基于時頻子空間分解的寬帶線性調(diào)頻信號DOA估計
DOA Estimation of Wideband Chirp Signals Based on Time-Frequency Subspace Decomposition
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摘要: 針對具有時變方向向量的寬帶線性調(diào)頻信號,該文建立了基于短時Wigner-Ville分布(WVD)的空間時頻分布矩陣,通過對各個空間時頻矩陣的特征分解獲得對應的信號子空間和噪聲子空間,給出了基于時頻子空間投影實現(xiàn)多個時頻點綜合估計信號DOA的算法。利用空間時頻分布的前后向平滑解決了具有相同時頻特性信號的均勻線陣DOA估計問題。算法不需要聚匯和插值等復雜的矩陣變換,精度較高,計算簡便.仿真實驗顯示該算法性能顯著優(yōu)越于基于矩陣插值的寬帶調(diào)頻信號DOA估計算法.Abstract: In allusion to wideband chirp signals with time-varying direction vector, this paper constructs STFD(Spatial Time-Frequency Distribution) by short WVD(Wigner-Ville Distribution). By eigenvalue decomposition to get signal subspace and noise subspace, a algorithm of DOA estimation based on time-frequency subspace projection is proposed . Through spatial smoothing, the problem of DOA estimation of signals with the same time-frequency signature is solved. This method need not focusing and interpolation, has high precision and low computation. Simulation shows the algorithm has better performance than the method of DOA estimation of wideband signals based on matrix interpolation proposed recently.
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Amin M G. Spatial time-frequency distributions for direction finding and blind source separation[J].in Proc. SPIE.1999, vol.3723:62-70[2]Gershman A B, Amin M G. Wideband direction of arrival estimation of multiple chirp signals using spatial time-frequency distributions[J].IEEE Signal Processing Lett.2000, 7(6):152-155[3]Huang Ke-ji, Tian Da, Chen Tian-qi. Direction-of-arrival estimation of wideband chirp signals using the Wigner ditribution of symmetrical sensor array. ICCCAS02, Chengdu, 2002: 1025-1028. -
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