A Comparison of Two Stochastic Maximum Likelihood DoA Estimators – Rotating Array Case
Michał Meller, Kamil Stawiarski · 2020
The accuracy of two variants of stochastic maximum likelihood direction of arrival estimators is compared under the assumptions of a rotating array and two sources. The difference between the estimators lies in how they approach the source correlation. One estimator treats sources as uncorrelated, while the other includes the source correlation coefficient as a parameter to be estimated. Analytic formulas for the mean squared error (MSE), worst-case MSE, and average MSE of both estimators are derived and verified using computer simulations. The simpler estimator is shown to be competitive to the more complex one for small and moderate levels of source correlation.