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Off-Grid Sparse Bayesian Inference with Biased Total Grids for Dense Time Delay Estimation
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作者 魏爽 李文瑶 +1 位作者 苏颖 刘睿 《Journal of Shanghai Jiaotong university(Science)》 EI 2023年第6期763-771,共9页
For dense time delay estimation(TDE),when multiple time delays are located within a grid interval,it is dificult for the existing sparse Bayesian learning/inference(SBL/SBI)methods to obtain high estimation accuracy t... For dense time delay estimation(TDE),when multiple time delays are located within a grid interval,it is dificult 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. 展开更多
关键词 OFF-GRID sparse bayesian inference(SBI) time delay estimation(TDE) biased total grids(BTG)
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