FIELD: underwater navigation; ultrashort base sonar navigation systems of high accuracy for support of self-contained and tethered vehicles or other underwater equipment. SUBSTANCE: proposed direction finder has antenna with circular base with equidistant N receiving units, N-channel phase meter, N- channel amplitude meter, computer, N-channel signal-to-noise ratio meter, phasing unit and relative bearing computer. N-channel meters form signal parameter meter. Phasing unit input is connected with phase and amplitude N-channel meters and output of phasing unit is connected with third input of relative bearing computer. First N- channel input of relative bearing computer is connected with output of N-channel phase meter and second N-channel input is connected with output of N-channel signal-to-noise ratio meter. Distance between receiving units of antenna is selected from range of 0.5 to 3 length of navigation frequency waves. Used as initial estimate of relative bearing are output data of phasing unit; relative bearing is found by solving equation relating the antenna configuration with parameters of signal received. EFFECT: enhanced accuracy of estimation of relative bearing. 2 dwg
