计算机工程与应用 ›› 2007, Vol. 43 ›› Issue (34): 239-242.

• 工程与应用 • 上一篇    下一篇

对高速运动辐射源的实时高精度时差估计方法

汪立新1,2,林孝焰1,2,吴 涛2   

  1. 1.通信系统信息控制技术国家级重点实验室,浙江 嘉兴 314001
    2.杭州电子科技大学 电子与信息系统研究所,杭州 310018
  • 收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:2007-12-01 发布日期:2007-12-01
  • 通讯作者: 汪立新

Real-time & high accuracy TDOA estimation method for tracking fast moving target

WANG Li-xin1,2,LIN Xiao-yan1,2,WU Tao2   

  1. 1.National Laboratory of Information Control Technology for Communication System,Jiaxing,Zhejiang 314001,China
    2.Institute of Electronic & Information System,Hangzhou Dianzi University,Hangzhou 310018,China
  • Received:1900-01-01 Revised:1900-01-01 Online:2007-12-01 Published:2007-12-01
  • Contact: WANG Li-xin

摘要: 在无源时差定位中,要求能实时获得目标到达测量站的TDOA参数,传统的互相关法需要大数据量、大运算量以及数据块处理,难以提取快速时变参数。提出了一种基于同伦延拓EKF的新方法,收敛速度快,估计精度达到CRLB下限,对每一个新的数据样点可直接更新TDOA参数,克服了一般EKF法中初始估计误差过大将导致滤波发散的问题。

关键词: 时差估计, 互相关, 信号模型, 同伦延拓EKF

Abstract: TDOA estimation is very important in case of multi-station passive location,but the traditional co-correlation method is difficult to be used to track fast moving target because of non real-time,high computation cost and lower accuracy.This paper proposes a new method based on Homotopy Continuation Extended Kalman Filter(HCEKF),which be used to quickly converge to CRLB in performance.In the new approach,the TDOA parameter is updated along with a new observation,and the phenomena of non-convergence in general EKF is eliminated when initial state estimation be not closed to true parameter.

Key words: TDOA estimation, co-correlation, signal model, HCEKF