Off‐grid DoA estimation method of wideband signals,International Journal of Communication Systems

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Off‐grid DoA estimation method of wideband signals
International Journal of Communication Systems ( IF 1.7 ) Pub Date : 2020-07-19 , DOI: 10.1002/dac.4466
Yasoub Eghbali ₁ , Mahmoud Ferdosizade Naeiny ₁

Affiliation

In this paper, an off‐grid direction of arrival (DoA) estimation method is proposed for wideband signals. This method is based on the sparse representation (SR) of the array covariance matrix. Similar to the time domain DoA estimation methods, the correlation function of the sources was assumed to be the same and known. A new measurement vector is obtained using the lower‐left triangular elements of the covariance matrix. The DoAs are estimated by quantizing the entire range of continuous angle space into discrete grid points. However, the exact DoAs may be located between two grid points; therefore, this estimation has errors. The accuracy of DoA estimation is improved by the minimization of the difference between the new measurement vector and its estimated values. Simulation results revealed that the proposed method can enhance the DoA estimation accuracy of wideband signals.

中文翻译：

宽带信号的离网DoA估计方法

本文提出了一种宽带信号的离网到达方向（DoA）估计方法。此方法基于数组协方差矩阵的稀疏表示（SR）。与时域DoA估计方法类似，假定源的相关函数相同且已知。使用协方差矩阵的左下三角元素可以获得新的测量向量。通过将连续角度空间的整个范围量化为离散的网格点来估计DoAs。但是，确切的DoA可能位于两个网格点之间；因此，该估计有误差。通过最小化新测量向量及其估计值之间的差异，可以提高DoA估计的准确性。

更新日期：2020-07-19

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