Doa Resolution Enhancement of Coherent Signals Via Spatial Averaging of Virtually Expanded Arrays

The virtual expansion method of the array aperture was suggested in order to improve the direction-of-arrival (DOA) resolution of coherent signals. But the virtual expansion of a single array has an inherent limit to improve the DOA resolution capability due to spurious peaks at the spatial spectrum. To overcome the limit of this method, the spatial spectrum averaging method of the virtually expanded arrays is proposed. From the simulation results for coherent signals impinging on an uniform circular array, the perfect DOA resolution capability of 100% is achieved at the SNR of more than −5 dB by the Deterministic Maximum Likelihood (DML) algorithm including the proposed method. Meanwhile, the DOA resolution capability of the standard DML algorithm is less than 11% at the SNR of more than −5 dB.

[1]  Hing Cheung So,et al.  Fast and Accurate Direction-of-Arrival Estimation for a Single Source , 2009 .

[2]  S.H. Zainud-Deen,et al.  Direction of arrival and state of polarization estimation using Radial Basis Function Neural Network (RBFNN) , 2008, 2008 National Radio Science Conference.

[3]  Xiaofei Zhang,et al.  BLIND DIRECTION OF ARRIVAL ESTIMATION OF COHERENT SOURCES USING MULTI-INVARIANCE PROPERTY , 2008 .

[4]  Dazhuan Xu,et al.  NOVEL BLIND JOINT DIRECTION OF ARRIVAL AND FREQUENCY ESTIMATION FOR UNIFORM LINEAR ARRAY , 2008 .

[5]  Xiaofei Zhang,et al.  NOVEL BLIND JOINT DIRECTION OF ARRIVAL AND POLARIZATION ESTIMATION FOR POLARIZATION-SENSITIVE UNIFORM CIRCULAR ARRAY , 2008 .

[6]  G.-M. Park,et al.  Resolution Enhancement of Coherence Sources Impinge on a Uniform Circular Array with Array Expansion , 2007 .

[7]  Ali Gharsallah,et al.  Direction of Arrival Estimation Method Using a 2-L Shape Arrays Antenna , 2007 .

[8]  Heung-Yong Kang.  DOA Resolution Enhancement of Incoherent Sources Using Virtual Expansion of Antenna Arrays , 2004 .

[9]  Young-Su Kim,et al.  Improved resolution capability via virtual expansion of array , 1999 .

[10]  M. Viberg,et al.  Two decades of array signal processing research: the parametric approach , 1996, IEEE Signal Process. Mag..

[11]  James A. Cadzow,et al.  General direction-of-arrival estimation: a signal subspace approach , 1989 .

[12]  Hong Wang,et al.  Coherent signal-subspace processing for the detection and estimation of angles of arrival of multiple wide-band sources , 1985, IEEE Trans. Acoust. Speech Signal Process..