esti-mation is shown in the presence of synchronization clock bias. A more compact CRB expression for the source position estima-tion is obtained. Based on the maximum likelihood(ML)criterion and the Taylor series(TS) localization method,an analytical expression for the mean square error(MSE) of the source position estimation is also derived when the estimator assumes the clock bias does not exist. Subsequently,the localization method based on dimension-reduction TS iteration is presented and the closed-form ML solution for the clock bias is also given. Finally,numerical experimental results support the validation of the theoretical analysis,and also demonstrate that the proposed method can mitigate the effects of clock bias.关键词
无源定位/时差/同步时钟偏差/泰勒级数迭代/克拉美罗界Key words
passive location/time difference of arrival(TDOA)/synchronization clock bias/Taylor series(TS)itera-tion/Cramér-Rao bound(CRB)分类
信息技术与安全科学引用本文复制引用
王鼎,尹洁昕,刘瑞瑞,张博龙..同步时钟偏差存在下的时差定位性能分析及改进的定位方法[J].电子学报,2018,46(6):1281-1288,8.基金项目
国家自然科学基金(No.61201381,No.61401513,No.61772548) （No.61201381,No.61401513,No.61772548）
中国博士后科学基金(No.2016M592989) （No.2016M592989）
信息工程大学优秀青年基金(No.2016603201) （No.2016603201）
信息工程大学自主创新课题(No.2016600701) （No.2016600701）
某部内科研项目(No.2015201001,No.2015502801,No.2015205901) （No.2015201001,No.2015502801,No.2015205901）
