Asymptotic Covariance Matrices of Estimation Error: Effects of Temporal Phase Difference
Cam V. Tran · 2005
Cramkr-Rao Bound, asymptotic MUSIC and ML variances corresponding to the two-source direction-of-arrival estimation where sources are modeled as deterministic, narrowband, plane waves impinging on a uniform linear array. The choice of the center of the array as the coordinate reference results in compact expressions that greatly facilitate our study of effects of temporal phase difference (correlation phase) of the two sources on asymptotic variances of estimation error. These effects are intensified when the two signals are closely spaced and/or when their normalized correlation magnitude is high. Numerical examples obtained from specializing general formulas agree with our results. We obtain closed-form expressions for the