METHOD ESTABLISHING POSITIONS OF MOBILE GROUND OBJECTS AND FACILITY FOR ITS REALIZATION Russian patent published in 2004 - IPC

FIELD: measurement technology, instruments establishing coordinates of mobile ground objects. SUBSTANCE: control values of horizontal projections of summary intensity vector of magnetic field of the Earth and magnetic field of object are measured in the course of calibration cycle. Hodograph coefficients of correction of horizontal component of magnetic field are found by these data. Averaged values of projections of gravity acceleration and projections of summary intensity vector of magnetic field of the Earth and of magnetic field of object on axis of instrument coordinate system are measured in the course of working cycle. Then values of horizontal projections of intensity vector of magnetic field of the Earth on axis of horizontal system of coordinates of object are determined with due account of correction coefficients generated during calibration cycle. Angle of direction of motion is found and increments of coordinates in process of working cycle are established with allowance for path increment. Coordinates of object are calculated with due account of coordinates of initial point. Averaged values of two projections of summary intensity vector of magnetic field of the Earth and magnetic field of object on axis of instrument coordinate system are taken in each working cycle as averaged values of projections of summary intensity vector of magnetic field of the Earth and magnetic field of object. Control values of horizontal projections of intensity vector of magnetic field of the Earth are measured during motion. Hodograph coefficients of correction of horizontal component of magnetic field generated during calibration cycle are defined more exactly. Values of gravity acceleration measured along longitudinal axis of mobile object are corrected during motion with allowance for changes of path increments in the course of several working cycles. Facility for establishment of positions of mobile ground objects incorporates two sensors of magnetic field, vertical transmitters coming in the form of linear acceleration transducers, displacement transducer, converting and averaging unit, unit computing horizontal projections of magnetic field, first and second units calculating correction coefficients of magnetic field, unit of correction of magnetic field, navigation unit, control unit, control desk, indication unit, unit of control values of horizontal projections of magnetic field of the Earth, unit computing longitudinal acceleration and unit of acceleration correction. Above-mentioned units are properly connected. EFFECT: increased precision of measurement of coordinates and angle of direction of motion of object. 2 cl, 2 dwg