Abstract
The problem of estimating the time-of-arrival (TOA) of a known signal
in the presence of interferences and multipath propagation is addressed.
This problem is essential in high precision receivers of the Global
Navigation Satellite Systems. This paper presents the maximum likelihood
TOA estimator when an antenna array is used in the receiver. The
desired signal impinges the array with a known direction-of-arrival
(DOA) vector, which allows to model all the undesired signal as unknown
and arbitrary spatially correlated noise. This simplified model makes
only the desired parameters remain in the formulation explicitly,
then avoiding complex maximization schemes needed by other models.
The fact that estimator is formulated in the frequency domain permits
the introduction of the temporal correlation of the noise. Simulation
results illustrate the satisfactory performance of the estimator.
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