均勻圓陣相干信源DOA估計(jì)的模式平滑算法
MODE SPACE SMOOTHING ALGORITHM FOR DOA ESTIMATION OF COHERENT SOURCES WITH UNIFORM CIRCULAR ARRAY
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摘要: 本文提出了一種適用于均勻圓陣的相干信源空間譜估計(jì)的方法。它利用空間預(yù)處理技術(shù),將陣元空間的均勻圓陣變換成相位模式空間內(nèi)的虛擬均勻線陣。通過將均勻線陣的空間平滑技術(shù)和增強(qiáng)平滑技術(shù)應(yīng)用于該虛擬陣,可獲得文中的模式平滑算法。該算法僅利用一維搜索就可使均勻圓陣具有檢測相干信源的能力,避免了將圓陣看成是一般平面陣時所必須的多維搜索,減少了計(jì)算量。計(jì)算機(jī)模擬結(jié)果證明了該算法的正確性和有效性。
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關(guān)鍵詞:
- 模式空間; 虛擬線陣; 空間平滑
Abstract: A novel method to estimate DOAs of coherent sources impinging on an uniform circular array(UCA) is presented in this paper. A virtual uniform linear array(VULA) is first derived by DFT preprocessing, transforming the UCA from element space to phase mode space which is special for circular arrays, and then the well-known spatial smoothing technique is applied to the VULA so that the decreased rank of covariance matrix due to coherence can be retrieved. Simulation results have strongly verified the effectiveness of the algorithm. -
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