V.N. Tyapkin - Ph.D. (Eng.), Associate Professor, Siberian Federal University (SFU), Professor of Military Engineering Institute, Krasnoyarsk. E-mail: tyapkin58@mail.ru
D.D. Dmitriev - Ph.D. (Eng.), Siberian federal university (SFU), Associate Professor of Military Engineering Institute, Krasnoyarsk. E-mail: dmitriev121074@mail.ru
Yu.L. Fateev - Dr. Sc.(Eng.), Associate Professor, Siberian Federal University (SFU), Professor of Military Engineering Institute, Krasnoyarsk. E-mail: fateev_yury@inbox.ru
A.N. Fomin - Ph.D. (Eng.), Associate Professor, Siberian Federal University (SFU), Professor of Military Engineering Institute, Krasnoyarsk. E-mail: fomin.@bk.ru

Modern electronic systems, including navigation equipment and consumer satellite navigation systems GLONASS/GPS are increasingly equipped with phased arrays. Application of phased array antennas can improve immunity and measurement accuracy of the navigation parameters in the navigation equipment. Furthermore, phased arrays allow find direction, ie, determining the angular coordinates of the signal sources. Increasing the accuracy of direction finding possible by increasing the number of elements of the phased array antenna and the relationship d/λ, where the first path increases the size of the phased array antenna and complicates its construction, and the second path leads to the need to resolve of phase ambiguity measurements. In order to increase the accuracy of the methods used in direction finding adaptation mode the phased array. Simplification of treatment possible in the application in order to adapt the algorithms based on partial representation of the amplitude distribution of the Fourier series. Mathematical modeling, the possibility of direction-finding signal sources using adaptive algorithm, in which the amplitude distribution is a partial Fourier series with two members without appreciable deterioration DF sensitivity. This can significantly reduce the performance requirements for DF processor.