We obtain an unbiased estimate method for direction to the source of radiation with minimum variance in conditions of a linear array antenna correlation interference from an unknown distribution function. Meeting the challenge of minimizing the variance and to obtain unbiased estimates are based on the Gauss-Markov theorem. The model of the formation of a discrete space-time signal in the form of a generalized vector. Based on analysis of Cramer-Rao inequality rating direction is produced by the harmonic expansion in the spatial coordinate, which allows for assessment without the formation of the traditional directional characteristics. Formed and presented the implementation of an algorithm derived method.