J Shanghai Jiaotong Univ Sci ›› 2023, Vol. 28 ›› Issue (6): 763-771.doi: 10.1007/s12204-022-2464-z

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  1. (上海师范大学 信息与机电工程学院;上海智能教育与大数据工程研究中心,上海200234)
  • 接受日期:2021-10-18 出版日期:2023-11-28 发布日期:2023-12-04

Off-Grid Sparse Bayesian Inference with Biased Total Grids for Dense Time Delay Estimation

WEI Shuang (魏爽), LI Wenyao (李文瑶),SU Ying* (苏颖), LIU Rui (刘睿)   

  1. (College of Information, Mechanical and Electrical Engineering; Shanghai Engineering Research Center of Intelligent Education and Bigdata, Shanghai Normal University, Shanghai 200234, China)
  • Accepted:2021-10-18 Online:2023-11-28 Published:2023-12-04

摘要: 对于密集时延估计,当多个真实时延都位于一个网格间隔内时,现有的稀疏贝叶斯学习/推理方法很难获得较高估计精度以满足应用要求。为了解决这个问题,本文提出一种称为偏移全网格的离格稀疏贝叶斯推理方法,此方法进行网格演进,根据离格在两个网格之间的位置迭代移动总网格。所提出的方法通过进一步重构最优网格并偏移离格向量来更新离格字典矩阵。实验结果表明:即使网格间隔大于真实时延间隙,该方法也比其他最先进的稀疏贝叶斯推理方法和多信号分类方法性能好。另外本文研究了时延估计的时域模型和频域模型。

关键词: 离格,稀疏贝叶斯推理,时延估计,偏移全网格

Abstract: For dense time delay estimation (TDE), when multiple time delays are located within a grid interval, it is difficult for the existing sparse Bayesian learning/inference (SBL/SBI) methods to obtain high estimation accuracy to meet the application requirements. To solve this problem, this paper proposes a method named off-grid sparse Bayesian inference - biased total grid (OGSBI-BTG), where a mesh evolution process is conducted to move the total grids iteratively based on the position of the off-grid between two grids. The proposed method updates the off-grid dictionary matrix by further reconstructing an optimum mesh and offsetting the off-grid vector. Experimental results demonstrate that the proposed approach performs better than other state-of-the-art SBI methods and multiple signal classification even when the grid interval is larger than the gap of true time delays. In this paper, the time domain model and frequency domain model of TDE are studied.

Key words: off-grid, sparse Bayesian inference (SBI), time delay estimation (TDE), biased total grids (BTG)