Off-Grid DOA Estimation for Colocated MIMO Radar via Reduced-Complexity Sparse Bayesian Learning

Off-Grid DOA Estimation for Colocated MIMO Radar via Reduced-Complexity Sparse Bayesian Learning
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通过降低复杂度的稀疏贝叶斯学习对共置 MIMO 雷达进行离网 DOA 估计

DOI:
10.1109/access.2019.2930531
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发表时间:
2019-07
期刊:
影响因子:
3.9
通讯作者:
Ke Wang
Ke Wang
中科院分区:
计算机科学3区
文献类型:
--
作者:
Tingting Liu;Fangqing Wen;Lei Zhang;Ke Wang

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信号处理的最新进展见证了人们对机器学习的兴趣日益浓厚。在本文中,我们从机器学习的角度重新审视共置多输入多输出(MIMO)雷达的到达方向(DOA)估计问题。首先对来自匹配滤波器的阵列数据应用降低复杂度的变换,从而消除阵列数据的冗余以减轻计算负担。此外,进行预白化以获得简化的噪声模型。最后,DOA估计与离网稀疏贝叶斯学习(OGSBL)相联系,不需要更新噪声超参数,并利用块超参数来加速OGSBL算法的收敛。所提出的估计器比现有的峰值搜索算法提供更好的 DOA 估计精度。通过数值仿真验证了所提算法的有效性。
Recent advance on signal processing has witnessed increasing interest in machine learning. In this paper, we revisit the problem of direction-of-arrival (DOA) estimation for colocated multiple-input multiple-output (MIMO) radar from the perspective of machine learning. The reduced-complexity transformation is first applied on the array data from matched filters, thus eliminating the redundancy of the array data for the relief of calculational burden. Furthermore, the pre-whitening is followed to obtain a simplified noise model. Finally, the DOA estimation is linked to off-grid sparse Bayesian learning (OGSBL), which does not require to update the noise hyper-parameter, and a block hyper-parameter is utilized to accelerate the convergence of the OGSBL algorithm. The proposed estimator provides better DOA estimation accuracy than the existing peak searching algorithm. The effectiveness of the proposed algorithm is verified via numerical simulation.
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