Signals phases difference on main frequency ω0 and with true direction φ can be found from the following formula: Difference in signals distribution paths lengths from emission source to DF antennas A1 and A2 Δ=dsinφ (pic.1) leads to received by antennas signals s1(t) and s2(t) phases difference. If distance between EO and DF base center is really high (R>d) EO emitted wave front next to DF antennas system can be considered as plane one. Phase method of direction finding based on phases difference of signals gotten by two equal antennas (A1 and A2 in the pic.1) spread on defined distance (base of d length). DFs have the following high requirements in their parameters: reaction speed (direction finding ability by the shortest signal realization – by one impulse in limit), direction finding accuracy, resolution ability. Difference in direction finding methods and DF types comes from technical features of this normal orientation setting. All of DFs (radio- technical radio-waves emitting or reflecting objects angle coordinates finders) and angle following radio-systems equalize signal coming direction with direction of normal to created by emission source wave front. Direction finders (DFs) are used for exploration objects (EO) space coordinates finding.
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