METHOD DETERMINING PARAMETERS OF MOVEMENT OF MANEUVERING OBJECT Russian patent published in 2003 - IPC

FIELD: underwater acoustics, determination of parameters of movement of object approaching observer over curvilinear trajectory. SUBSTANCE: proposed method is based on reception of acoustic noise signal of maneuvering object approaching moving observer over trajectory on which its velocity vector is continuously directed on observer by observer's sonar antenna, on conversion of acoustic noise signal to electric signal, on automatic angle tracking of maneuvering object, on its classification and successive measurement of relative bearings P₁, P₂,...P_i on to maneuvering object in specified time intervals t_i, on determination of own movement velocity V_ob of observer from array of velocities of object of class according to which maneuvering object is classified, on selection of one possible value of velocity V_o of maneuvering object, on computation of initial value D₁ of range and present value D_i, of range, on calculation of relative bearing P_cal.i, per i-th time moment, on comparison of values P_i and P_cal.i. If difference modulus |(P_i-P_cal.i)| is equal or greater than specified value then selected velocity V_o of maneuvering object and computed range D_i to it are considered true. In case of other result of comparison another value of velocity of maneuvering object is chosen and computation procedure is repeated till condition specified for difference modulus of computed and measured values of relative bearings is fulfilled. EFFECT: possibility of sonar operation under passive mode without execution of own maneuver of sonar carrier. 1 dwg