A DOA Estimation Algorithm Based on Matrix Tri-diagonal Decomposition
Xue Feng-feng · Telecommunication Engineering · 2012
The direction of arrival(DOA) estimation performance declines in low signal-to-noise ratio(SNR).According to the array covariance matrix conjugate symmetrical characteristic,tri-diagonal decomposition based on Givens transformation is adopted to three diagonalize covariance matrix,at the same time the cover′s round recursive method is used to estimate signal subspace of rank accurately,and then diagonalize the three diagonal matrix,estimate the noise subspace,and utilize the orthogonal of noise subspace and wire vector to realize DOA estimation.The estimation error and robustness under the low SNR condition are improved.Computer simulation proves the efficiency of the method.