Bearing estimation for a distributed source of nonconstant modulus ounds and analysis
2003
The paper considers the problem of estimating the bearing of a single, far-field source, surrounded by local scatterers, using passive
sensor arraymeasurements. An associated source-bearing estimation problem is formulated, and the Crame/spl acute/r-Rao lower bound is evaluated. In addition, a comprehensive analysis is performed of the
maximum likelihoodestimates that (due to mismodeling) assume a constant
modulussource, and the degradation in performance is quantified as a function of the source's empirical variance. It is shown that, for a
limited pricein terms of mean square error, the constant
modulus
maximum likelihoodestimator can replace the optimal nonconstant
modulusestimator.
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