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Parametric estimation technique for deterministic space-time signals on the output of linear sensor array in the presence of Gaussian noise with unknown second moment is considered. For this scenario, the derived maximum-likelihood statistics becomes invariant with respect to the second moment of noise and can be termed as blind estimator. Proposed technique was experimentally examined via estimation of track parameters for moving scatterer. It was shown for numerous records that the blind and model-based estimation techniques have close performance, however, blind estimator does not require preliminary investigation of interference and designing of its statistical model.